JP6851882B2 - Manufacturing method of Calcia modified soil - Google Patents
Manufacturing method of Calcia modified soil Download PDFInfo
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本発明は、浚渫土と製鋼スラグから形成されたカルシア改質材の混合物であるカルシア改質土の製造方法に関し、さらに詳しくは、所望の一軸圧縮強さを有するカルシア改質土をより確実に製造することができるカルシア改質土の製造方法に関するものである。 The present invention relates to a method for producing a calcia-modified soil, which is a mixture of a dredged soil and a calcia-modified material formed from steelmaking slag. It relates to a method for producing modified calcia soil that can be produced.
浚渫土を強度改良する改質材として、鉄鋼精製の過程で副産物として生じる製鋼スラグから形成されたカルシア改質材が使用されている。浚渫土にカルシア改質材を混合して製造されたカルシア改質土は、浅場や干潟、藻場などの造成材料として活用される（例えば、特許文献１参照）。 As a modifier for improving the strength of dredged soil, a calcia modifier formed from steelmaking slag produced as a by-product in the process of steel refining is used. The calcia-modified soil produced by mixing dredged soil with a calcia-modified material is utilized as a material for creating shallow fields, tidal flats, seaweed beds, etc. (see, for example, Patent Document 1).
従来、浚渫土とカルシア改質材とを概略的な目安の体積混合比（例えば、泥土：カルシア改質材＝７：３）で混合することにより、カルシア改質土を製造している。しかしながら、このような体積混合比を浚渫土の性状が異なる場合にも適用しているため、製造されたカルシア改質土の強度（一軸圧縮強さ）にバラツキが生じている。そのため、より品質の安定したカルシア改質土を製造するには改善の余地がある。 Conventionally, a dredged soil and a calcia modified material are mixed at a roughly standard volume mixing ratio (for example, mud: calcia modified material = 7: 3) to produce a calcia modified soil. However, since such a volume mixing ratio is applied even when the properties of the dredged soil are different, the strength (uniaxial compressive strength) of the produced Calcia modified soil varies. Therefore, there is room for improvement in producing more stable quality Calcia modified soil.
本発明は、上記の状況を鑑みてなされたものであり、その目的は、所望の一軸圧縮強さを有するカルシア改質土をより確実に製造することができるカルシア改質土の製造方法を提供することにある。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for producing a calcia-modified soil capable of more reliably producing a calcia-modified soil having a desired uniaxial compressive strength. To do.
上記目的を達成するため、本発明のカルシア改質土の製造方法は、浚渫土とカルシア改質材とを混合して、所望の一軸圧縮強さを有するカルシア改質土を製造するカルシア改質土の製造方法であって、カルシア改質土に含まれる水分とカルシア改質材との質量比率を水カルシア比とし、現場で使用する浚渫土および所定の仕様のカルシア改質材で作製したカルシア改質土について一軸圧縮試験を行うことにより、前記水カルシア比と、カルシア改質土の一軸圧縮強さとの相関関係を予め把握しておき、この相関関係と、所望の一軸圧縮強さとに基づいて、この所望の一軸圧縮強さを得るために必要な前記水カルシア比の許容範囲を決定し、混合する浚渫土および前記所定の仕様のカルシア改質材に含まれている水分とこのカルシア改質材との質量比率を現場水カルシア比とし、この現場水カルシア比を前記許容範囲内にしてカルシア改質土を製造するに際して、前記混合する浚渫土の単位体積当たりの水分の質量を、その浚渫土の湿潤密度、土粒子密度および水密度に基づいて算出し、前記土粒子密度および水密度には予め把握されている範囲内での所定値を用い、算出した前記混合する浚渫土の単位体積当たりの水分の質量と前記許容範囲の水カルシア比とに基づいて、前記混合する浚渫土の単位体積当たりの前記所定の仕様のカルシア改質材の混合質量を算出し、算出した前記混合質量とこのカルシア改質材の表乾密度とに基づいて、製造するカルシア改質土の単位体積当たりのこのカルシア改質材の体積混合比率を算出して、前記表乾密度には予め把握している値を使用し、現場では算出した前記体積混合比率で前記浚渫土とこのカルシア改質材とを混合することを特徴とする。 In order to achieve the above object, the method for producing a calcia-modified soil of the present invention is a calcia-modified soil in which a dredged soil and a calcia-modified material are mixed to produce a calcia-modified soil having a desired uniaxial compressive strength. A method of producing soil, in which the mass ratio of water contained in the calcia-modified soil to the calcia-modified material is defined as the water-calcia ratio, and the dredged soil used in the field and the calcia-modified material of the specified specifications are used for the calcia. By conducting a uniaxial compression test on the modified soil, the correlation between the water calcia ratio and the uniaxial compressive strength of the calcia modified soil is grasped in advance, and based on this correlation and the desired uniaxial compressive strength. The allowable range of the water calcia ratio required to obtain this desired uniaxial compressive strength is determined, and the water content contained in the drenched soil to be mixed and the calcia modifier of the predetermined specifications and this calcia modification are obtained. When the calcia modified soil is produced by setting the mass ratio with the pawn material to the in-situ water calcia ratio and keeping this in-situ water calcia ratio within the permissible range, the mass of water per unit volume of the drenched soil to be mixed is determined. Calculated based on the wet density, soil particle density, and water density of the dredged soil, and the soil particle density and water density are calculated using predetermined values within a range known in advance, and the unit of the drenched soil to be mixed is calculated. Based on the mass of water per volume and the water calcia ratio within the permissible range, the mixed mass of the calcia modifier of the predetermined specifications per unit volume of the drenched soil to be mixed is calculated, and the calculated mixed mass is calculated. Based on this and the surface dry density of this Calcia modifier, the volume mixing ratio of this Calcia modifier per unit volume of the Calcia modified soil to be produced is calculated, and the surface dry density is grasped in advance. It is characterized in that the drenched soil and the calcia modifier are mixed at the calculated volume mixing ratio in the field using the above values.
本発明によれば、水カルシア比とカルシア改質土の一軸圧縮強さとの相関関係を予め把握しておくことで、その相関関係と所望の一軸圧縮強さとに基づいて、所望の一軸圧縮強さを有するカルシア改質土を製造するのに必要な水カルシア比の許容範囲を精度よく決定できる。そして、現場カルシア比を決定した許容範囲内にして浚渫土とカルシア改質材とを混合することで、所望の一軸圧縮強さを有するカルシア改質土をより確実に製造することができる。これにより、品質のバラツキを小さくしてカルシア改質土を製造することが可能となる。前記混合する浚渫土の単位体積当たりの水分の質量は、例えば、その浚渫土の湿潤密度、土粒子密度および水密度に基づいて算出する。 According to the present invention, by grasping the correlation between the water calcia ratio and the uniaxial compressive strength of the calcia modified soil in advance, the desired uniaxial compressive strength is based on the correlation and the desired uniaxial compressive strength. It is possible to accurately determine the permissible range of the water-calcia ratio required to produce the calcia-modified soil having a compressive strength. Then, by mixing the dredged soil and the calcia modifier with the on-site calcia ratio within the determined allowable range, the calcia modified soil having a desired uniaxial compressive strength can be produced more reliably. This makes it possible to produce Calcia modified soil with less variation in quality. The mass of water per unit volume of the dredged soil to be mixed is calculated based on, for example, the wet density, soil particle density and water density of the dredged soil.
前記水カルシア比毎に、前記現場水カルシア比を前記許容範囲内にするために必要となる前記カルシア改質土の単位体積当たりの前記カルシア改質材の体積混合比率と、前記混合する浚渫土の湿潤密度との相関関係を予め把握しておき、この相関関係と、前記混合する浚渫土の湿潤密度とに基づいて決定した前記体積混合比率で前記浚渫土と前記カルシア改質材とを混合することもできる。水カルシア比毎に、カルシア改質材の体積混合比率と、混合する浚渫土の湿潤密度との相関関係を予め把握しておくと、所望の一軸圧縮強さに基づいて水カルシア比の許容範囲を決定し、混合する浚渫土の湿潤密度を測定するだけで、所望の一軸圧縮強さを有するカルシア改質土を製造するのに必要なカルシア改質材の体積混合比率を決定できる。作業が簡便化するので、カルシア改質土の製造効率を大幅に向上させることができる。 For each water calcia ratio, the volume mixing ratio of the calcia reforming material per unit volume of the calcia reforming soil required to keep the in-situ water calcia ratio within the permissible range, and the dredging soil to be mixed. The correlation with the wet density of the above is grasped in advance, and the dredged soil and the calcia modifier are mixed at the volume mixing ratio determined based on this correlation and the wet density of the dredged soil to be mixed. You can also do it. For each water-calcia ratio, if the correlation between the volume mixing ratio of the calcia modifier and the wet density of the dredged soil to be mixed is known in advance, the allowable range of the water-calcia ratio is based on the desired uniaxial compressive strength. The volumetric mixing ratio of the calcia-modified material required to produce the calcia-modified soil having the desired uniaxial compressive strength can be determined only by determining the wet density of the dredged soil to be mixed. Since the work is simplified, the production efficiency of the modified Calcia soil can be significantly improved.
製造したカルシア改質土の湿潤密度を測定し、この測定した湿潤密度と予め把握している混合した前記浚渫土の湿潤密度および前記カルシア改質材の表乾密度とに基づいて、製造したカルシア改質土の単位体積当たりの前記カルシア改質材の体積混合比率を算出し、算出したこの体積混合比率と、このカルシア改質土を製造した際の前記カルシア改質土の単位体積当たりの前記カルシア改質材の体積混合比率とを比較するとよい。製造したカルシア改質土の湿潤密度を測定して算出したカルシア改質材の体積混合比率と、製造した際のカルシア改質材の体積混合比率とを比較することで、カルシア改質土を製造する過程で不具合の有無を把握できる。これにより、製造したカルシア改質土の品質を厳しくチェックできるので品質の安定したカルシア改質土を製造するには益々有利になる。 The wet density of the produced Calcia modified soil is measured, and the produced Calcia is based on the measured wet density, the wet density of the mixed dredged soil and the surface dry density of the Calcia modified material, which are known in advance. The volume mixing ratio of the Calcia modified material per unit volume of the modified soil was calculated, and the calculated volume mixing ratio and the said volume per unit volume of the Calcia modified soil when the Calcia modified soil was produced. It is good to compare with the volume mixing ratio of the calcia modifier. The Calcia modified soil is produced by comparing the volume mixing ratio of the Calcia modified material calculated by measuring the wet density of the produced Calcia modified soil with the volume mixing ratio of the Calcia modified material at the time of production. You can grasp the presence or absence of defects in the process of doing. As a result, the quality of the produced Calcia modified soil can be strictly checked, which is more advantageous for producing stable quality Calcia modified soil.
以下、本発明のカルシア改質土の製造方法を図に示した実施形態に基づいて説明する。 Hereinafter, the method for producing the modified soil of Calcia of the present invention will be described based on the embodiment shown in the figure.
図１に例示するように、本発明では、浚渫土Ｓとカルシア改質材Ｃとを混合することにより、所望の一軸圧縮強さを有するカルシア改質土Ｐを製造する。この実施形態では、バックホウ１により浚渫土Ｓとカルシア改質材Ｃとを撹拌混合してカルシア改質土Ｐを製造している。
As illustrated in FIG. 1, in the present invention, the dredged soil S and the calcia modified material C are mixed to produce a calcia modified soil P having a desired uniaxial compressive strength. In this embodiment, the dredged soil S and the calcia reforming material C are stirred and mixed by the
浚渫土Ｓとカルシア改質材Ｃとの混合は、バックホウ１ではなく、ミキサーなどの混合機等を使用して行うこともできる。また、浚渫土Ｓとカルシア改質材Ｃの他に必要に応じて他の部材を少量混合することもできる。カルシア改質材Ｃは、高炉で製造された銑鉄を転炉で精錬する工程で生成される製鋼スラグを成分管理、粒度調整した材料である。カルシア改質材の主成分は、石灰、二酸化珪素、酸化鉄である。
The dredging soil S and the calcia modifier C can be mixed by using a mixer such as a mixer instead of the
本発明では、カルシア改質土Ｐに含まれる水分とカルシア改質材Ｃとの質量比率を水カルシア比Ｘａとする。また、現場において混合する浚渫土Ｓおよびカルシア改質材Ｃに含まれている水分とカルシア改質材Ｃとの質量比率を現場水カルシア比Ｘｂとする。この実施形態では、水カルシア比Ｘａおよび現場水カルシア比Ｘｂとして、カルシア改質土Ｐ（浚渫土Ｓおよびカルシア改質材Ｃ）に含まれる水分の質量をカルシア改質材Ｃの質量で除した値を採用している。 In the present invention, the mass ratio of the water contained in the calcia-modified soil P to the calcia-modified material C is defined as the water-calcia ratio Xa. Further, the mass ratio of the water contained in the dredged soil S and the calcia modifier C mixed at the site to the calcia modifier C is defined as the site water calcia ratio Xb. In this embodiment, the mass of water contained in the calcia modified soil P (dredged soil S and the calcia reforming material C) is divided by the mass of the calcia reforming material C as the water calcia ratio Xa and the in-situ water calcia ratio Xb. The value is adopted.
尚、水カルシア比Ｘａおよび現場水カルシア比Ｘｂには、カルシア改質材Ｃの質量をカルシア改質土Ｐに含まれる水分の質量で除した値を採用することもできる。その場合には、以下で説明する水カルシア比Ｘａおよび現場水カルシア比Ｘｂをそれぞれ逆数として扱うことで同様の結果を得ることができる。 For the water-calcia ratio Xa and the in-situ water-calcia ratio Xb, values obtained by dividing the mass of the calcia reforming material C by the mass of water contained in the calcia-modified soil P can also be adopted. In that case, the same result can be obtained by treating the water-calcia ratio Xa and the in-situ water-calcia ratio Xb described below as reciprocals.
本発明者らは、様々な性状の浚渫土Ｓとカルシア改質材Ｃとの配合試験を重ねた結果、図２に示すように、カルシア改質土Ｐの一軸圧縮強さｑｕと水カルシア比Ｘａとの間に高い相関関係があることを知得した。図２のグラフ縦軸はカルシア改質土Ｐの一軸圧縮強さｑｕを対数目盛で示し、グラフ横軸は水カルシア比Ｘａを示している。 As a result of repeated compounding tests of dredged soil S and calcia modifier C having various properties, the present inventors have shown that as shown in FIG. 2, the uniaxial compressive strength qu of calcia modified soil P and the water-calcia ratio. I learned that there is a high correlation with Xa. The vertical axis of the graph in FIG. 2 shows the uniaxial compressive strength qu of the calcia modified soil P on a logarithmic scale, and the horizontal axis of the graph shows the water calcia ratio Xa.
本発明では、このカルシア改質土Ｐの一軸圧縮強さｑｕと水カルシア比Ｘａとの相関関係を利用して、カルシア改質土Ｐの製造を行う。本発明の製造方法の手順は図３に例示するフロー図のとおりである。 In the present invention, the calcia modified soil P is produced by utilizing the correlation between the uniaxial compressive strength qu of the calcia modified soil P and the water calcia ratio Xa. The procedure of the manufacturing method of the present invention is as shown in the flow chart illustrated in FIG.
本発明では予め、現場で使用する浚渫土および所定の仕様のカルシア改質材Ｃで作製したカルシア改質土について、水カルシア比Ｘａとカルシア改質土Ｐの一軸圧縮強さｑｕとの相関関係を把握する。水カルシア比Ｘａとカルシア改質土Ｐの一軸圧縮強さｑｕとの相関関係は、浚渫土Ｓとカルシア改質材Ｃとの配合試験（一軸圧縮試験）を行ない、図２に示すように、その試験結果をグラフ化することで把握できる。この水カルシア比Ｘａとカルシア改質土Ｐの一軸圧縮強さｑｕとの相関関係は、様々な現場において汎用的に使用できる。 In the present invention, there is a correlation between the water-calcia ratio Xa and the uniaxial compressive strength qu of the calcia-modified soil P for the dredged soil used in the field and the calcia-modified soil prepared with the calcia-modified material C having predetermined specifications. To grasp. The correlation between the water calcia ratio Xa and the uniaxial compressive strength qu of the calcia modified soil P was obtained by conducting a compounding test (uniaxial compression test) between the dredged soil S and the calcia modified material C, and as shown in FIG. It can be grasped by graphing the test results. This correlation between the water calcia ratio Xa and the uniaxial compressive strength qu of the calcia modified soil P can be used universally in various fields.
カルシア改質土Ｐを製造する際には、この予め把握しておいた相関関係と、カルシア改質土Ｐに望まれる一軸圧縮強さｑｕとに基づいて、この所望の一軸圧縮強さｑｕを得るために必要な水カルシア比Ｘａの許容範囲を決定する。 When producing the Calcia modified soil P, the desired uniaxial compressive strength qu is obtained based on the correlation previously grasped and the uniaxial compressive strength qu desired for the Calcia modified soil P. Determine the permissible range of water calcia ratio Xa required to obtain.
例えば、所望の一軸圧縮強さｑｕが２４ｋＮ／ｍ２である場合には、図２を参照して、一軸圧縮強さｑｕが２４ｋＮ／ｍ２を満足するような水カルシア比Ｘａの許容範囲を決定する。この実施形態の場合には、水カルシア比Ｘａの許容範囲を例えば、４５％〜５０％と決定する。 For example, when the desired uniaxial compressive strength qu is 24 kN / m 2 , the permissible range of the water calcia ratio Xa such that the uniaxial compressive strength qu satisfies 24 kN / m 2 is set with reference to FIG. decide. In the case of this embodiment, the permissible range of the water calcia ratio Xa is determined to be, for example, 45% to 50%.
そして、カルシア改質土Ｐを製造する現場では、現場水カルシア比Ｘｂを、決定した水カルシア比Ｘａの許容範囲内にしてカルシア改質土Ｐを製造する。この実施形態の場合には、現場水カルシア比Ｘｂが４５％〜５０％になるように浚渫土Ｓとカルシア改質材Ｃとを混合する。 Then, at the site where the calcia modified soil P is produced, the calcia modified soil P is produced with the on-site water calcia ratio Xb within the allowable range of the determined water calcia ratio Xa. In the case of this embodiment, the dredged soil S and the calcia modifier C are mixed so that the on-site water calcia ratio Xb is 45% to 50%.
現場水カルシア比Ｘｂを決定した許容範囲内にするために必要となる、カルシア改質土Ｐの単位体積当たりのカルシア改質材Ｃの体積混合比率Ａｍは、以下の手順で算出することができる。 The volume mixing ratio Am of the calcia modifier C per unit volume of the calcia reformed soil P, which is required to keep the on-site water calcia ratio Xb within the determined allowable range, can be calculated by the following procedure. ..
まず、浚渫土Ｓが飽和（間隙が水で飽和）しているとし、混合する浚渫土Ｓの単位体積あたりの質量を示す湿潤密度ρｍ（ｇ／ｃｍ３）を測定し、この測定した浚渫土Ｓの湿潤密度ρｍと、浚渫土Ｓの土粒子密度ρｓ（ｇ／ｃｍ３）と、浚渫土Ｓが含む水（海水）の密度ρｗ（ｇ／ｃｍ３）とを下記（１）式に代入することにより、混合する浚渫土Ｓの含水比Ｗｍ（％）を算出する。
尚、浚渫土Ｓの土粒子密度ρｓは、浚渫された場所や土の種類によらず概ね２．６０ｇ／ｃｍ3〜２．７０ｇ／ｃｍ3であるので、浚渫土Ｓの土粒子密度ρｓは例えば、２．６５ｇ／ｃｍ3として計算することができる。同様に、浚渫土Ｓが含む水の密度ρｗは概ね１．０２ｇ／ｃｍ3〜１．０４ｇ／ｃｍ3であるので、水の密度ρｗは例えば、１．０３ｇ／ｃｍ３として計算することができる。 Incidentally, the soil particle density ρs of dredged soil S is because it is generally 2.60g / cm 3 ~2.70g / cm 3, regardless of the type of dredging locations and soil, the soil particle density ρs of dredged soil S is For example, it can be calculated as 2.65 g / cm 3. Similarly, the density ρw water dredged material S comprises the generally is 1.02g / cm 3 ~1.04g / cm 3 , the density of water ρw, for example, can be calculated as 1.03 g / cm @ 3.
次いで、（１）式で算出した浚渫土Ｓの含水比率Ｗｍを下記（２）式に代入することにより、浚渫土Ｓの単位体積当たりの水分の質量Ｗｗ（ｔ／ｍ３）を算出する。
そして、（２）式で算出した浚渫土Ｓの単位体積当たりの水分の質量Ｗｗと水カルシア比Ｘａとを下記（３）式に代入することにより、単位体積当りの浚渫土Ｓに対するカルシア改質材Ｃの混合質量Ｗｃ（ｔ／ｍ３）を算出する。
次いで、（３）式で算出した単位体積当りの浚渫土Ｓに対するカルシア改質材Ｃの混合質量Ｗｃとカルシア改質材Ｃの表乾密度ρｃ（ｔ／ｍ３）とを下記（４）式に代入することにより、カルシア改質土Ｐの単位体積当たりのカルシア改質材Ｃの体積混合比率Ａｍ（％）を算出する。
上述した手順で、決定した水カルシア比Ｘａの許容範囲の上限（例えば、５０％）と下限（例えば、４５％）についてそれぞれカルシア改質材Ｃの体積混合比率Ａｍを算出することで、現場水カルシア比Ｘｂを許容範囲内にするために必要となるカルシア改質材Ｃの体積混合比率Ａｍの許容範囲を算出することができる。現場では、カルシア改質土Ｐの単位体積当たりのカルシア改質材Ｃの体積混合比率Ａｍが、この算出した許容範囲内になるように浚渫土Ｓとカルシア改質材Ｃとを混合する。 By calculating the volume mixing ratio Am of the calcia modifier C for each of the upper limit (for example, 50%) and the lower limit (for example, 45%) of the allowable range of the water calcia ratio Xa determined by the above procedure, the on-site water It is possible to calculate the permissible range of the volume mixing ratio Am of the calcia modifier C required to keep the calcia ratio Xb within the permissible range. At the site, the dredged soil S and the calcia reforming material C are mixed so that the volume mixing ratio Am of the calcia reforming material C per unit volume of the calcia modified soil P is within the calculated allowable range.
このように本発明では、水カルシア比Ｘａとカルシア改質土Ｐの一軸圧縮強さｑｕとの相関関係を予め把握しておくことで、その相関関係と所望の一軸圧縮強さｑｕとに基づいて、所望の一軸圧縮強さｑｕを有するカルシア改質土Ｐを製造するのに必要な水カルシア比Ｘａの許容範囲を精度よく決定できる。そして、現場カルシア比Ｘｂを決定した許容範囲内して浚渫土Ｓとカルシア改質材Ｃとを混合することで、所望の一軸圧縮強さｑｕを有するカルシア改質土Ｐをより確実に製造することができる。これにより、品質のバラツキを小さくしてカルシア改質土Ｐを製造することが可能となる。 As described above, in the present invention, by grasping the correlation between the water calcia ratio Xa and the uniaxial compressive strength qu of the calcia modified soil P in advance, the correlation is based on the desired uniaxial compressive strength qua. Therefore, the permissible range of the water-calcia ratio Xa required for producing the calcia-modified soil P having the desired uniaxial compressive strength qu can be accurately determined. Then, by mixing the dredged soil S and the calcia modifier C within the permissible range in which the on-site calcia ratio Xb is determined, the calcia modified soil P having a desired uniaxial compressive strength qu is more reliably produced. be able to. This makes it possible to produce Calcia modified soil P with less variation in quality.
上記の（１）式〜（４）式により、質量比率である現場水カルシア比Ｘｂ（水カルシア比Ｘａ）をカルシア改質材Ｃの体積混合比率Ａｍに置き換えると、カルシア改質材Ｃの計量作業が行い易くなるので、カルシア改質土Ｐの製造効率を向上させるには有利になる。 When the in-situ water calcia ratio Xb (water calcia ratio Xa), which is the mass ratio, is replaced with the volume mixing ratio Am of the calcia modifier C according to the above equations (1) to (4), the measurement of the calcia modifier C is performed. Since the work becomes easier, it is advantageous for improving the production efficiency of the calcia modified soil P.
上記の（１）式〜（４）式の変数は、水カルシア比Ｘａと、カルシア改質材Ｃの体積混合比率Ａｍと、混合する浚渫土Ｓの湿潤密度ρｍである。それ故、図４に示すように、上記の（１）式〜（４）式は、式を整理することで、水カルシア比Ｘａ毎のカルシア改質材Ｃの体積混合比率Ａｍと混合する浚渫土Ｓの湿潤密度ρｍとの相関関係としてグラフ化することもできる。 The variables of the above equations (1) to (4) are the water calcia ratio Xa, the volume mixing ratio Am of the calcia modifier C, and the wet density ρm of the dredged soil S to be mixed. Therefore, as shown in FIG. 4, the above equations (1) to (4) are dredged to be mixed with the volume mixing ratio Am of the calcia modifier C for each water calcia ratio Xa by rearranging the equations. It can also be graphed as a correlation with the wet density ρm of soil S.
図４のグラフ縦軸はカルシア改質材Ｃの体積混合比率Ａｍを示しており、グラフ横軸は浚渫土Ｓの湿潤密度ρｍを示している。グラフ上の直線Ａ、Ｂ、Ｃ、Ｄ、Ｅ、Ｆは、それぞれ水カルシア比Ｘａを４０％、４５％、５０％、５５％、６０％、６５％とする場合のカルシア改質材Ｃの体積混合比率Ａｍと浚渫土Ｓの湿潤密度ρｍとの相関関係を示している。 The vertical axis of the graph in FIG. 4 shows the volume mixing ratio Am of the calcia modifier C, and the horizontal axis of the graph shows the wet density ρm of the dredged soil S. The straight lines A, B, C, D, E, and F on the graph are the Calcia modifier C when the water calcia ratio Xa is 40%, 45%, 50%, 55%, 60%, and 65%, respectively. The correlation between the volume mixing ratio Am and the wet density ρm of the dredged soil S is shown.
このように、水カルシア比Ｘａ毎に、カルシア改質材Ｃの体積混合比率Ａｍと、混合する浚渫土Ｓの湿潤密度ρｍとの相関関係を予め把握しておくと、所望の一軸圧縮強さｑｕに基づいて水カルシア比Ｘａの許容範囲を決定し、混合する浚渫土Ｓの湿潤密度ρｍを測定するだけで、図４のグラフ図を参照して、所望の一軸圧縮強さｑｕを有するカルシア改質土Ｐを製造するのに必要なカルシア改質材Ｃの体積混合比率Ａｍを決定することが可能となる。 In this way, if the correlation between the volume mixing ratio Am of the calcia modifier C and the wet density ρm of the drowned soil S to be mixed is grasped in advance for each water calcia ratio Xa, the desired uniaxial compressive strength can be obtained. The allowable range of the water calcia ratio Xa is determined based on qu, and the wet density ρm of the dredged soil S to be mixed is simply measured. It is possible to determine the volume mixing ratio Am of the calcia modifier C required for producing the modified soil P.
また、水カルシア比Ｘａとカルシア改質土Ｐの一軸圧縮強さｑｕには高い相関関係があるので、一軸圧縮強さｑｕの異なるカルシア改質土Ｐを製造する場合にも、図４のグラフ図を参照してそれぞれの一軸圧縮強さｑｕに相当する水カルシア比Ｘａを選択することで、それぞれの一軸圧縮強さｑｕに合ったカルシア改質材Ｃの体積混合比率Ａｍを容易に決定することが可能となる。 Further, since there is a high correlation between the water calcia ratio Xa and the uniaxial compressive strength qu of the calcia modified soil P, the graph of FIG. 4 is also used when producing the calcia modified soil P having different uniaxial compressive strength qu. By selecting the water calcia ratio Xa corresponding to each uniaxial compressive strength qu with reference to the figure, the volume mixing ratio Am of the calcia modifier C corresponding to each uniaxial compressive strength qua can be easily determined. It becomes possible.
図２と図４に示すような２つのグラフ図を予め用意しておけば、現場においては、混合する浚渫土Ｓの湿潤密度ρｍを測定するだけで、所望の一軸圧縮強さｑｕを有するカルシア改質土Ｐを製造するのに適したカルシア改質材Ｃの体積混合率Ａｍの許容範囲を容易に少ない工数で把握することが可能となる。それ故、作業が簡便化するので、カルシア改質土Ｐの製造効率を大幅に向上させることができる。 If two graphs as shown in FIGS. 2 and 4 are prepared in advance, in the field, only by measuring the wet density ρm of the dredged soil S to be mixed, the calcia having the desired uniaxial compressive strength qu can be obtained. It is possible to easily grasp the permissible range of the volume mixing ratio Am of the calcia modifier C suitable for producing the modified soil P with a small number of man-hours. Therefore, since the work is simplified, the production efficiency of the calcia modified soil P can be significantly improved.
浚渫土Ｓとカルシア改質材Ｃとを混合した後には、製造したカルシア改質土Ｐの単位体積当たりのカルシア改質材Ｃの体積混合比率Ａｔと、カルシア改質土Ｐを製造した際のカルシア改質土Ｐの単位体積当たりのカルシア改質材Ｃの体積混合比率Ａｍとを比較することで製造したカルシア改質土Ｐの品質を確認する。この工程は任意であるが実施することが好ましい。 After mixing the dredged soil S and the calcia modified soil C, the volume mixing ratio At of the calcia modified material C per unit volume of the produced calcia modified soil P and the volume mixing ratio At when the calcia modified soil P was produced and the calcia modified soil P were produced. The quality of the produced Calcia modified soil P is confirmed by comparing the volume mixing ratio Am of the Calcia modified material C per unit volume of the Calcia modified soil P. This step is optional but preferably carried out.
製造したカルシア改質材Ｃの体積混合比率Ａｔは、製造したカルシア改質土Ｐの湿潤密度ρｔを測定し、この測定した湿潤密度ρｔと予め把握している混合した浚渫土Ｓの湿潤密度ρｍおよびカルシア改質材Ｃの表乾密度ρｃとに基づいて下記（５）式により、算出することができる。
浚渫土Ｓとカルシア改質材Ｃとが決定した現場水カルシア比Ｘｂの許容範囲内で適切に混合された場合には、製造したカルシア改質土Ｐの単位体積当たりのカルシア改質材Ｃの体積混合比率Ａｔは、製造した際のカルシア改質材Ｃの体積混合比率Ａｍの許容範囲内の数値となる。一方で、製造後のカルシア改質材Ｃの体積混合比率Ａｔが、製造した際のカルシア改質材Ｃの体積混合比率Ａｍの許容範囲を外れた数値となった場合には、計量作業や混合作業に不具合があり、製造したカルシア改質土Ｐが所望の一軸圧縮強さｑｕを満足していない可能性がある。 When the dredged soil S and the calcia reforming material C are appropriately mixed within the allowable range of the on-site water calcia ratio Xb determined, the calcia reforming material C per unit volume of the produced calcia reforming soil P The volume mixing ratio At is a value within the permissible range of the volume mixing ratio Am of the calcia modifier C at the time of production. On the other hand, if the volume mixing ratio At of the calcia modifier C after production is out of the permissible range of the volume mixing ratio Am of the calcia modifier C at the time of production, the weighing work or mixing is performed. There is a possibility that the work is defective and the produced Calcia modified soil P does not satisfy the desired uniaxial compressive strength qu.
このように、製造したカルシア改質土Ｐの湿潤密度ρｔを測定して算出したカルシア改質材Ｃの体積混合比率Ａｔと、製造した際のカルシア改質材Ｃの体積混合比率Ａｍとを比較することで、カルシア改質土Ｐを製造する過程で不具合の有無を把握できる。これにより、製造したカルシア改質土Ｐの品質を厳しくチェックできるので品質の安定したカルシア改質土Ｐを製造するには益々有利になる。 In this way, the volume mixing ratio At of the calcia modifier C calculated by measuring the wet density ρt of the produced calcia modified soil P is compared with the volume mixing ratio Am of the calcia modifier C at the time of production. By doing so, it is possible to grasp the presence or absence of defects in the process of producing the calcia modified soil P. As a result, the quality of the produced Calcia modified soil P can be strictly checked, which is more advantageous for producing the Calcia modified soil P having stable quality.
１ バックホウ
Ｓ 浚渫土
Ｃ カルシア改質材
Ｐ カルシア改質土
1 Backhoe S Dredged soil C Calcia modified material P Calcia modified soil
Claims (3)
カルシア改質土に含まれる水分とカルシア改質材との質量比率を水カルシア比とし、現場で使用する浚渫土および所定の仕様のカルシア改質材で作製したカルシア改質土について一軸圧縮試験を行うことにより、前記水カルシア比と、カルシア改質土の一軸圧縮強さとの相関関係を予め把握しておき、この相関関係と、所望の一軸圧縮強さとに基づいて、この所望の一軸圧縮強さを得るために必要な前記水カルシア比の許容範囲を決定し、混合する浚渫土および前記所定の仕様のカルシア改質材に含まれている水分とこのカルシア改質材との質量比率を現場水カルシア比とし、この現場水カルシア比を前記許容範囲内にしてカルシア改質土を製造するに際して、前記混合する浚渫土の単位体積当たりの水分の質量を、その浚渫土の湿潤密度、土粒子密度および水密度に基づいて算出し、前記土粒子密度および水密度には予め把握されている範囲内での所定値を用い、算出した前記混合する浚渫土の単位体積当たりの水分の質量と前記許容範囲の水カルシア比とに基づいて、前記混合する浚渫土の単位体積当たりの前記所定の仕様のカルシア改質材の混合質量を算出し、算出した前記混合質量とこのカルシア改質材の表乾密度とに基づいて、製造するカルシア改質土の単位体積当たりのこのカルシア改質材の体積混合比率を算出して、前記表乾密度には予め把握している値を使用し、現場では算出した前記体積混合比率で前記浚渫土とこのカルシア改質材とを混合することを特徴とするカルシア改質土の製造方法。 A method for producing a calcia-modified soil, which comprises mixing a dredged soil and a calcia-modified material to produce a calcia-modified soil having a desired uniaxial compressive strength.
A uniaxial compression test was conducted on the dredged soil used in the field and the Calcia modified soil prepared with the Calcia modified material of the specified specifications, using the mass ratio of the water contained in the Calcia modified soil and the Calcia modified material as the water Calcia ratio. By doing so, the correlation between the water-calcia ratio and the uniaxial compression strength of the calcia-modified soil is grasped in advance, and the desired uniaxial compression strength is based on this correlation and the desired uniaxial compression strength. Determine the permissible range of the water calcia ratio required to obtain the water, and determine the mass ratio of the water contained in the dredged soil to be mixed and the calcia modifier of the predetermined specifications to the calcia modifier in the field. When the calcia-modified soil is produced by setting the water-calcia ratio and the on-site water-calcia ratio within the permissible range, the mass of water per unit volume of the drenched soil to be mixed is determined by the wet density of the drenched soil and the soil particles. Calculated based on the density and water density, using predetermined values within the range known in advance for the soil particle density and water density, the calculated mass of water per unit volume of the mixed dredged soil and the above. Based on the water calcia ratio within the permissible range, the mixed mass of the calcia modifier of the predetermined specifications per unit volume of the drenched soil to be mixed was calculated, and the calculated mixed mass and the table of the calcia modifier. Based on the dry density, the volume mixing ratio of this calcia modifier per unit volume of the calcia modified soil to be produced is calculated, and the value known in advance is used for the surface dry density, and the value is used in the field. A method for producing a calcia-modified soil, which comprises mixing the dredged soil with the calcia-modified material at the calculated volume mixing ratio.
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