JP7717469B2 - A method for estimating the likelihood of poor mixing due to co-rotation phenomena during ground improvement - Google Patents
A method for estimating the likelihood of poor mixing due to co-rotation phenomena during ground improvementInfo
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Description
本発明は、地盤改良のための機械撹拌工法において共回り現象による混合不良発生の可能性の高低を推定する技術に関する。 The present invention relates to a technique for estimating the likelihood of poor mixing due to the co-rotation phenomenon occurring in a mechanical mixing method for ground improvement.
地盤改良を実施する際に、よく行われる工法の１つに機械撹拌工法がある。これは、撹拌翼を地盤中で回転させることにより、固化材と土とを撹拌混合し、固結体を地中内に造成する工法である。この工法における課題の１つに、共回り現象がある。共回り現象とは、撹拌翼に土が付着し、撹拌翼と土とが一体となって回転する現象である。これにより、固化材と土との混合不良が発生し、地盤改良に際して混合不良をきたす場合がある。そこで、前記の共回り現象発生可能性を配合試験段階で事前予測し、前記現象の発生を抑制する方法が提案されている（例えば、特許文献１参照）。 Mechanical mixing is one of the most common methods used in ground improvement work. This involves rotating a mixing blade in the ground to mix and stir the solidification material and soil, creating a solidified mass underground. One of the issues with this method is the phenomenon of co-rotation. This occurs when soil adheres to the mixing blade, causing the blade and soil to rotate together. This can lead to poor mixing of the solidification material and soil, resulting in poor mixing during ground improvement work. Therefore, a method has been proposed to predict the possibility of this co-rotation occurring during the mix testing stage and prevent it from occurring (see, for example, Patent Document 1).
しかし、現状では、高塑性の混合対象土で共回りが発生しやすく、混合不良となる可能性が大きいという傾向がわかっているものの、それ以外の発生条件が明らかになっていない。 However, at present, although it is known that co-rotation is more likely to occur in highly plastic soils to be mixed, which increases the likelihood of poor mixing, other conditions for this occurrence have not yet been clarified.
そこで、本発明は、共回り現象による混合不良発生の可能性の高低を推定可能な方法を提供することを目的とする。 Therefore, an object of the present invention is to provide a method capable of estimating the likelihood of poor mixing occurring due to the co-rotation phenomenon.
本発明の共回り現象による混合不良発生の可能性の高低の推定方法は、
地盤改良のための機械撹拌工法において混合不良発生の可能性の高低を推定する方法であって、
試料としての対象土に対して撹拌翼機構を回転させながら貫入した後、前記試料から前記撹拌翼機構を回転させながら引き抜く工程と、
前記試料から引き抜かれた前記撹拌翼機構に対する付着対象土量を計測し、前記試料から引き抜かれた前記撹拌翼機構に対する付着対象土量と、当該対象土の含水比または液性指数との相関関係を定め、当該相関関係に基づき、前記試料から引き抜かれた前記撹拌翼機構に対する付着対象土量が閾値以上になる含水比または液性指数の範囲から前記可能性の高低を推定する工程と、を含んでいる。
The method of estimating the likelihood of poor mixing occurring due to the co-rotation phenomenon of the present invention is as follows:
A method for estimating the likelihood of poor mixing occurring in a mechanical mixing method for ground improvement,
a step of rotating an agitating blade mechanism while penetrating the target soil as a sample, and then rotating and withdrawing the agitating blade mechanism from the sample;
The method includes a step of measuring the amount of soil to be attached to the agitator blade mechanism extracted from the sample, determining a correlation between the amount of soil to be attached to the agitator blade mechanism extracted from the sample and the moisture content or liquid index of the target soil, and estimating the level of the possibility based on the correlation from the range of moisture content or liquid index within which the amount of soil to be attached to the agitator blade mechanism extracted from the sample is equal to or greater than a threshold value .
含水比を変化させた対象土に対して、撹拌翼機構を回転させながら貫入・引き抜きを行い、引き抜き後に撹拌翼に付着した対象土の質量（付着対象土量）を計量することにより、共回り現象による混合不良発生の可能性の高低を判断する。 The target soil with different moisture contents is penetrated and pulled out while the mixing blade mechanism is rotated, and the mass of the target soil attached to the mixing blade after the removal (amount of attached target soil) is measured to determine the likelihood of poor mixing due to the co-rotation phenomenon .
例えば、図１に示されているように、撹拌翼機構１は、略角柱状の支柱１０と、当該支柱１０の対向する一対の側面のそれぞれに対して、水平面に傾斜して取り付けられた対をなす撹拌翼１２と、により構成されている。支柱１０は、電動モータなどのアクチュエータにより軸線まわりに回動可能に構成されている。図１に示されているように、３対の撹拌翼１２が、支柱１０の軸線方向（鉛直方向）に間隔を存して配置され、軸線方向に沿った順で各対の撹拌翼１２が上面視で位相が相互に９０°ずつずらされて支柱１０に対して取り付けられている。 For example, as shown in FIG. 1, the agitator blade mechanism 1 is composed of a generally rectangular pillar 10 and a pair of agitator blades 12 attached to each of a pair of opposing side surfaces of the pillar 10 at an angle to the horizontal. The pillar 10 is configured to be rotatable about its axis by an actuator such as an electric motor. As shown in FIG. 1, three pairs of agitator blades 12 are arranged at intervals in the axial direction (vertical direction) of the pillar 10, and each pair of agitator blades 12 is attached to the pillar 10 in order along the axial direction with their phases shifted by 90° from each other when viewed from above.
カオリン、現場対象土、および、乾燥カオリンと自然含水比の現場対象土とが質量比１：１で混合された混合対象土が試料として用いられた。表１には、各試料の土質特性が示されている。 The samples used were kaolin, in-situ target soil, and a mixed target soil consisting of dry kaolin and in-situ target soil with a natural moisture content in a 1:1 mass ratio. Table 1 shows the soil properties of each sample.
貫入実験は、バケツに入れた対象土に対して、撹拌翼機構１を軸線まわりに回転させながら貫入することにより実施された。 The penetration experiment was conducted by penetrating the target soil placed in a bucket while rotating the mixing blade mechanism 1 around its axis.
１分後、撹拌翼機構１を軸線まわりに回転させながら、軸線方向に引き抜き、撹拌翼１２（および支柱１０）に付着した対象土が除去され、当該対象土の質量が計測された。撹拌翼機構１の回転速度が２０ｒｐｍおよび４０ｒｐｍのそれぞれに調節された場合について実験が実施された。撹拌翼機構１の貫入速度および引き抜き速度は１０ｃｍ／ｍｉｎに制御された。 After one minute, the agitator blade mechanism 1 was rotated around its axis while being withdrawn in the axial direction, the target soil adhering to the agitator blade 12 (and support 10) was removed, and the mass of the target soil was measured. Experiments were conducted with the rotation speed of the agitator blade mechanism 1 adjusted to both 20 rpm and 40 rpm. The penetration and withdrawal speeds of the agitator blade mechanism 1 were controlled to 10 cm/min.
液性落下試験は、撹拌後の試料について、液性限界試験（ＪＩＳ Ａ １２０５）と同様の手順で実験を行い、対象土の溝が約１．５ｃｍ閉じたときの落下回数が測定された。なお、この液性限界試験は「フォールコーンを用いた土の液性限界試験方法（地盤工学会基準 ＪＧＳ ０１４２－２００９）」によってもよい。 The liquid drop test was conducted on the mixed sample using the same procedure as the liquid limit test (JIS A 1205), measuring the number of times the sample fell when the trench in the target soil was closed approximately 1.5 cm. This liquid limit test can also be conducted in accordance with the "Liquid Limit Test Method for Soil Using a Fall Cone (Geotechnical Society Standard JGS 0142-2009)."
ベーン試験（地盤工学会基準 ＪＧＳ１４１１－２０１２）は、試料の撹拌後にバケツの中にベーンが貫入されて行われた。 The vane test (Geotechnical Society standard JGS1411-2012) was performed by inserting a vane into the bucket after stirring the sample.
図２Ａには、撹拌翼機構１の回転速度が２０ｒｐｍに制御された場合の各試料の含水比と付着対象土量との関係が示されている。図２Ｂには、撹拌翼機構１の回転速度が４０ｒｐｍに制御された場合の各試料の含水比と付着対象土量との関係が示されている。図２Ａおよび図２Ｂから、ある含水比で付着対象土量が最大値を示すこと、ひいては、最も対象土が付着しやすい、すなわち、共回り現象が発生しやすい含水比が試料ごとに存在することがわかる。 Figure 2A shows the relationship between the moisture content of each sample and the amount of soil to be attached when the rotation speed of the agitator blade mechanism 1 is controlled to 20 rpm. Figure 2B shows the relationship between the moisture content of each sample and the amount of soil to be attached when the rotation speed of the agitator blade mechanism 1 is controlled to 40 rpm. Figures 2A and 2B show that the amount of soil to be attached reaches a maximum value at a certain moisture content, and therefore that there is a moisture content for each sample at which the soil is most likely to adhere, i.e., at which the co-rotation phenomenon is most likely to occur.
例えば、図２Ａおよび図２Ｂに示されている、試料から引き抜かれた撹拌翼機構１に付着している対象土の質量と、当該対象土の含水比との相関関係に基づき、当該質量が閾値以上になる含水比の範囲が、共回り現象の因子として推定される。閾値として、試料から引き抜かれた撹拌翼機構１に付着している対象土の質量の最大値の０．８５倍の値が用いられてもよい。 For example, based on the correlation between the mass of the target soil adhering to the mixing impeller mechanism 1 removed from the sample and the moisture content of the target soil shown in Figures 2A and 2B, the range of moisture content where the mass is equal to or greater than a threshold value is estimated as a factor in the co-rotation phenomenon. The threshold value may be 0.85 times the maximum mass of the target soil adhering to the mixing impeller mechanism 1 removed from the sample.
さらに、最大の付着対象土量を示す含水比は、表１に示された液性限界に近いことがわかる。そこで、対象土の含水比の液性限界に対する相関関係を考察するため、自然含水比ｗ、塑性限界ｗpおよび液性限界ｗLを用いて、関係式（１）で表わされる液性指数ＩLを採用する。 Furthermore, it can be seen that the water content that indicates the maximum amount of soil that can be adhered is close to the liquid limit shown in Table 1. Therefore, in order to consider the correlation between the water content of the target soil and the liquid limit, the liquid index I L expressed by the relational expression (1) is adopted using the natural water content w, the plastic limit w p and the liquid limit w L.
ＩL＝（ｗ－ｗp）／（ｗL－ｗP） ‥（１）。 I L = (w - w p )/(w L - w p ) (1).
図３Ａには、撹拌翼機構１の回転速度が２０ｒｐｍに制御された場合の各試料の液性指数ＩＬと付着対象土量との関係が示されている。図３Ｂには、撹拌翼機構１の回転速度が４０ｒｐｍに制御された場合の各試料の液性指数ＩＬと付着対象土量との関係が示されている。図３Ａおよび図３Ｂから、各試料について液性指数ＩＬが１．０付近で付着対象土量が最大値を示すことがわかる。 Figure 3A shows the relationship between the liquidity index IL and the amount of soil to be attached for each sample when the rotation speed of the agitating impeller mechanism 1 is controlled to 20 rpm. Figure 3B shows the relationship between the liquidity index IL and the amount of soil to be attached for each sample when the rotation speed of the agitating impeller mechanism 1 is controlled to 40 rpm. Figures 3A and 3B show that the amount of soil to be attached for each sample reaches its maximum value when the liquidity index IL is around 1.0.
例えば、図３Ａおよび図３Ｂに示されている、試料から引き抜かれた撹拌翼機構１に付着している対象土の質量と、当該対象土の液性指数ＩＬとの相関関係に基づき、当該質量が閾値以上になる含水比の範囲が、共回り現象の因子として推定される。閾値として、試料から引き抜かれた撹拌翼機構１に付着している対象土の質量の最大値の０．８５倍の値が用いられてもよい。 For example, based on the correlation between the mass of the target soil adhering to the mixing impeller mechanism 1 removed from the sample and the liquid index IL of the target soil, as shown in Figures 3A and 3B, the range of water content where the mass is equal to or greater than a threshold value is estimated as a factor in the co-rotation phenomenon. The threshold value may be 0.85 times the maximum mass of the target soil adhering to the mixing impeller mechanism 1 removed from the sample.
また、高塑性の対象土は共回り現象が発生しやすいという経験的知見から、図４には、試料の塑性指数とその試料の付着対象土量の最大値との相関関係が示されている。図４から、塑性指数が大きいほど最大付着対象土量が比例的に増加することがわかる。 Furthermore, based on the empirical finding that highly plastic target soils are prone to co-rotation, Figure 4 shows the correlation between the plasticity index of a sample and the maximum amount of soil that can be attached to that sample. Figure 4 shows that the higher the plasticity index, the proportionally higher the maximum amount of soil that can be attached.
対象土の塑性指数が大きいということは、撹拌翼機構１に対する当該対象土の付着量が大きいということであるから、対象土が撹拌翼機構１に付着して共回りを起こし、ひいては混合不良を引き起こす可能性が高い。よって、対象土の塑性指数を測定することによって、当該対象土が撹拌翼機構１に付着する質量を推定し、これによって共回り現象発生可能性、ひいては混合不良発生の可能性を推定することができる。 A high plasticity index for the target soil means that a large amount of that soil is adhering to the mixing impeller mechanism 1, which means that there is a high possibility that the target soil will adhere to the mixing impeller mechanism 1 and rotate together, resulting in poor mixing. Therefore, by measuring the plasticity index of the target soil, it is possible to estimate the mass of the target soil adhering to the mixing impeller mechanism 1, which in turn makes it possible to estimate the likelihood of the phenomenon of rotation together and therefore the likelihood of poor mixing.
（本発明の他の実施形態）
前記実施形態において、セメント系固化材が混合された混合対象土が試料として用いられ、当該試料から引き抜かれた撹拌翼機構１に付着している混合対象土の質量が用いられて共回り現象の可能性が推定されてもよい。前記実施形態と同様に、撹拌翼機構１に付着している混合対象土の質量と、当該混合対象土の含水比との相関関係に基づき、共回り現象の可能性が推定されてもよい（図２Ａおよび図２Ｂ参照）。前記実施形態と同様に、撹拌翼機構１に付着している混合対象土の質量と、当該混合対象土の液性指数との相関関係に基づき、共回り現象の可能性が推定されてもよい（図３Ａおよび図３Ｂ参照）。
(Another embodiment of the present invention)
In the above embodiment, the possibility of the co-rotation phenomenon may be estimated using the mass of the soil to be mixed adhering to the mixing impeller mechanism 1 extracted from the sample, as in the above embodiment. Similarly to the above embodiment, the possibility of the co-rotation phenomenon may be estimated based on the correlation between the mass of the soil to be mixed adhering to the mixing impeller mechanism 1 and the water content of the soil to be mixed (see FIGS. 2A and 2B). Similarly to the above embodiment, the possibility of the co-rotation phenomenon may be estimated based on the correlation between the mass of the soil to be mixed adhering to the mixing impeller mechanism 1 and the liquid index of the soil to be mixed (see FIGS. 3A and 3B).
試料から引き抜かれた撹拌翼機構１に付着している混合対象土の質量に加えて、セメント系固化材が土に混合されてからの経過時間に基づいて共回り現象の可能性が推定されてもよい。 In addition to the mass of the soil to be mixed adhering to the mixing blade mechanism 1 pulled out from the sample, the possibility of the co-rotation phenomenon may be estimated based on the elapsed time since the cement-based solidification material was mixed into the soil.
１‥攪拌翼機構、１０‥支柱、１２‥撹拌翼。 1. Mixing blade mechanism, 10. Support, 12. Mixing blade.
Claims (2)
試料としての対象土に対して撹拌翼機構を回転させながら貫入した後、前記試料から前記撹拌翼機構を回転させながら引き抜く工程と、
前記試料から引き抜かれた前記撹拌翼機構に対する付着対象土量を計測し、前記試料から引き抜かれた前記撹拌翼機構に対する付着対象土量と、当該対象土の含水比または液性指数との相関関係を定め、当該相関関係に基づき、前記試料から引き抜かれた前記撹拌翼機構に対する付着対象土量が閾値以上になる含水比または液性指数の範囲から前記可能性の高低を推定する工程と、を含んでいる方法。 A method for estimating the likelihood of poor mixing due to co-rotation phenomena in a mechanical mixing method for ground improvement,
a step of rotating an agitating blade mechanism while penetrating the target soil as a sample, and then rotating and withdrawing the agitating blade mechanism from the sample;
measuring the amount of soil to be attached to the agitator blade mechanism extracted from the sample, determining a correlation between the amount of soil to be attached to the agitator blade mechanism extracted from the sample and the moisture content or liquid index of the target soil, and estimating the level of the possibility based on the correlation from the range of moisture content or liquid index within which the amount of soil to be attached to the agitator blade mechanism extracted from the sample is equal to or greater than a threshold value .
セメント系固化材を含む土を前記対象土として用いて前記可能性の高低を推定する方法。 10. The method of claim 1 ,
A method for estimating the level of the possibility using soil containing cement-based solidification material as the target soil.
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| JP3042002U (en) | 1997-03-31 | 1997-10-07 | 株式会社オートセット | Underground ground improvement device with co-rotation prevention |
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