JP2016188524A - Method of producing improved soil, method of producing cement composition and method of designing proportion of improved soil ingredient - Google Patents
Method of producing improved soil, method of producing cement composition and method of designing proportion of improved soil ingredient Download PDFInfo
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Abstract
Description
本発明は、改良土の製造方法、セメント組成物の製造方法、及び、改良土の配合設計方法に関する。 The present invention relates to a method for producing improved soil, a method for producing a cement composition, and a method for blending and designing improved soil.
従来、構造物等の基礎となる地盤の強度を高めて地盤を改良するために、セメントを含有するセメント組成物を対象地盤の土壌に混合すること（改良土の作製）が行われている。 Conventionally, in order to improve the ground by increasing the strength of the ground serving as the foundation of a structure or the like, a cement composition containing cement is mixed with the soil of the target ground (production of improved soil).
土壌に混合するセメント組成物の量を多くすることで土壌の強度を高めることができるが、セメント組成物を必要以上に用いるとコストがかかってしまう。
そのようなことから、地盤の強度を目標強度以上にしつつセメント組成物の使用量を抑制するように、改良土の配合設計が行われている。
改良土の配合設計方法としては、地盤改良の対象となる地盤から土壌試料を採取し、異なる添加量でセメント組成物を土壌試料に混合して複数の供試体を作製し、所定材齢の供試体の強度を測定して、土壌へのセメント組成物の必要な添加量を求めることが行われている。
Although the strength of the soil can be increased by increasing the amount of the cement composition mixed with the soil, the use of the cement composition more than necessary increases the cost.
For this reason, blending design of improved soil has been carried out so as to suppress the amount of cement composition used while making the ground strength equal to or higher than the target strength.
As a method for designing improved soil, a soil sample is collected from the ground to be ground improved, and a plurality of specimens are prepared by mixing the cement composition with the soil sample at different addition amounts. The strength of the specimen is measured to determine the required amount of cement composition added to the soil.
しかし、このような方法では、強度を測定するための試験に手間がかかり、また、供試体を所定の材齢とするのに時間がかかるという問題もある。
このような問題に対し、地盤改良の対象となる地盤の土壌（以下、「対象土」ともいう。）の含水比、対象土中のビチューメン、フミン酸、フルボ酸、アロフェン、および、非晶質相（アロフェンを除く）の含有率を測定し、これらの測定値を使った改良土の配合設計方法が開示されている（例えば、特許文献１）。
However, in such a method, there is a problem that a test for measuring the strength takes time and it takes time to set the specimen to a predetermined age.
For such problems, the water content of the soil of the ground to be improved (hereinafter also referred to as “target soil”), bitumen, humic acid, fulvic acid, allophane, and amorphous in the target soil A method for blending and designing improved soil using the measured values of the phase (excluding allophane) is disclosed (for example, Patent Document 1).
しかしながら、特許文献１の方法では測定対象項目が多いため、より簡便に改良土の配合設計を行うことができる方法が望まれる。 However, since there are many items to be measured in the method of Patent Document 1, a method capable of more easily designing the improved soil is desired.
本発明は、上記要望点に鑑み、簡便に改良土の配合設計を行うことができる改良土の製造方法、セメント組成物の製造方法、及び、改良土の配合設計方法を提供することを課題とする。 An object of the present invention is to provide a method for producing an improved soil, a method for producing a cement composition, and a method for designing an improved soil, in which the improved soil can be simply designed in consideration of the above-mentioned requirements. To do.
本発明者らが鋭意研究したところ、対象土が火山灰質粘性土であれば、前記対象土の含水比と、前記対象土中のアロフェンの含有量とから改良土の配合を設計できることを見出し、本発明を想到するに至った。 As a result of intensive research by the present inventors, if the target soil is a volcanic ash clay, it has been found that the composition of the improved soil can be designed from the moisture content of the target soil and the content of allophane in the target soil, The present invention has been conceived.
本発明は、対象土と、セメントを含有するセメント組成物とが混合された改良土を作製する、改良土の製造方法であって、
前記対象土が、火山灰質粘性土であり、
前記対象土の含水比を測定する第一工程と、前記対象土中のアロフェンの含有量を測定する第二工程とを改良土の作製前に行い、改良土の配合を設計する、改良土の製造方法である。
The present invention is a method for producing an improved soil, which produces an improved soil in which a target soil and a cement composition containing cement are mixed,
The target soil is a volcanic ash clay soil,
The first step of measuring the moisture content of the target soil and the second step of measuring the allophane content in the target soil are performed before the preparation of the improved soil, and the composition of the improved soil is designed. It is a manufacturing method.
また、本発明は、対象土と、セメントを含有するセメント組成物とが混合された改良土を作製するためのセメント組成物を製造する、セメント組成物の製造方法であって、
前記対象土が、火山灰質粘性土であり、
前記対象土の含水比を測定する第一工程と、前記対象土中のアロフェンの含有量を測定する第二工程とを行い、改良土の配合を設計する、セメント組成物の製造方法である。
Further, the present invention is a method for producing a cement composition for producing a cement composition for producing an improved soil in which a target soil and a cement composition containing cement are mixed.
The target soil is a volcanic ash clay soil,
It is a manufacturing method of the cement composition which performs the 1st process which measures the moisture content of the said target soil, and the 2nd process which measures the content of allophane in the said target soil, and designs the mixture of improved soil.
さらに、本発明は、対象土と、セメントを含有するセメント組成物とが混合された改良土を作製するための改良土の配合設計を行う、改良土の配合設計方法であって、
前記対象土が、火山灰質粘性土であり、
前記対象土の含水比を測定する第一工程と、前記対象土中のアロフェンの含有量を測定する第二工程とを行い、改良土の配合を設計する、改良土の配合設計方法である。
Furthermore, the present invention is an improved soil compounding design method for performing an improved soil compounding design for producing an improved soil in which a target soil and a cement composition containing cement are mixed.
The target soil is a volcanic ash clay soil,
It is a blending design method for improved soil, in which a first step of measuring the water content ratio of the target soil and a second step of measuring the allophane content in the target soil are performed to design the blend of the improved soil.
本発明によれば、簡便に改良土の配合設計を行うことができる改良土の製造方法、セメント組成物の製造方法、及び、改良土の配合設計方法を提供し得る。 ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the improved soil which can perform the mixing design of improved soil simply, the manufacturing method of a cement composition, and the mixing design method of improved soil can be provided.
以下、本発明の一実施形態について説明する。 Hereinafter, an embodiment of the present invention will be described.
まず、本実施形態の改良土の製造方法について説明する。 First, the manufacturing method of the improved soil of this embodiment is demonstrated.
本実施形態の改良土の製造方法では、対象土と、セメントを含有するセメント組成物とが混合された改良土を作製する。前記対象土は、火山灰質粘性土である。
また、本実施形態の改良土の製造方法は、前記対象土の含水比を測定する第一工程と、前記対象土中のアロフェンの含有量を測定する第二工程とを備えており、これらの測定値に基づいて改良土の配合を設計する。また、本実施形態の改良土の製造方法は、前記第一工程及び前記第二工程後に改良土の作製を行う方法である。
In the manufacturing method of the improved soil of this embodiment, the improved soil in which the target soil and the cement composition containing cement are mixed is produced. The target soil is a volcanic ash clay.
Further, the improved soil manufacturing method of the present embodiment includes a first step of measuring the water content ratio of the target soil and a second step of measuring the content of allophane in the target soil. Design the improved soil mix based on the measurements. Moreover, the manufacturing method of the improved soil of this embodiment is a method of producing the improved soil after the first step and the second step.
前記第一工程で測定する「対象土の含水比」は、「対象土中の水の質量／対象土中の固形分の質量」を「質量％」で表したものを意味する。
なお、「対象土の含水比」は、地盤工学会のＪＧＳ０１２１−２００９「土の含水比試験方法」により測定することができる。
The “water content ratio of the target soil” measured in the first step means “mass of water in the target soil / mass of solid content in the target soil” expressed by “mass%”.
The “water content ratio of the target soil” can be measured by JGS0121-2009 “Soil water content ratio test method” of the Geotechnical Society of Japan.
前記第二工程で測定する「対象土中のアロフェンの含有量」は、「対象土中のアロフェンの質量／対象土の体積」を「ｋｇ／ｍ３」で表したものを意味する。
なお、「対象土中のアロフェンの含有量」は、「８Ｎ ＨＣｌ−０．５Ｎ ＮａＯＨ交互溶解法」、北川 靖男；土壌中のアロフェンおよび非晶質無機成分の定量に関する研究 農業技術報告 Ｖｏｌ.２９ ｐ１−３７（１９７７）に記載の方法で測定することができる。
The “content of allophane in the target soil” measured in the second step means “kg / m 3 ” of “mass of allophane in the target soil / volume of the target soil”.
In addition, “content of allophane in the target soil” is “8N HCl-0.5N NaOH alternate dissolution method”, Atsuo Kitagawa; Research on determination of allophane and amorphous inorganic components in soil Agricultural Technical Report Vol.29 It can be measured by the method described in p1-37 (1977).
本実施形態の改良土の製造方法では、例えば、前記対象土中のアロフェンの含有量の測定値が４００ｋｇ／ｍ３未満である場合には、前記対象土の固形分の質量に対する前記改良土の水の質量をＷ比とし、前記対象土の体積に対する前記セメント組成物中のＣａＯの質量をＣａＯ量としたときに、Ｗ比を１５０質量％以上、ＣａＯ量を１６５ｋｇ／ｍ３以上、好ましくは１６５〜３５０ｋｇ／ｍ３、Ｗ比をＣａＯ量で割った値を１．０（質量％・ｍ３／ｋｇ）以下にし、更に、前記対象土の体積に対する前記セメント組成物中のＳＯ３の質量を２０ｋｇ／ｍ３以上、好ましく２０〜１００ｋｇ／ｍ３にする。
また、本実施形態の改良土の製造方法では、例えば、前記対象土中のアロフェンの含有量の測定値が４００ｋｇ／ｍ３以上である場合には、前記対象土の固形分の質量に対する前記改良土の水の質量をＷ比とし、前記対象土の体積に対する前記セメント組成物中のＣａＯの質量をＣａＯ量としたときに、Ｗ比を１６０質量％以上、ＣａＯ量を１７０ｋｇ／ｍ３以上、好ましくは１７０〜３５０ｋｇ／ｍ３、さらに好ましくは１７０〜３００ｋｇ／ｍ３、Ｗ比をＣａＯ量で割った値を１．０（質量％・ｍ３／ｋｇ）以下にし、更に、前記対象土の体積に対する前記セメント組成物中のＳＯ３の質量を３０ｋｇ／ｍ３以上、好ましくは３０〜１００ｋｇ／ｍ３にする。
In the method for producing improved soil according to the present embodiment, for example, when the measured value of the allophane content in the target soil is less than 400 kg / m 3 , When the mass of water is the W ratio and the mass of CaO in the cement composition relative to the volume of the target soil is the CaO amount, the W ratio is 150 mass% or more, and the CaO amount is 165 kg / m 3 or more, preferably 165 to 350 kg / m 3 , the value obtained by dividing the W ratio by the CaO amount is 1.0 (mass% · m 3 / kg) or less, and the mass of SO 3 in the cement composition with respect to the volume of the target soil the 20 kg / m 3 or more, to preferably 20 and 100 kg / m 3.
Moreover, in the manufacturing method of the improved soil of this embodiment, for example, when the measured value of the content of allophane in the target soil is 400 kg / m 3 or more, the improvement with respect to the mass of the solid content of the target soil is performed. When the mass of soil water is the W ratio, and the mass of CaO in the cement composition relative to the volume of the target soil is the CaO amount, the W ratio is 160 mass% or more, the CaO amount is 170 kg / m 3 or more, Preferably, 170 to 350 kg / m 3 , more preferably 170 to 300 kg / m 3 , and a value obtained by dividing the W ratio by the CaO amount is 1.0 (mass% · m 3 / kg) or less, and further, the mass of SO 3 of the cement composition to volume 30kg / m 3 or more, preferably between 30~100kg / m 3.
また、本実施形態の改良土の製造方法では、前記第一工程で求めた測定値及び第二工程で求めた測定値の２つの測定値、並びに、前記改良土の圧縮強さの目標値に基づいて、前記対象土と前記セメント組成物との混合比、前記セメント組成物中のＣａＯ含有量、前記セメント組成物中のＳＯ３含有量、及び、前記対象土に加える水の割合を求めてもよい。
本実施形態の改良土の製造方法では、これにより、測定値としては２つの測定値のみで改良土の配合設計を行うことができる。言い換えれば、本実施形態の改良土の製造方法では、対象土中のビチューメン、フミン酸、フルボ酸、および、非晶質相（アロフェンを除く）の含有率の測定値を用いずとも、改良土の配合設計を行うことができる。
なお、前記圧縮強さは、後述するような材齢２８日のものに限らず、例えば、材齢３日や７日等の他の材齢のものであってもよい。
Further, in the improved soil manufacturing method of the present embodiment, the two measured values of the measured value obtained in the first step and the measured value obtained in the second step, and the target value of the compressive strength of the improved soil. Based on the above, the mixing ratio between the target soil and the cement composition, the CaO content in the cement composition, the SO 3 content in the cement composition, and the ratio of water added to the target soil are obtained. Also good.
In the improved soil manufacturing method of the present embodiment, it is possible to design the improved soil with only two measured values. In other words, in the method for producing the improved soil of the present embodiment, the improved soil can be used without using the measured values of the contents of bitumen, humic acid, fulvic acid, and amorphous phase (excluding allophane) in the target soil. Can be formulated.
In addition, the compressive strength is not limited to a material age of 28 days as described later, and may be a material of another material age such as a material age of 3 days or 7 days.
また、本実施形態の改良土の製造方法では、前記改良土の圧縮強さの目標値を用いる場合には、前記第一工程及び第二工程で求めた測定値、前記改良土の材齢２８日の圧縮強さの目標値、並びに、下記式を用いて、前記対象土と前記セメント組成物との混合比、前記セメント組成物中のＣａＯ含有量、前記セメント組成物中のＳＯ３含有量、及び、前記対象土に加える水の割合を求めることが好ましい。
「ｑｕ２８」 ＝ ａ×「水」 ＋ ｂ×「ＣａＯ」 ＋ ｃ×「ＳＯ３」 ＋ ｄ×「アロフェン」 ＋ ｅ
ここで、前記「ｑｕ２８」は、「改良土の材齢２８日の圧縮強さの目標値」（ｋＮ／ｍ２）を表し、前記「水」は、「対象土の固形分の質量に対する前記改良土の水の質量」（質量％）を表し、前記「ＣａＯ」は、「対象土の体積に対する前記セメント組成物中のＣａＯの質量」（ｋｇ／ｍ３）を表し、前記「ＳＯ３」は、「対象土の体積に対する前記セメント組成物中のＳＯ３の質量」（ｋｇ／ｍ３）を表し、前記「アロフェン」は、「対象土中のアロフェンの含有量」（ｋｇ／ｍ３）を表す。
また、前記「ａ」は、−６９〜−９３であり、好ましくは−７３〜−８９、さらに好ましくは−７７〜−８５である。前記「ｂ」は、３０〜４１であり、好ましくは３２〜３９、さらに好ましくは３４〜３８である。前記「ｃ」は、２５〜３４であり、好ましくは２７〜３３、さらに好ましくは、２８〜３１である。前記「ｄ」は、−２．３〜−３．２であり、好ましくは−２．５〜−３．０、さらに好ましくは、−２．６〜−２．９である。前記「ｅ」は、６８８６〜９３１７であり、好ましくは７２９２〜８９１２、さらに好ましくは、７６９７〜８５０７である。
なお、圧縮強さは、ＪＩＳ Ａ１２１６：２００９「土の一軸圧縮試験方法」に従って測定したものを意味する。
Moreover, in the manufacturing method of the improved soil of this embodiment, when using the target value of the compressive strength of the improved soil, the measured value obtained in the first step and the second step, the age of the improved soil 28 Using the target value of the compressive strength of the day and the following formula, the mixing ratio of the target soil and the cement composition, the CaO content in the cement composition, the SO 3 content in the cement composition It is preferable to determine the ratio of water added to the target soil.
“Qu28” = a × “water” + b × “CaO” + c × “SO 3 ” + d × “allophane” + e
Here, “qu28” represents “target value of compressive strength of modified soil at age 28 days” (kN / m 2 ), and “water” represents “the mass relative to the solid content of the target soil”. The mass of water in the improved soil "(% by mass) is represented, and the" CaO "represents" the mass of CaO in the cement composition with respect to the volume of the target soil "(kg / m 3 ), and the" SO 3 " Represents “mass of SO 3 in the cement composition with respect to the volume of the target soil” (kg / m 3 ), and the “allophane” means “content of allophane in the target soil” (kg / m 3 ). Represents.
The “a” is −69 to −93, preferably −73 to −89, and more preferably −77 to −85. Said "b" is 30-41, Preferably it is 32-39, More preferably, it is 34-38. The “c” is 25 to 34, preferably 27 to 33, and more preferably 28 to 31. The “d” is −2.3 to −3.2, preferably −2.5 to −3.0, and more preferably −2.6 to −2.9. Said "e" is 6886-9317, Preferably it is 7292-8912, More preferably, it is 7697-8507.
The compressive strength means a value measured according to JIS A1216: 2009 “Soil uniaxial compression test method”.
前記セメント組成物は、セメントを含有する。前記セメントとしては、例えば、ポルトランドセメント、高炉セメント、シリカセメント、およびエコセメントが挙げられる。前記ポルトランドセメントとしては、普通ポルトランドセメント、早強ポルトランドセメント、超早強ポルトランドセメント、中庸熱ポルトランドセメント、低熱ポルトランドセメント、および耐硫酸塩ポルトランドセメント等が挙げられる。前記セメントは、スラグ、石膏を含んでもよい。前記セメント組成物は、前記セメントを含有することにより、ＣａＯ及びＳＯ３を含有する。
前記セメント組成物は、混和剤や混和材を含有してもよい。
The cement composition contains cement. Examples of the cement include Portland cement, blast furnace cement, silica cement, and ecocement. Examples of the Portland cement include ordinary Portland cement, early-strength Portland cement, ultra-early strong Portland cement, moderately hot Portland cement, low heat Portland cement, and sulfate-resistant Portland cement. The cement may include slag and gypsum. The cement composition contains CaO and SO 3 by containing the cement.
The cement composition may contain an admixture or an admixture.
前記対象土に加える水は、前記セメント組成物とともに前記対象土と混合してもよく、前記セメント組成物とは別に前記対象土に混合してもよい。また、前記対象土が十分に水を含んでいる場合には、前記対象土に水を加えなくてもよい。 The water added to the target soil may be mixed with the target soil together with the cement composition, or may be mixed with the target soil separately from the cement composition. Moreover, when the said target soil contains water sufficiently, it is not necessary to add water to the said target soil.
本実施形態のセメント組成物の製造方法では、対象土と、セメントを含有するセメント組成物とが混合された改良土を作製するためのセメント組成物を製造する。前記対象土は、火山灰質粘性土である。また、本実施形態のセメント組成物の製造方法では、前記対象土の含水比を測定する第一工程と、前記対象土中のアロフェンの含有量を測定する第二工程とを行う。 In the method for producing a cement composition of the present embodiment, a cement composition for producing an improved soil in which a target soil and a cement composition containing cement are mixed is produced. The target soil is a volcanic ash clay. Moreover, in the manufacturing method of the cement composition of this embodiment, the 1st process which measures the water content ratio of the said target soil, and the 2nd process which measures content of allophane in the said target soil are performed.
さらに、本実施形態の改良土の配合設計方法では、対象土と、セメントを含有するセメント組成物とが混合された改良土を作製するための改良土の配合設計を行う。前記対象土は、火山灰質粘性土である。また、本実施形態の改良土の配合設計方法は、前記対象土の含水比を測定する第一工程と、前記対象土中のアロフェンの含有量を測定する第二工程とを行う。 Furthermore, in the improved soil blending design method of the present embodiment, the improved soil blending design for producing the improved soil in which the target soil and the cement composition containing cement are mixed is performed. The target soil is a volcanic ash clay. In addition, the improved soil blending design method of the present embodiment performs the first step of measuring the water content ratio of the target soil and the second step of measuring the allophane content in the target soil.
尚、本発明の改良土の製造方法、セメント組成物の製造方法、及び、改良土の配合設計方法は、上記実施形態の構成に限定されるものではない。また、本発明の改良土の製造方法、セメント組成物の製造方法、及び、改良土の配合設計方法は、上記した作用効果に限定されるものでもない。さらに、本発明の改良土の製造方法、セメント組成物の製造方法、及び、改良土の配合設計方法は、本発明の要旨を逸脱しない範囲で種々の変更が可能である。 In addition, the manufacturing method of the improved soil of the present invention, the manufacturing method of the cement composition, and the blending design method of the improved soil are not limited to the configuration of the above embodiment. Further, the improved soil production method, cement composition production method, and improved soil blending design method of the present invention are not limited to the above-described effects. Furthermore, the modified soil manufacturing method, cement composition manufacturing method, and improved soil blending design method of the present invention can be variously modified without departing from the gist of the present invention.
次に、試験例を挙げて本発明についてさらに具体的に説明する。 Next, the present invention will be described more specifically with reference to test examples.
対象土として火山灰質粘性土である関東ロームを関東の３か所で採取した。
そして、それぞれの対象土について、含水比、及び、アロフェンの含有量を測定した。なお、含水比、及び、アロフェンの含有量は上述した方法で測定した。
次に、それぞれの火山灰質粘性土と、ＣａＯ及びＳＯ３を含有するセメント組成物と、水とをソイルミキサで６分間混合し、下記表１〜６の改良土を作製した。
なお、下記表では、「対象土中のアロフェンの含有量」を「アロフェン」と表し、「対象土の固形分の質量に対する前記改良土の水の質量」を「水」と表し、「対象土の体積に対する前記セメント組成物中のＣａＯの質量」を「ＣａＯ」と表し、「対象土の体積に対する前記セメント組成物中のＳＯ３の質量」を「ＳＯ３」と表す。また、「対象土の固形分の質量に対する前記改良土の水の質量」を「対象土の体積に対する前記セメント組成物中のＣａＯの質量」で割ったものを「水／ＣａＯ」と表す。「対象土の固形分の質量に対する前記改良土の水の質量」は、含水比、及び、対象土に加えた水の量から求めた。
そして、改良土をφ５ｃｍ、高さ１０ｃｍの型枠に投入した後、２０℃で封緘養生し、ＪＧＳ０８２１−２００８「安定処理土の締固めをしない供試体作製方法」に準拠して供試体を作製した。
次に、材齢２８日の前記供試体の一軸圧縮強さ（以下、［ｑｕ２８」ともいう。）を測定した。結果を下記表１〜６に示す。
Kanto loam, a volcanic ash clay, was collected at three locations in the Kanto region.
And about each target soil, the water content ratio and the content of allophane were measured. The water content ratio and the allophane content were measured by the methods described above.
Then, the respective ash quality Clay, cement compositions containing CaO and SO 3, and water were mixed for 6 minutes at Soirumikisa to prepare a modified soil in the following Table 1-6.
In the following table, “content of allophane in the target soil” is expressed as “allophane”, “mass water of the improved soil relative to the mass of the solid content of the target soil” is expressed as “water”, and “target soil” The “mass of CaO in the cement composition relative to the volume of” is expressed as “CaO”, and the “mass of SO 3 in the cement composition relative to the volume of the target soil” is expressed as “SO 3 ”. Further, “water / CaO” is obtained by dividing “the mass of the water of the improved soil with respect to the mass of the solid content of the target soil” divided by “the mass of CaO in the cement composition with respect to the volume of the target soil”. “The mass of the water of the improved soil relative to the mass of the solid content of the target soil” was determined from the water content ratio and the amount of water added to the target soil.
Then, after the improved soil is put into a mold having a diameter of 5 cm and a height of 10 cm, it is sealed and cured at 20 ° C., and a specimen is prepared according to JGS0821-2008 “Method for preparing specimen without compaction of stabilized soil”. did.
Next, the uniaxial compressive strength (hereinafter, also referred to as “qu28”) of the specimen on the age of 28 days was measured. The results are shown in Tables 1 to 6 below.
アロフェンの含有量の測定値が２１９ｋｇ／ｍ３、３１６ｋｇ／ｍ３である対象土においては、前記対象土の固形分の質量に対する前記改良土の水の質量をＷ比とし、前記対象土の体積に対する前記セメント組成物中のＣａＯの質量をＣａＯ量としたときに、Ｗ比が１５０質量％以上、ＣａＯ量が１６５ｋｇ／ｍ３以上、Ｗ比をＣａＯ量で割った値が１．０（質量％・ｍ３／ｋｇ）以下であり、更に、前記対象土の体積に対する前記セメント組成物中のＳＯ３の質量が２０ｋｇ／ｍ３以上である供試体は、材齢２８日での一軸圧縮強さが１０００ｋＮ／ｍ２を超えていた。
また、アロフェンの含有量の測定値が４１９ｋｇ／ｍ３である対象土においては、前記対象土の固形分の質量に対する前記改良土の水の質量をＷ比とし、前記対象土の体積に対する前記セメント組成物中のＣａＯの質量をＣａＯ量としたときに、Ｗ比が１６０質量％以上、ＣａＯ量が１７０ｋｇ／ｍ３以上、Ｗ比をＣａＯ量で割った値が１．０（質量％・ｍ３／ｋｇ）以下であり、更に、前記対象土の体積に対する前記セメント組成物中のＳＯ３の質量が３０ｋｇ／ｍ３以上である供試体は、材齢２８日での一軸圧縮強さが１０００ｋＮ／ｍ２を超えていた。
Measurements 219 kg / m 3 of the content of allophane, in subjects soil is 316 kg / m 3, the mass of water of the modified soil to the solid content of the mass of the target soil is W ratio, the volume of the target soil When the mass of CaO in the cement composition is the CaO amount, the W ratio is 150 mass% or more, the CaO amount is 165 kg / m 3 or more, and the value obtained by dividing the W ratio by the CaO amount is 1.0 (mass % · M 3 / kg) or less, and the specimen having a mass of SO 3 in the cement composition with respect to the volume of the target soil is 20 kg / m 3 or more is uniaxial compressive strength at a material age of 28 days. Was over 1000 kN / m 2 .
Further, in the target soil having a measured value of allophane content of 419 kg / m 3 , the mass of water in the improved soil with respect to the solid content of the target soil is defined as W ratio, and the cement with respect to the volume of the target soil. When the CaO mass in the composition is the CaO amount, the W ratio is 160 mass% or more, the CaO amount is 170 kg / m 3 or more, and the value obtained by dividing the W ratio by the CaO amount is 1.0 (mass% · m 3 / kg), and further, the specimen having a mass of SO 3 in the cement composition with respect to the volume of the target soil is 30 kg / m 3 or more has a uniaxial compressive strength at a material age of 28 days of 1000 kN. / M 2 .
上記データを用いて、「材齢２８日での一軸圧縮強さ」（「ｑｕ２８」）を従属変数（目的変数）とし、「対象土中のアロフェンの含有量」（「アロフェン」）、「対象土の固形分の質量に対する前記改良土の水の質量」（「水」）、「対象土の体積に対する前記セメント組成物中のＣａＯの質量」（「ＣａＯ」）、及び、「対象土の体積に対する前記セメント組成物中のＳＯ３の質量」（「ＳＯ３」）を独立変数（説明変数）として、重回帰分析を行い、最小二乗法により下記回帰式の係数ａ〜ｅを求めた。
「ｑｕ２８」 ＝ ａ×「水」 ＋ ｂ×「ＣａＯ」 ＋ ｃ×「ＳＯ３」 ＋ ｄ×「アロフェン」 ＋ ｅ
Using the above data, “uniaxial compressive strength at 28 days of age” (“qu28”) as a dependent variable (target variable), “content of allophane in the target soil” (“allophane”), “target The mass of the improved soil water relative to the mass of the soil solid ("water"), "the mass of CaO in the cement composition relative to the volume of the target soil"("CaO"), and the volume of the target soil The multiple regression analysis was performed by using “the mass of SO 3 in the cement composition” (“SO 3 ”) as an independent variable (explanatory variable), and coefficients a to e of the following regression equations were obtained by the least square method.
“Qu28” = a × “water” + b × “CaO” + c × “SO 3 ” + d × “allophane” + e
そして、上記回帰式に、「対象土中のアロフェンの含有量」、「対象土の固形分の質量に対する前記改良土の水の質量」、「対象土の体積に対する前記セメント組成物中のＣａＯの質量」、及び、「対象土の体積に対する前記セメント組成物中のＳＯ３の質量」の値を代入して「材齢２８日での一軸圧縮強さ」の「予測値」を求めた。
図１に、材齢２８日での一軸圧縮強さの実測値と予測値との関係を示す。
図１に示すように、材齢２８日での一軸圧縮強さの実測値と予測値とが同程度の値を示した。
And, in the above regression equation, “content of allophane in the target soil”, “mass of the water of the improved soil relative to the mass of the solid content of the target soil”, “CaO in the cement composition relative to the volume of the target soil” The “predicted value” of “uniaxial compressive strength at 28 days of age” was determined by substituting the values of “mass” and “mass of SO 3 in the cement composition with respect to the volume of the target soil”.
FIG. 1 shows the relationship between the measured value and the predicted value of the uniaxial compressive strength at the age of 28 days.
As shown in FIG. 1, the measured value and the predicted value of the uniaxial compressive strength at a material age of 28 days showed similar values.
また、上記重回帰分析で求めた各係数ａ〜ｅの値から、１５％分引いた値（−１５％）、１０％分引いた値（−１０％）、５％分引いた値（−５％）を求め、また、上記重回帰分析で求めた各係数ａ〜ｅの値に、５％分足した値（５％）、１０％分足した値（１０％）、１５％分足した値（１５％）を求めた。言い換えると、上記重回帰分析で求めた各係数ａ〜ｅに、０．８５、０．９０、０．９５、１．０５、１．１０、１．１５を掛けた値を求めた。これらの値を表７に示す。 Further, from the values of the coefficients a to e obtained by the multiple regression analysis, a value subtracted by 15% (−15%), a value subtracted by 10% (−10%), and a value subtracted by 5% (− 5%), and the values of the coefficients a to e obtained by the above multiple regression analysis are added by 5% (5%), added by 10% (10%), and added by 15%. Value (15%) was determined. In other words, values obtained by multiplying the coefficients a to e obtained by the multiple regression analysis by 0.85, 0.90, 0.95, 1.05, 1.10, and 1.15 were obtained. These values are shown in Table 7.
Claims (6)
前記対象土が、火山灰質粘性土であり、
前記対象土の含水比を測定する第一工程と、前記対象土中のアロフェンの含有量を測定する第二工程とを改良土の作製前に行い、改良土の配合を設計する、改良土の製造方法。 A method for producing an improved soil, wherein an improved soil in which a target soil and a cement composition containing cement are mixed is prepared,
The target soil is a volcanic ash clay soil,
The first step of measuring the moisture content of the target soil and the second step of measuring the allophane content in the target soil are performed before the preparation of the improved soil, and the composition of the improved soil is designed. Production method.
前記対象土が、火山灰質粘性土であり、
前記対象土の含水比を測定する第一工程と、前記対象土中のアロフェンの含有量を測定する第二工程とを行う、セメント組成物の製造方法。 A method for producing a cement composition for producing a cement composition for producing an improved soil in which a target soil and a cement composition containing cement are mixed,
The target soil is a volcanic ash clay soil,
The manufacturing method of the cement composition which performs the 1st process of measuring the water content ratio of the said target soil, and the 2nd process of measuring content of the allophane in the said target soil.
前記対象土が、火山灰質粘性土であり、
前記対象土の含水比を測定する第一工程と、前記対象土中のアロフェンの含有量を測定する第二工程とを行う、改良土の配合設計方法。 An improved soil compounding design method for performing an improved soil compounding design for producing an improved soil in which a target soil and a cement composition containing cement are mixed,
The target soil is a volcanic ash clay soil,
A method for blending and designing improved soil, comprising performing a first step of measuring a water content ratio of the target soil and a second step of measuring a content of allophane in the target soil.
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