本文選題：固化黃土 + SH固化劑　； 參考：《太原理工大學(xué)》2015年碩士論文

【摘要】：黃土由于環(huán)境、地質(zhì)、以及自身原因，導(dǎo)致黃土區(qū)別于一般的黏性土，具有一般土所不具備的低強(qiáng)度、濕陷性和結(jié)構(gòu)性等工程特性。黃土的強(qiáng)度問題一直困擾工程界，亟需一種切實(shí)有效的辦法對(duì)黃土進(jìn)行加固處理。所以研究固化黃土的剪切特性并確定其影響因素具有相當(dāng)?shù)膶W(xué)術(shù)意義。 本文采用新型固化劑SH加固山西太原地區(qū)黃土，通過室內(nèi)土工試驗(yàn)和有限元模擬，分析影響固化黃土抗剪強(qiáng)度的因素和規(guī)律，開展固化黃土強(qiáng)度的多元回歸預(yù)測(cè)，主要研究成果如下： （1）不同固化劑摻量黃土的物理試驗(yàn)：液塑限和擊實(shí)試驗(yàn)，得到各摻量固化黃土的液限、塑限含水率和塑性指數(shù)，以及含水率和干密度曲線。 （2）黃土抗剪強(qiáng)度參數(shù)的影響因素，主要有干密度和含水率。黃土的抗剪強(qiáng)度隨干密度的增大而增大，隨含水率的增大而減小。得到不同含水率下黃土試樣的應(yīng)力應(yīng)變曲線，為分析黃土的本構(gòu)模型提供依據(jù)。 （3）固化黃土抗剪強(qiáng)度參數(shù)的影響因素，主要有干密度、摻量和含水率。固化黃土的抗剪強(qiáng)度同樣隨干密度的增大而增大，隨含水率的增大而減小，并隨著固化劑摻量的增加而增加，得到了SH固化黃土的多因素線性回歸方程。 （4）分析脫水方式對(duì)SH固化黃土抗剪強(qiáng)度的影響，得出齡期對(duì)SH固化黃土的抗剪強(qiáng)度參數(shù)無影響的結(jié)論。 （5）對(duì)比重塑黃土的抗剪強(qiáng)度參數(shù)與SH固化黃土的抗剪強(qiáng)度參數(shù)，得到SH固化劑的加固黃土的效果，并給出建議固化劑摻量。綜合考慮影響SH固化黃土的各種因素，建議山西太原地區(qū)可以試驗(yàn)性采用SH固化劑加固黃土，較適宜的固化劑摻量為10%（質(zhì)量分?jǐn)?shù)）。且在工程中盡量提高壓實(shí)度，并做好排水降水設(shè)施，以期達(dá)到良好的加固效果。 （6）通過ANSYS有限元軟件對(duì)固化黃土和黃土三軸試驗(yàn)的數(shù)值模擬，得到試樣的變形的數(shù)值近似解，并與試驗(yàn)結(jié)果進(jìn)行對(duì)比，，驗(yàn)證了用ANSYS分析固化黃土和黃土常規(guī)三軸試樣的有效性。
[Abstract]:Loess is different from the general clay soil because of its environment, geology and its own reasons. It has the engineering characteristics of low strength, collapsibility and structure, which are not possessed by the common soil. The strength problem of loess has always troubled the engineering circle, and a practical and effective method is urgently needed to reinforce loess. Therefore, it is of great academic significance to study the shear characteristics of solidified loess and determine its influencing factors. In this paper, a new curing agent SH is used to reinforce loess in Taiyuan area of Shanxi Province. Through indoor geotechnical test and finite element simulation, the factors and laws affecting the shear strength of solidified loess are analyzed, and the multivariate regression prediction of the strength of solidified loess is carried out. The main findings are as follows: 1) physical test of loess with different content of curing agent: liquid plastic limit and compaction test, the liquid limit, plastic limit moisture content and plastic index, water content and dry density curve of each content of solidified loess are obtained. 2) the main factors affecting the shear strength parameters of loess are dry density and moisture content. The shear strength of loess increases with the increase of dry density and decreases with the increase of moisture content. The stress-strain curves of loess samples with different moisture content are obtained, which provides the basis for analyzing the constitutive model of loess. The main factors affecting the shear strength parameters of solidified loess are dry density, content and moisture content. The shear strength of solidified loess also increases with the increase of dry density, decreases with the increase of moisture content, and increases with the increase of the content of curing agent. The multifactor linear regression equation of SH solidified loess is obtained. 4) the influence of dehydration mode on the shear strength of SH solidified loess is analyzed, and the conclusion is drawn that the age has no effect on the shear strength parameter of SH solidified loess. 5) comparing the shear strength parameters of remolded loess with that of SH solidified loess, the effect of SH curing agent on reinforcing loess is obtained, and the recommended content of solidifying agent is given. Considering all kinds of factors affecting SH solidified loess, it is suggested that SH curing agent can be used to reinforce loess in Taiyuan, Shanxi Province, and the suitable amount of solidifying agent is 10 (mass fraction). In addition, the compaction degree is raised as far as possible, and the drainage and precipitation facilities are done well in order to achieve good reinforcement effect. (6) through the numerical simulation of the triaxial test of solidified loess and loess by ANSYS finite element software, the numerical approximate solution of the deformation of the specimen is obtained, and compared with the test results, the validity of the conventional triaxial test of solidified loess and loess is verified by using ANSYS.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU444;TU411

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