本文選題：砂卵石土　切入點(diǎn)：流變　出處：《中南大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：摘要：砂卵石土憑借優(yōu)良的工程特性,在巖土工程建設(shè)中得到大量應(yīng)用。但是目前針對砂卵石土工程力學(xué)特性的研究還不多,特別是流變力學(xué)特性研究方面,導(dǎo)致在應(yīng)對巖土工程事故時沒有找到很好的方法。因此,有必要開展砂卵石土的流變力學(xué)特性研究以適應(yīng)當(dāng)前工程實(shí)際的需求。本文采用試驗(yàn)研究、理論分析和數(shù)值模擬相結(jié)合的研究方法,基于砂卵石土剪切流變試驗(yàn),運(yùn)用流變唯象學(xué)理論探討砂卵石土流變力學(xué)特性,建立砂卵石土非線性流變本構(gòu)模型,并將成果應(yīng)用到巖土工程邊坡的穩(wěn)定性分析中。 本文的主要工作及研究成果如下： (1)以砂卵石土邊坡為研究對象,進(jìn)行了級配和含水量等物理特性測試,并按此進(jìn)行配比研究,獲得符合現(xiàn)場條件的砂卵石土人工配比材料,為后續(xù)的相關(guān)室內(nèi)試驗(yàn)創(chuàng)造了條件。 (2)在研究含水率、卵石重量、粘土重量對砂卵石土瞬時直剪強(qiáng)度的影響時,提出了“S”(S=卵石重量/粘土重量)值的概念,對不同級配下試樣的瞬時直剪強(qiáng)度進(jìn)行了分析,得出不同“S”值下,砂卵石土瞬時直剪強(qiáng)度的變化規(guī)律。 (3)在RYL-600巖石剪切流變儀上進(jìn)行了砂卵石土直剪流變試驗(yàn),結(jié)果表明,砂卵石土具有很強(qiáng)的非線性流變變形特性,由此提出了改進(jìn)的七元件粘彈塑性模型用于描述了砂卵石土的粘彈塑性特征。同時將該模型導(dǎo)入到有限元商用數(shù)值計(jì)算軟件中,實(shí)現(xiàn)了邊坡流變變形的仿真模擬。 (4)以砂卵石土注漿固結(jié)體為研究對象,對其進(jìn)行了單軸壓縮流變試驗(yàn),結(jié)果表明,注漿固結(jié)體的流變只存在衰減流變和穩(wěn)態(tài)流變兩個階段,廣義的粘彈性模型可用來對砂卵石土注漿固結(jié)體的流變變形進(jìn)行模擬,由此建立了相應(yīng)線性粘彈性流變本構(gòu)模型。 (5)通過有限元數(shù)值仿真模擬計(jì)算,對比分析了砂卵石土在注漿前后其邊坡的流變變形特性,表明固結(jié)注漿方法可有效提高邊坡的穩(wěn)定性系數(shù)。
[Abstract]:Abstract: sand pebble soil has been widely used in geotechnical engineering by virtue of its excellent engineering characteristics. However, there are few researches on engineering mechanical properties of sandy pebble soil, especially on rheological properties. Therefore, it is necessary to study the rheological properties of sandy pebble soil in order to meet the needs of current engineering. Based on the shear rheological test of sandy pebble soil and rheological phenomenological theory, a nonlinear rheological constitutive model of sandy pebble soil was established by combining theoretical analysis with numerical simulation. The results are applied to the stability analysis of geotechnical engineering slope. The main work and research results of this paper are as follows:. In this paper, the gradation and moisture content are tested, and according to this, the artificial matching materials of sand and pebble soil are obtained, which will create the conditions for subsequent laboratory tests. 2) in studying the influence of moisture content, pebble weight and clay weight on the instantaneous direct shear strength of sandy pebble soil, the concept of "S" S = pebble weight / clay weight is put forward, and the instantaneous direct shear strength of samples with different gradation is analyzed. The change law of instantaneous direct shear strength of sandy pebble soil with different S value is obtained. The direct shear rheological test of sandy pebble soil was carried out on RYL-600 rock shear rheometer. The results show that sand pebble soil has strong nonlinear rheological deformation characteristics. An improved seven-element viscoelastic-plastic model is proposed to describe the viscoelastic-plastic characteristics of sandy pebble soil. The model is introduced into the finite element commercial numerical calculation software and the simulation of slope rheological deformation is realized. (4) the uniaxial compression rheological tests were carried out on sand pebble soil grouting consolidation body. The results show that there are only two stages of rheological attenuation and steady state rheology of grouting consolidation body. The generalized viscoelastic model can be used to simulate the rheological deformation of sand and gravel soil grouting consolidation body, and the corresponding linear viscoelastic rheological constitutive model is established. Through finite element simulation, the rheological deformation characteristics of sandy pebble soil slope before and after grouting are compared and analyzed. The results show that consolidation grouting method can effectively improve the slope stability coefficient.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU43

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本文編號：1629501