【摘要】：近年來,國(guó)內(nèi)外地震頻繁發(fā)生,已有多地邊坡遭受地震災(zāi)害,造成了重大經(jīng)濟(jì)損失。而由于地震影響下破壞的邊坡與自然破壞邊坡的不同,這使治理震后邊坡病害顯得尤為重要；而對(duì)邊坡土體的動(dòng)力特性研究是治理震后邊坡的基礎(chǔ)。為得到青海玉樹地區(qū)邊坡土體的動(dòng)力特性,本文主要進(jìn)行了如下研究：首先,對(duì)既有的土體動(dòng)力特性的研究方法和成果進(jìn)行簡(jiǎn)要概括,分析結(jié)果表明既有研究成果不能正確預(yù)測(cè)青海玉樹地區(qū)邊坡土體動(dòng)力特性,根據(jù)試驗(yàn)研究目的提出了青海玉樹震后邊坡土體的試驗(yàn)研究方案。其次,通過室內(nèi)常規(guī)試驗(yàn)測(cè)得震后玉樹邊坡土體的密度、含水率、顆粒成分、孔隙比等相關(guān)物理參數(shù)；以室內(nèi)三軸試驗(yàn)為研究手段,討論并分析了本區(qū)土體的動(dòng)力特性與含水率及圍壓之間的關(guān)系；又通過GDS試驗(yàn),研究了在含有大顆粒土體的情況下,孔隙比、含水率、圍壓等對(duì)土體動(dòng)強(qiáng)度的影響。根據(jù)實(shí)測(cè)結(jié)果,分析了有關(guān)動(dòng)強(qiáng)度與圍壓、含水率、孔隙比等關(guān)系趨勢(shì),得出了土體的動(dòng)摩擦角、動(dòng)粘聚力等動(dòng)參數(shù)以及動(dòng)強(qiáng)度與動(dòng)應(yīng)變的關(guān)系曲線。試驗(yàn)研究結(jié)果表明：在含水率一定時(shí),增大圍壓可以提高土體動(dòng)強(qiáng)度；孔隙比越小(土體越密實(shí)),土體抵抗動(dòng)荷載破壞的能力越強(qiáng)。最后,根據(jù)試驗(yàn)研究成果和國(guó)內(nèi)外有關(guān)動(dòng)本構(gòu)模型理論研究,建立了適合玉樹地區(qū)土體的動(dòng)本構(gòu)模型,以期為青海玉樹地區(qū)實(shí)際工程邊坡的防護(hù)和治理提供必要的理論依據(jù)。
[Abstract]:In recent years, earthquakes occur frequently at home and abroad, and many slopes have suffered from earthquake disasters, resulting in great economic losses. Because of the difference between the damaged slope and the natural damaged slope under the influence of earthquake, it is particularly important to control the slope disease after the earthquake, and the study of the dynamic characteristics of the slope soil is the basis for the treatment of the post-earthquake slope. In order to obtain the dynamic characteristics of slope soil in Yushu area of Qinghai Province, the main contents of this paper are as follows: firstly, the existing research methods and achievements of dynamic characteristics of soil are briefly summarized. The analysis results show that the existing research results can not correctly predict the dynamic characteristics of slope soil in Yushu area, Qinghai Province. according to the purpose of the experimental study, the experimental research scheme of slope soil after Yushu earthquake in Qinghai Province is put forward. Secondly, the density, moisture content, particle composition, pore ratio and other related physical parameters of Yushu slope after earthquake were measured by conventional laboratory test. The relationship between dynamic characteristics, moisture content and confining pressure of soil in this area is discussed and analyzed by means of triaxial test in laboratory. The effects of pore ratio, moisture content and confining pressure on the dynamic strength of soil with large particles were studied by GDS test. According to the measured results, the relationship between dynamic strength and confining pressure, water content and pore ratio is analyzed, and the dynamic parameters such as dynamic friction angle, dynamic cohesion force and the relationship curve between dynamic strength and dynamic strain are obtained. The experimental results show that the dynamic strength of soil can be improved by increasing the confining pressure when the moisture content is constant, and the smaller the pore ratio is (the denser the soil is), the stronger the ability of soil to resist dynamic load damage is. Finally, according to the experimental results and the theoretical research of dynamic Constitutive Model at home and abroad, a dynamic Constitutive Model suitable for soil in Yushu area is established in order to provide the necessary theoretical basis for the protection and treatment of practical engineering slope in Yushu area of Qinghai Province.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU435

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