青海玉树机场路震后边坡土体动力特性研究

发布时间：2019-05-29 13:35

【摘要】：近年来,国内外地震频繁发生,已有多地边坡遭受地震灾害,造成了重大经济损失。而由于地震影响下破坏的边坡与自然破坏边坡的不同,这使治理震后边坡病害显得尤为重要；而对边坡土体的动力特性研究是治理震后边坡的基础。为得到青海玉树地区边坡土体的动力特性,本文主要进行了如下研究：首先,对既有的土体动力特性的研究方法和成果进行简要概括,分析结果表明既有研究成果不能正确预测青海玉树地区边坡土体动力特性,根据试验研究目的提出了青海玉树震后边坡土体的试验研究方案。其次,通过室内常规试验测得震后玉树边坡土体的密度、含水率、颗粒成分、孔隙比等相关物理参数；以室内三轴试验为研究手段,讨论并分析了本区土体的动力特性与含水率及围压之间的关系；又通过GDS试验,研究了在含有大颗粒土体的情况下,孔隙比、含水率、围压等对土体动强度的影响。根据实测结果,分析了有关动强度与围压、含水率、孔隙比等关系趋势,得出了土体的动摩擦角、动粘聚力等动参数以及动强度与动应变的关系曲线。试验研究结果表明：在含水率一定时,增大围压可以提高土体动强度；孔隙比越小(土体越密实),土体抵抗动荷载破坏的能力越强。最后,根据试验研究成果和国内外有关动本构模型理论研究,建立了适合玉树地区土体的动本构模型,以期为青海玉树地区实际工程边坡的防护和治理提供必要的理论依据。
[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.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU435

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