砾性土剪切波速影响因素研究

发布时间：2018-10-04 18:55

【摘要】：砾性土指的是含有多粒组成分的宽级配土,包含碎石、砾、砂、粉粒、粘粒等,以往的砾石土、砂砾土、砾砂等也包含其中,是一种典型的天然土壤,并且大量存在于交通和水利等工程中。世界范围内,地震引发的液化现象造成了很严重的后果,我国也不例外。以往的液化研究中,学者和研究者主要把注意力集中在饱和砂土、饱和粉土的问题上。但是地震考察的资料显示,砾性土在一定条件下也会发生液化,后果同样严重,关于砾性土液化的研究亟待开展。对于砾性土液化,其机理有待解释,并且研究表明目前国内外典型的砂土液化判别方法均不适用。所以对砾性土液化问题,需要重新建立一套针对砾性土液化的判别方法,同时对砾性土液化的可能性给出合理解释。土体的剪切波速是土体一种重要的综合性参数,和其液化性能密切相关。目前关于砾性土剪切波速的研究成果很少,尤其在砾性土剪切波速的影响因素方面,因为种种原因,以往没有研究成果发表,尚属空白领域。鉴于砾性土剪切波速的研究对砂砾土液化研究的重要意义,本文通过室内实验方法,对砾性土剪切波速的影响因素进行了研究。论文的主要工作包括:1.选择合适的实验仪器和实验方法,选择实验材料,选择要研究的实验参数,制定实验计划。2.通过室内实验,分析含砾量对砾性土剪切波速的影响。3.通过室内实验,分析相对密度对砾性土剪切波速的影响。4.通过室内实验,分析固结应力对砾性土剪切波速的影响。5.通过室内实验,分析固结应力比对砾性土剪切波速的影响。
[Abstract]:Gravelly soil refers to a wide gradation of soils containing multi-grain components, including gravel, sand, silt, clay, etc., and the gravel soil, gravel sand, etc., which is a typical natural soil. And a large number of traffic and water conservancy and other projects. Worldwide, the earthquake-induced liquefaction has caused serious consequences, China is no exception. In previous liquefaction studies, scholars and researchers have focused on saturated sand and saturated silt. However, the data of seismic investigation show that the liquefaction of gravel soil will also occur under certain conditions, the consequences are also serious, and the research on liquefaction of gravel soil needs to be carried out urgently. The mechanism of gravel soil liquefaction needs to be explained, and the research shows that the typical methods of sand liquefaction at home and abroad are not applicable. Therefore, to the liquefaction of gravel soil, it is necessary to re-establish a set of discriminant methods for liquefaction of gravel soil and give a reasonable explanation of the possibility of liquefaction of gravel soil at the same time. The shear wave velocity of soil is an important comprehensive parameter and is closely related to its liquefaction performance. At present, there are few researches on shear wave velocity of gravel soil, especially on the influencing factors of shearing wave velocity in gravel soil. For various reasons, no research results have been published in the past, so it is still a blank field. In view of the importance of the study on shear wave velocity of gravel soil to the liquefaction of sandy gravel soil, the factors influencing the shear wave velocity of gravel soil are studied through laboratory experiments. The main work of the thesis includes 1: 1. Choose the appropriate experimental instruments and methods, select the experimental materials, select the experimental parameters to be studied, and formulate the experimental plan. 2. Through laboratory experiments, the influence of gravel content on shear wave velocity of gravel soil is analyzed. The influence of relative density on shear wave velocity of gravel soil was analyzed by laboratory experiments. The influence of consolidation stress on shear wave velocity of gravel soil is analyzed by laboratory experiments. The influence of consolidation stress ratio on shear wave velocity of gravel soil was analyzed through laboratory experiments.
【学位授予单位】：中国地震局工程力学研究所
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU435;P315.9

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