礫性土層液化影響因素初步研究
[Abstract]:Before the Wenchuan earthquake in 2008, there are few reports on the liquefaction of gravel soil both at home and abroad. The problem of gravel soil liquefaction has not attracted the attention of the academia and the engineering community. It is generally considered that the permeability of gravel soil is good. The excess pore pressure in the earthquake is easily dissipated and the gravel soil is divided into non liquefied soil directly. But in the Wenchuan earthquake in 2008, it was formed. A large scale of gravel soil liquefaction has occurred in the plain area, which has been the largest in the world since recorded, breaking the traditional understanding that the natural gravel soil layer will not be liquefied. At present, the understanding of the conditions and influencing factors of the liquefaction of gravel soil is not uniform in the academic circle. In this paper, the influence of the burial condition of gravel soil layer on the liquefaction of gravel soil layer in the Chengdu plain area is studied based on the data of Wenchuan earthquake field, and the FLAC3D software is used to carry out the model of the liquefaction of gravel soil layer. The main contents are as follows: 1. the buried conditions of the liquefied gravel soil layer in Chengdu plain are analyzed, including the groundwater level, depth, the thickness of the overlying clay layer, the thickness of the drainage layer and so on. The mathematical model of the relation between the shear wave velocity of the gravel soil layer in the Chengdu plain and the number of super heavy-duty dynamic penetration is put forward, and.2. is selected to select the constitutive model in the software. The model and appropriate ground motion input are used to determine the seismic response of four typical Wenchuan earthquake (Mianzhu City, Hanwang Town, Wudu village in Hanwang Town, Mianzhu City, Xiang Liu village, shinetu village in Pixian and Rui Kang Garden in Dujiangyan city), and the seismic response of gravel soil liquefaction and non liquefaction sites in Wenchuan earthquake. By using FLAC3D software, nearly 500 kinds of working conditions were calculated, and the effects of peak acceleration, soil parameters (relative density, permeability coefficient), burial conditions (overlying clay layer thickness, sewerage thickness) on the liquefaction of gravel soil layer were preliminarily analyzed.
【學位授予單位】:中國地震局工程力學研究所
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TU435
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