地震荷载作用下江北区头塘小学泥岩边坡的安全性分析

发布时间：2018-02-26 17:23

本文关键词： 地震动泥岩边坡有限元分析摩擦角坡角　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：地震是自然界里毁坏性极其惨重的自然灾害之一,一旦发生将会给我国造成大量财产损失和人员伤亡。最近几年,我国西部地区的地震频发、震级大、伤亡多、损失重、波及范围广。尤其是零八年发生的汶川大地震,造成了十万多人的失踪和死亡以及八千多亿直接的财产损失。另外,我国西部地区的山区较多,地形地貌较复杂,大量基础设施的建设过程中会遇到种类繁多的边坡。所以,对防震和抗震的研究在岩土工程中具有重要的理论意义和应用价值。本文主要以重庆江北区头塘小学旁的泥岩边坡作为研究背景。根据泥岩边坡的实际情况。利用Midas/GTS有限元软件对泥岩边坡的地震反应特性和抗震性能进行分析,主要研究的内容如下:①探讨地震荷载的破坏机理和地震动特性,分析影响边坡动力响应的因素,为后续建立泥岩边坡数学模型提供一定的理论依据。②结合江北区头塘小学旁的泥岩边坡具体实例,运用有限元方法分析在不同强度地震作用下泥岩边坡的动力响应,得出泥岩边坡的位移、最大剪切应变随着时间的变化云图,分析各监测点最值位移变化趋势,结果在一定程度上可以作为泥岩边坡抗震设计的参考依据。③在同一地震荷载的作用下,对不同坡角、不同摩擦角的泥岩边坡抗震性能进行模拟,分析不同工况下其最大剪切应变及最值位移的变化情况,为边坡的安全性设计提供参考依据。④分别从水平方向不同角度输入地震荷载时,对泥岩边坡进行数值模拟,分析边坡的动力反应,并将边坡上不同监测点的最值位移进行了对比分析。研究表明,从水平方向不同角度输入地震波对边坡动力失稳有显著性差异,在多数情况下,沿水平垂直于斜坡方向输入地震荷载对边坡的动力失稳影响最大。⑤在分析大量的计算数据基础上,提出一些提高泥岩边坡抗震性能的建设性意见,为类似高边坡设计和施工提供建设性参考。
[Abstract]:Earthquakes are one of the most devastating natural disasters in nature. Once they occur, they will cause a large number of property losses and casualties in our country. In recent years, earthquakes in the western region of China have occurred frequently, with a large magnitude, many casualties and heavy losses. The Wenchuan earthquake on 08, in particular, caused the disappearance and death of more than 100,000 people and the direct loss of more than 800 billion property. In addition, there are more mountainous areas in the western part of China, and the topography and landforms are more complicated. Many kinds of slopes will be encountered during the construction of a large amount of infrastructure. The research on earthquake prevention and seismic resistance has important theoretical significance and application value in geotechnical engineering. This paper mainly takes the mudstone slope beside Toutang Primary School in Jiangbei District of Chongqing as the research background, according to the actual situation of mudstone slope. The seismic response and seismic behavior of mudstone slope are analyzed by Midas/GTS finite element software. The main contents of this study are as follows: 1. The failure mechanism of earthquake load and the characteristics of ground motion are discussed, and the factors that affect the dynamic response of slope are analyzed. This paper provides a certain theoretical basis for the subsequent establishment of mathematical model of mudstone slope. 2 combined with the concrete example of mudstone slope next to Toutang Primary School in Jiangbei District, the dynamic response of mudstone slope under different earthquake intensity is analyzed by using finite element method. The deformation of mudstone slope and the maximum shear strain with time are obtained, and the variation trend of the maximum displacement at each monitoring point is analyzed. Results to some extent, it can be used as the reference for seismic design of mudstone slope. 3. Under the same earthquake load, the seismic behavior of mudstone slope with different slope angles and different friction angles can be simulated. The variation of maximum shear strain and maximum displacement under different working conditions is analyzed, which provides a reference for the safety design of slope. 4. When the seismic load is input from different angles in horizontal direction, the numerical simulation of mudstone slope is carried out. The dynamic response of the slope is analyzed, and the maximum displacement of different monitoring points on the slope is compared and analyzed. The results show that the seismic wave input from the horizontal direction has significant difference on the dynamic instability of the slope, and in most cases, On the basis of analyzing a large amount of calculation data, the author puts forward some constructive suggestions to improve the seismic behavior of mudstone slope. It provides a constructive reference for the design and construction of similar high slope.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU45

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