挡墙加固边坡的稳定分析方法研究

发布时间：2018-10-30 18:38

【摘要】：滑坡是一种常见的地质灾害,挡墙是最常用的加固措施之一。我国现行的《建筑边坡工程技术规范》给出的分析方法没有考虑挡墙的作用。已有的针对挡墙加固边坡的稳定分析方法的研究尚不多见。本文试图基于极限平衡理论推导一种针对挡墙加固边坡的稳定分析方法,并通过有限元验证该方法的合理性。主要的研究内容和成果如下:1)墙背土压力对边坡的稳定计算非常重要,在检索了国内外文献的基础之上,研究了土压力的计算理论。目前常用的土压力计算方法:朗肯土压力、库伦土压力以及基于能量理论的上限解。研究表明,当墙背土体未处于极限状态时,上述经典方法均不一定适用。2)研究了有限元法的基本原理,分析步骤,以及基于有限元的强度折减法的分析过程。基于通用有限元软件程序ABAQUS的强度折减模块,进行了挡墙加固边坡的稳定分析,结果表明有限元方法虽然可以进行复杂条件下的边坡稳定分析,但是分析过程复杂,且不易为一般工程技术人员所掌握。3)研究了基于极限平衡理论的挡墙加固边坡的稳定分析。首先总结了基于极限平衡理论的分析方法的异同点。进而根据规范推荐的Bishop方法的基本假定,根据多种思路考虑了挡墙对边坡的影响。根据文中提出的方法研究了不同坡高和墙角埋深时,挡墙加固边坡的安全系数的变化规律,并与ABAQUS有限元软件的分析结果进行了对比,验证了本文中所述方法的合理性。4)分别采用基于有限元法的强度折减法和本文提出的方法,对衢州市柯城区七里乡边坡工程进行了稳定分析。结果进一步验证了本文提出方法的合理性,表明了文中所述的方法可为同类工程设计、施工提供参考。
[Abstract]:Landslide is a common geological hazard, and retaining wall is one of the most commonly used reinforcement measures. The analysis method given in the current Technical Code for Building Slope Engineering in China does not consider the function of retaining wall. There are few studies on stability analysis of retaining wall reinforced slope. Based on the limit equilibrium theory, this paper attempts to deduce a stability analysis method for retaining wall reinforced slope, and verifies the rationality of the method by finite element method. The main research contents and results are as follows: 1) the earth pressure on the back of the wall is very important to the stability calculation of the slope. Based on the literature at home and abroad, the calculation theory of the earth pressure is studied. The commonly used methods for calculating earth pressure are Rankine earth pressure, Coulomb earth pressure and upper limit solution based on energy theory. The results show that the classical methods mentioned above are not necessarily applicable when the soil on the back of the wall is not in the limit state. 2) the basic principle of the finite element method, the analysis steps and the analysis process of the strength reduction method based on the finite element method are studied. Based on the strength reduction module of the general finite element software program ABAQUS, the stability analysis of the slope strengthened by the retaining wall is carried out. The results show that although the finite element method can be used for slope stability analysis under complex conditions, the analysis process is complex. The stability analysis of retaining wall reinforced slope based on limit equilibrium theory is studied. Firstly, the similarities and differences of the analytical methods based on limit equilibrium theory are summarized. The influence of retaining wall on slope is considered according to the basic assumption of Bishop method recommended by code. According to the method proposed in this paper, the variation law of safety factor of retaining wall reinforced slope with different slope height and depth of wall angle is studied, and the results are compared with the results of ABAQUS finite element software. The rationality of the method mentioned in this paper is verified. 4) the strength reduction method based on finite element method and the method proposed in this paper are used to analyze the stability of Qili Township Slope Project in Quzhou City. The result further verifies the rationality of the method proposed in this paper, and shows that the method described in this paper can provide reference for similar engineering design and construction.
【学位授予单位】：浙江海洋大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU476

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