基于渗流—应力耦合作用的边坡稳定性分析

发布时间：2018-02-20 03:42

本文关键词： 边坡数值模拟 π定理渗流耦合分析　出处：《武汉科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着国家对基础建设投资的加大，大量岩土工程问题随之涌现。其中，边坡与基坑的稳定性问题更加突出。特别是沿海地区，工程岩土体受地下水渗流的影响，大量边坡失稳事故的产生都是由于地下水的作用。研究地下水渗流对边坡稳定性的影响有较大的实际意义。选取边坡的典型剖面，运用FLAC3D软件进行建模与计算，通过应力和位移云图分析边坡稳定性情况。通过改变地下水位，计算分析边坡稳定性变化情况，探讨地下水对边坡的影响机理和作用效果。基于π定理和强度折减法理论，分别计算边坡在不同参数组合下的安全系数，分析岩土体强度参数的变化对边坡稳定性的影响，，并建立安全系数与各影响因素之间的π参数形式函数关系；结果表明，岩土体强度参数中，粘聚力和内摩擦角对边坡的安全系数影响比抗拉强度明显。以广州某基坑边坡工程实例为研究对象，建立三维模型，计算分析边坡在无水干燥、渗流应力不耦合与渗流应力耦合三种工况下的稳定性情况；得出三种工况下的基坑边坡安全系数分别为1.7，1.4和1.1，说明地下水和边坡应力场耦合作用对边坡的稳定性影响明显，在分析讨论含水边坡的稳定性问题时，考虑地下水与边坡的耦合作用十分必要；为类似工程边坡稳定性分析提供借鉴。
[Abstract]:With the increase of national investment in infrastructure construction, a large number of geotechnical engineering problems have emerged. Among them, the stability of slope and foundation pit is more prominent. Especially in coastal areas, engineering rock and soil are affected by groundwater seepage. A large number of slope instability accidents are due to the role of groundwater. It is of great practical significance to study the influence of groundwater seepage on slope stability. The typical profile of the slope is selected, the stability of the slope is analyzed by using the FLAC3D software, the stability of the slope is analyzed by the cloud diagram of stress and displacement, and the variation of the slope stability is calculated and analyzed by changing the groundwater level. The influence mechanism and effect of groundwater on slope are discussed. Based on 蟺 theorem and strength reduction theory, the safety factors of slope under different parameter combinations are calculated, and the influence of rock and soil strength parameters on slope stability is analyzed. The 蟺 -parameter function between the safety factor and the influencing factors is established, and the results show that the cohesive force and the angle of internal friction have more influence on the safety factor of the slope than the tensile strength among the strength parameters of rock and soil. Taking a slope engineering example of foundation pit in Guangzhou as the research object, a three-dimensional model is established to calculate and analyze the stability of the slope under the conditions of anhydrous drying, seepage stress uncoupling and seepage stress coupling. The results show that the slope safety factors of foundation pit under three conditions are 1.71.4 and 1.1 respectively, which indicates that the coupling effect of groundwater and slope stress field has obvious influence on the stability of slope. When analyzing and discussing the stability of water-bearing slope, It is necessary to consider the coupling effect of groundwater and slope and provide reference for slope stability analysis of similar engineering.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU43

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