| 基于有限元强度折减法的单双面边坡稳定性分析 |
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| 引用本文： | 高冯,李小军,迟明杰.基于有限元强度折减法的单双面边坡稳定性分析[J].工程地质学报(英文版),2020,28(3):650-657. |
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| 作者姓名： | 高冯 李小军 迟明杰 |
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| 作者单位： | ①.中国地震局地球物理研究所，北京 100081，中国 |
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| 基金项目： | 国家自然科学基金项目U1839202国家自然科学基金项目51639006北京市重大科技专项Z181100003918005央级公益性科研院所基本科研业务费专项DQJB17T01 |
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| 摘 要： | 利用强度折减法和有限元分析软件ABAQUS,研究了单面和双面土体边坡的稳定性。首先,利用典型算例验证了所采用方法的可行性,然后通过模型数值模拟,分析了不同的坡体参数,如坡角、坡高、黏聚力和内摩擦角等情况下单面和双面边坡的稳定性。探讨了各参数对单面和双面边坡稳定安全系数的影响特征和规律,同时也展现了土体塑性应变区发生和扩展过程。结果表明:(1)坡角、坡高、黏聚力和内摩擦角等参数的单独变化对边坡安全性系数的影响规律基本一致、近似线性变化,对单面和双面边坡稳定性的影响规律相同;(2)双面边坡稳定性比单面边坡的有所降低,但边坡几何和物理参数取一定范围内的值时,两种趋于一致;(3)坡面顶部的位移拐点和坡体塑性应变区贯通之间并不是同时出现,土体边坡稳定性评价的不同判别准则之间存在差异。建议实际工程中边坡稳定性评价考虑采用双面边坡甚至更复杂边坡分析模型,同时需综合利用边坡稳定临界状态的不同判别准则。
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| 关 键 词： | 有限元 强度折减法 安全系数 双面边坡 塑性应变区 |
| 收稿时间： | 2018-03-03 |
ANALYSIS OF STABILITY OF SINGLE AND DOUBLE SIDE SOIL SLOPES WITH FEM STRENGTH REDUCTION METHOD |
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| GAO Feng,LI Xiaojun,CHI Mingjie.ANALYSIS OF STABILITY OF SINGLE AND DOUBLE SIDE SOIL SLOPES WITH FEM STRENGTH REDUCTION METHOD[J].Journal of Engineering Geology,2020,28(3):650-657. |
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| Authors: | GAO Feng LI Xiaojun CHI Mingjie |
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| Institution: | ①.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China②.China Earthquake Disaster Prevention Center, Beijing 100029, China③.College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China |
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| Abstract: | The stability of single and double side slopes is studied with the strength reduction method and the finite element analysis software ABAQUS. Firstly,the feasibility of the method is validated with typical examples. Then the stability of single and double side soil slopes with different slope parameters,including slope angle and height,soil cohesive strength and friction angle,is analyzed by the model simulation. The influencing characteristics and laws of the slope parameters are discussed on the factor of safety for the two kinds of slopes. The occurrence and expansion of soil plastic strain zone are also displayed. The following results are found. (1)The variation of the factor with single slope parameter,slope angle,slope height or soil cohesive strength,soil friction angle is basically consistent and approximately linear. The influence laws on the stability of single and double side slopes are the same. (2)The stability of the double side slope is lower than that of the single side slope. But when the geometric and physical parameters of the slope are within a certain range,the two tend to be consistent. (3)It does not appear at the same time between the inflection point of displacement curve at the top of the slope and the plastic zone of the slope. There are differences between the different criteria for evaluating the stability of the soil slope. It is suggested that double side slope or even more complex slope analysis model should be used for slope stability evaluation in practical engineering,and different critical state criteria of slope stability should be used synthetically. |
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| Keywords: | Finite element Strength reduction method Safety factor Double side slope Plastic strain zone |
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