基于ABAQUS二次开发平台的边坡有限元强度折减法研究

发布时间：2018-11-07 09:29

【摘要】：有限元强度折减法在边坡稳定性分析中发挥着举足轻重的作用,但通常的有限元强度折减法采用二分法来获取边坡的安全系数,该方法需要多次试算,效率较低。本文借助ABAQUS软件的二次开发平台UFIELD程序,将软件自带的场变量定义为折减系数,建立场变量分别与软件求解时步和强度参数的关系,方便地实现了基于场变量的边坡有限元强度折减法,此方法仅需一次提交计算分析便可高效地实现边坡安全系数的求解;在基于场变量的边坡有限元强度折减法基础上,依据滑面位置处的等效塑性应变最大这一基本原理,利用不同垂直剖面逐点搜索法,实现了基于最大等效塑性应变的边坡潜在滑动面位置精细化寻找;最后借助两个经典算例,将此套思路确定的潜在滑动面位置、安全系数分别与传统极限平衡M-P法的对应结果进行对比分析,验证了本文思路和方法的有效性。
[Abstract]:The finite element strength reduction method plays an important role in the slope stability analysis, but the common finite element strength reduction method uses dichotomy to obtain the slope safety factor. In this paper, with the help of the UFIELD program of the secondary development platform of ABAQUS software, the field variable is defined as the reduction coefficient, and the relationship between the field variable and the time step and strength parameter of the software is established. The finite element strength reduction method of slope based on field variable is realized conveniently. This method can efficiently solve the slope safety factor only by submitting calculation and analysis once. Based on the finite element strength reduction method of slope based on field variables and the principle of maximum equivalent plastic strain at the position of sliding surface, the point by point search method of different vertical profiles is used. Based on the maximum equivalent plastic strain, the potential sliding surface location of the slope is finely searched. Finally, with the aid of two classical examples, the potential sliding surface position and safety factor determined by this set of ideas are compared with the corresponding results of the traditional limit equilibrium M-P method, and the validity of the method is verified.
【作者单位】：西安理工大学理学院;西安理工大学岩土工程研究所;
【基金】：国家自然科学基金资助项目(51679199) 水利部公益性行业科研专项基金资助项目(201501034-04) 陕西省科技统筹创新工程重点实验室资助项目(2014SZS15-Z01)
【分类号】：TU43

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