| 基于分区有限元与块体界面元混合算法的重力坝深层抗滑稳定分析 |
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| 引用本文： | 王凯,李同春,程井.基于分区有限元与块体界面元混合算法的重力坝深层抗滑稳定分析[J].中国农村水利水电,2020(5):98-102. |
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| 作者姓名： | 王凯 李同春 程井 |
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| 作者单位： | 河海大学水利水电学院;河海大学农业工程学院;河海大学水资源高效利用与工程安全国家工程研究中心 |
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| 基金项目： | 国家重点研发计划项目(2018YFC0407102)。 |
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| 摘 要： | 考虑到重力坝沿岩基软弱结构面的深层滑动问题属于典型的局部位移非连续的接触问题,传统算法在求解此类问题上有较大的局限性,采用分区有限元与块体界面元混合算法对某重力坝进行深层抗滑稳定分析。鉴于该算法需预先知道可能的接触面,先采用弹塑性有限元强度折减法搜索出可能的深层滑动面,然后在滑面上生成接触点对。再采用分区有限元与块体界面元混合算法,整体折减滑动面的抗剪断强度参数,定义接触点对全部失效时重力坝失稳,求出抗滑稳定安全系数,并将结果与传统的弹塑性有限元强度折减法计算结果进行比较。结果表明该方法能较好模拟岩基不连续结构面的力学行为,计算效率高,有效避免了弹塑性有限元强度折减法在失稳判据上的人为性。
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| 关 键 词： | 重力坝 深层抗滑 混合算法 失稳判据 |
Deep Sliding Stability Analysis of Gravity Dams Based on the Iterative Method of Partitioned Finite Elements and Interface Boundary Elements |
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| WANG Kai,LI Tong-chun,CHENG Jing.Deep Sliding Stability Analysis of Gravity Dams Based on the Iterative Method of Partitioned Finite Elements and Interface Boundary Elements[J].China Rural Water and Hydropower,2020(5):98-102. |
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| Authors: | WANG Kai LI Tong-chun CHENG Jing |
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| Institution: | (College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;College of Agricultural Engineering,Hohai University,Nanjing 210098,China;National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety,Hohai University,Nanjing 210098,China) |
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| Abstract: | Considering that the deep sliding problem of gravity dam along the rock bed's weak structural surface belongs to the typical local displacement non-continuous contact problem,and the traditional algorithms have limitations on solving this kind of problem,this paper uses the iterative method of partitioned finite elements and interface boundary elements to carry on the deep sliding stability analysis of a certain gravity dam.Given that the iterative method needs to know the possible contact surfaces in advance,the FEM strength reduction method is firstly used to search the possible deep sliding surface,and then nodal pairs are generated on the sliding surface.The iterative method of partitioned finite elements and interface boundary elements combined with strength reduction method is applied to calculate the safety factor by defining the states of all nodal pairs at the failure states.Meanwhile,the result of the proposed method is compared with that of the traditional FEM strength reduction method.It shows that this method can simulate the mechanical behavior well of discontinuous structural surface with high computational efficiency,and can effectively avoid the subjectivity in determining safety factors with the FEM strength reduction method. |
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| Keywords: | gravity dam deep sliding stability iterative method failure criterion |
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