基于有限元直接反力法的坝肩动力抗滑稳定分析研究
首发时间:2017-06-07
摘要:拱坝基础稳定安全评价是拱坝设计的关键。传统三维刚体极限平衡方法无论在概念上还是求解方法上,存在较大局限性,不能反映坝肩抗力体失稳的实际情况和机理。多重网格法是基于非线性静动力有限元分析的抗滑稳定分析方法,但基于应力积分法获取滑面合力的方法不能精确满足内力平衡条件且受网格尺度影响较大。鉴于有限元直接反力法可以精确获取滑面内力,本文提出一种基于有限元直接反力法-刚体极限平衡法相结合用于求解坝肩块体动力安全系数方法;相比多重网格法,该方法能够精确获取滑面合力且滑面不依赖于网格具体划分形式影响。经工程实例验证,该方法计算结果合理,具有较好工程实用性,为坝肩稳定分析提供了一条新的思路。
关键词: 有限元直接反应法 刚体极限平衡 时程分析 动力抗滑
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Study on Dynamic Analysis of stability against Sliding of Dam Abutment Based on Finite Element Direct Force Method
Abstract:Safety Evaluation of arch dam foundation stability is the key to arch dam design. As for the traditional three - dimensional rigid body limit equilibrium method , there is a big limitation on both the concept and the calculation, so it could not reflect the actual situation or the mechanism of instability of dam abutment resisting force body. Multigrid method is a method based on Nonlinear Static and Dynamic Finite Element Analysis. However, the way to get the slip surface force based on the stress-integration method could not meet the internal force equilibrium conditions and it is greatly influenced by the grid scale. Given the fact that the finite element direct force method could accurately obtain the internal force of sliding surface, a method used for getting dynamic safety factor of abutment blocks is proposed based on the combination of the Finite Element Direct Force Method and the rigid body Limit Equilibrium Method. Compared with multigrid method, it could accurately obtain the sliding surface forces without the influence of grid specific form on the sliding surface. Verified by practical engineering, the result showed that the method is reasonable and has good practicability, proving a new thought to dam abutment stability analysis.
Keywords: Finite Element Direct Force Method Rigid Body Limit Equilibrium Time History Analysis Dynamical Anti-Sliding
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No.4736541120527214****
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