水垫塘反拱型底板衬砌结构的非线性分析

反拱型底板的稳定性是实现消能防冲的关键所在，其受力过程表现为一种高度的非线性．为此，采用ANSYS程序中三维非线性弹簧单元模拟锚固钢筋的黏结滑移，接触单元模拟水垫塘底板结构之间的接缝以及底板、拱座与基岩之间的接触面。建立反拱型水垫塘的有限元模型，通过长潭岗水垫塘的工程实例说明了该模拟方法的合理性，并应用该方法对拟建的拉西瓦反拱型水垫塘进行稳定性分析，结果表明，反拱型底板具有较好的受力条件．茸稳定性能够得到保证．

Nonlinear Analysis of the Counter-Arched Slab in Plunge Pool

The stability of counter-arched slab is the key to success or failure of energy dissipation, as its stress procedure is considerably nonlinear. The bond-slip of anchor bar was simulated by using three-dimensional nonlinear spring elements, and the contact elements were used to simulate the slot between the slabs and the interface among the slabs, abutment and foundation. Then the counter-arched plunge pool was analyzed with finite element method, which was validated through the case of Changtangang plunge pool. Furthermore, the stability analysis of Laxiwa counter-arched plunge pool was carried out by the proposed method. The result shows that the counter-arched slab has good stress condition and its stability can be ensured.