超载过程中高拱坝坝肩推力角的研究

本文采用基于D-P准则的理想弹塑性三维有限元分析以及一种高精度的基于体积积分的拱端推力确定方法,结合国内一个典型的300米级高拱坝三维弹塑性有限元整体分析成果,研究分析了超载过程中拱端推力的非线性重分布规律,以确定拱坝-坝肩非线性相互作用。研究结果表明:高拱坝超载过程中各高程段的推力角均有所增加,这反映了拱坝具有较高超载能力的内在机制,也说明基于刚体极限平衡法的拱坝坝肩稳定分析成果偏于安全。

Study on thrust angles of high arch dam abutment during overloading

In this paper,according to 3D elasto-plastic FEA for arch dam where the D-P criteria is satisfied,a new method based on the high-precision volume integral to compute arch abutment forces is proposed.From the results of 3D FEA of a typical arch dam about 300m height,the non-linear redistribution of arch abutment forces is studied to demonstrate the non-linear interaction of the arch dam abutment.The results show that the thrust angles at different elevations increase during overloading,which reveal the internal mechanism of good performance of arch dam during overloading and the safety factor of the arch dam is underestimated by rigid body limit equilibrium method.