基于直接内力法的拱坝建基面稳定分析  

Stability Analysis for the Base Surfaces of Arch Dams by Direct Internal Force Method

作　　者：杨强[1] 李科峰[1] 薛利军[1] 

机构地区：[1]清华大学,北京100084

出　　处：《水力发电》2007年第10期31-33,66,共4页Water Power

基　　金：国家自然科学基金资助项目(50579026);"973"课题资助项目(2002cb412708)

摘　　要：提出适合分析拱坝建基面等效正应力的直接内力法,结合小湾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、推力角和抗滑安全系数的分布规律。研究结果表明,建基面抗滑安全系数衰减速度低于超载速度,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对拱坝坝肩稳定分析成果偏于安全。The direct internal force method of equivalent normal stress analysis for the base surfaces of arch dams is presented in this paper. From the results of 3D FEA of Xiaowan arch dam, the distribution of arch abutment forces,thrust angles and safety factors is studied. The results show that the decrease velocity of base surfaces anti-slippage safety factors is less than the overloading velocity, and 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.

关 键 词：稳定分析 直接内力法 推力角 超载 拱坝 

分 类 号：O317[理学—一般力学与力学基础] TV642.4[理学—力学]