高拱坝坝肩稳定分析中拉裂面的作用机理研究  

On working mechanism of tensional surfaces in abutment stability analysis of arch dam

作　　者：杨强[1] 朱玲[1] 刘福深[1] 

机构地区：[1]清华大学,北京100084

出　　处：《水力发电》2005年第7期36-38,54,共4页Water Power

基　　金：国家自然科学基金资助项目(50279016);973课题资助项目(2002CB412708)

摘　　要：在拱坝坝肩稳定分析的刚体极限平衡法里,一般认为滑移体拉裂面完全脱开,不考虑其上的岩体抗力,对高拱坝而言,这种做法可能使稳定分析过于保守。基于三维有限元分析的多重网格分析方法,可以将三维有限元分析成果投影到任一滑面网格上,进而求得其上的应力分布及合力,以及滑面和滑块的安全系数。利用此方法对溪洛渡高拱坝工程的坝肩关键滑块的分析研究表明,直至超载3倍时,虽有部分区域受拉,拉裂面就合力来说仍处于受压状态,故拉裂面提供的抗力在较大荷载变幅内是可资利用的。计算表明计入拉裂面岩体抗拉力后,块体稳定安全度有显著的提高。In this paper, based on the multigrid elasto-plastic FEA, we analyzed Xiluodu arch dam, got the stress distributions of the tension-crack surfaces of C3-blocks during overloading, computed and compared the safety factor of blocks of each load step，analysed the change process of the stress and yield field of sliding surfaces quantificationally, further discussed the mechanism of blocks destabilizing under overloading. The result showed that, during the overloading, some place were broken in tensioncrack surfaces, the area where tensile stress appeared increased and distributed near the dana；the safety factor of blocks increased in the condition of considering the effect of tension-crack surfaces。

关 键 词：刚体极限平衡法 块体 拉裂面 高拱坝 

分 类 号：TU311.2[建筑科学—结构工程] O242.21[理学—计算数学]