渗透动水压力对坝基双斜面深层抗滑稳定的影响分析  

Influence of seepage hydrodynamic pressure on deep anti-slip stability of dam foundation along double inclined surface

作　　者：张彦洪[1,2] 柴军瑞[1] 郭松年[2] 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048 [2]甘肃农业大学水利水电工程系,甘肃兰州730070

出　　处：《河北农业大学学报》2012年第1期85-88,共4页Journal of Hebei Agricultural University

基　　金：国家自然基金项目(No.50579092);甘肃省科技厅自然基金项目(No.1010RJZA163)

摘　　要：大坝高水位蓄水运行期间,坝基渗流通道中会出现很大的渗透动水压力。本研究对坝基岩块透水性低的双斜面深层滑动情况,用等安全系数法,分析了滑动面上的动水压力对坝基稳定的影响。计算结果显示,蓄水位一定时,双滑动面上的动水压力对降低抗滑稳定安全系数的影响很小,稳定分析时可以忽略动水压力。分析中还发现,从不同的角度对抗滑力和滑动力组成做不同的处理,会出现不同的稳定性评判结果。基于此结果,本研究可为进一步完善刚体极限平衡法提供理论参考。Abstract. Running of reservoir in high water level will result in a great value of seepage hydro- dynamic pressure moving though fissures in dam foundation. Based on method of constant safe factor, the paper analyzes the relations between hydrodynamic pressure on the double slip sur-face and stability of dam considering low penetrability rock mass on dam foundation. The cal- culating results show that hydrodynamic pressure on slip surfaces has little role to play in the lowdown anti-slip safe factor when reservoir runs at a certain water level. So the hydrodynamicpressure acted on the surface of seepage tunnels in dam foundation rock mass can be neglected in calculating deep anti-slip stability of concrete dam. Moreover, the different discharge for components of both anti-slip and slip forces will figure up a different value of safe factor andthen come to a different evaluation result. So the study may provide theoretie references for im- proving the rigid body limit equilibrium method.

关 键 词：岩石力学 渗透动水压力 安全系数 等安全系数法 双斜面深层滑动 

分 类 号：TV22[水利工程—水工结构工程]