向家坝水电站重力坝深层抗滑稳定性研究

Investigation on stability against deep level sliding of Xiangjiaba hydrostation gravity dam

针对重力坝深层抗滑稳定性问题,结合向家坝水利水电工程,采用非线性有限元法与刚体元法,分别对失稳判别准则、数值分析的本构关系选择、安全系数计算方法、坝体体型与深层抗滑稳定性的关系等方面进行了具体研究。通过分析得出,体型对坝体深层稳定性影响较大,塑性区贯通破坏准则与强度储备安全系数法较为适合重力坝深层抗滑稳定分析,数值模拟中的屈服准则宜采用D ruker_Prager型屈服准则中的内切圆准则。最后,对重力坝设计与深层抗滑稳定性分析方法的前景进行了展望。

With regard to stability against deep level sliding of gravity dam, by using nonlinear finite element method and rigid body- spring element method,integrating Xiangjiaba hydro-power project,failure criterion, selection of constitutive relation, calculating methods of safety factor and conformation of gravity dam have been researched. The result indicates that conformation of gravity dam affects stability against deep level sliding observably,continuous-plastic-zone failure criterion and Druker-Prager inscribed cone yield criterion should be used when FEM being adopted, and strength margin safety factor method more suit analysis of stability against deep level sliding. Lastly, the foreground of design and deep level stability analysis method of gravity dam have been put forward.