沙坝水电站高边坡卸荷过程数值仿真

Numerical Simulation of Unloading Progress on High Slope in Shaba Hydropower Station

以贵州省务川沙坝水电站高边坡为例,在地质模型建立与计算参数确定的基础上,采用卸荷岩体力学的方法进行边坡不同开挖高程的数值仿真.根据边坡开挖过程中卸荷百分比大小,划分出强卸荷区、弱卸荷区和非卸荷区,基于此对岩体力学参数进行调整.根据卸荷过程中参数的折减与边界条件的变化进行边坡卸荷过程的动态数值仿真,并与传统有限单元法计算结果进行对比分析.结果表明,基于卸荷岩体力学的动态数值仿真可以反映岩石高边坡在开挖卸荷过程中的地质-力学响应,其结果与工程地质定性分析结果比较吻合,更加符合实际情况.

Taking high cutting slope of Shaba Hydropower station as an example,on the basis of establishing the geological model of high cutting slope and determining the calculation parameters,numerical simulation in the slope cutting process is performed on the basis of unloading rock mechanics method.According to unloading percentage,slope will be divided into high unloaded zone,moderately unloaded zone and non-unloading zone.The mechanical parameters of rock mass are adjusted in each area on this basis.Comparisons are made between numerical simulation based on unload numerical simulation method,in the light of changing boundary condition and parameters reduction in the cutting process,and traditional numerical simulation method to show the unloading rock mass mechanics method is improved as taking account the geological mechanics response,the results between unloading simulation and engineering geological analysis match very well.