索风营水电站地下洞室岩体力学参数的位移反分析

Displacement back analysis of rock mechanic parameters of underground grotto of Suofengying Hydraulic Power Plant

利用支持向量机和模拟退火算法对索风营地下洞室岩体的力学参数进行位移反分析,一方面支持向量机代替有限元计算提高了计算分析速度,另一方面用模拟退火算法代替传统的优化算法,避免优化过程中目标函数陷入局部极小值而无法继续寻优的状态,提高了反演的效率精度。利用反演得到的岩体力学参数进行有限元正分析所得位移与现场实测结果更加接近。

Parameters of rockmass of Suofengying Hydraulic Power Plant were derived from displacement back analysis based on the support vector machine and simulated annealing. Firstly the support vector machine was used to substitute the time-consuming finite element analysis, and secondly the simulated annealing was used for the optimization of objective function to avoid that the search fell in one of the minimums and could not go any further when the conventional mathematical optimization methods were employed. The displacement calculated by FEM with parameters obtained from back analysis was close to the measured value.