裂隙岩体参数分区分级法在如美电站中的应用

Application of Partition Grading Method to Fractured Rock at the Tibet Rumei Hydropower Station

结合现行岩体参数研究方法,以西藏如美水电站为背景,通过分区分级裂隙岩体数值模拟等效计算方法,根据该地区边坡岩石的类型、强度及风化程度,裂隙结构面的发育特征和几何特征等因素,对下坝址区裂隙岩体进行了合理的区域划分和数值模拟计算,并与岩体质量评价系统GSI计算结果进行了对比分析,分析发现,两种方法得到的如美水电站下坝址区碎裂岩体参数基本一致,并从两种方法自身理论角度分析了其差异性,虽有差别,但都在允许范围之内,证明其结果是可靠可用的。另外,裂隙岩体参数分区分级法还可以简化数值模型,并能有效地降低运算量,提高了计算精度和速度。

On the basis of Rumei hydropower station in Tibet combined with the current research methods of rock parameters, this work makes numerical simulation and partition grading on the fractured rock mass in the underside dam site through the equivalent computing method of numerical simulation of the partition grading fractured rock mass according to the rock mass type, strength and weathering degree, development characteristics and geometric features of the fracture structure surfaces. After comparing these data with calculation results of the geological evaluation sys- tem GSI, it comes to a conclusion that the parameter results of fractured rocks from these two methods are basically the same. Although there are differences when analyzing from their own theoretical point of view, it is within the per- mission range, which shows that the method suggested in this paper is dependable. Additionally the partition grading method of fractured rock mass can simplify numerical model and effectively reduce the computational cost to improve the calculation accuracy and speed.