层状岩体强度数值模拟及其讨论

基于大伙房水库输水工程现场地勘数据,引入层理面弱化法及Interface命令法建立层状岩体数值模型.运用FLAC3D软件对层状岩体进行数值模拟分析,重点讨论分析这两种方法数值模拟结果的准确性.计算结果表明:Interface命令法计算的岩体竖向位移虽然缺乏连续性,但其在不同层理面倾角情况下计算的轴压极限强度与理论分析结果基本相同,误差均在10%以内,能够较好地描述层状岩体的破坏规律,为后续及类似层状岩体工程施工提供了参考.

Numerical Simulation and Discussion on Strength of Layered Rockmass

Based on the date as a result of the in-situ geological survey for the Dahuofang Reservoir, a source for water supply, a numerical model of layered rockmass was developed introducing the methods of bedding plane weakening and Interface command. Then, a numerical simulate of the layered rockmass was done using the software FLAC3D with the results analyzed emphasizing the discussion on the accuracy of simulated results by both methods. It was found that although the vertical displacement of rockmass computed by the method of Interface command is discontinuous, the ultimate axial compressive strength is basically the same to that computed by theoretical analysis at different obliquities of bedding plane, with the error both within 10%. So the method of interface command is regarded as the better one to describe the failure conditions of layered rockmass, and it will provide a reference for the construction of subsequent and similar projects of layered rockmass.