中文摘要：

变形模量作为表征岩体变形特征的重要参数，是岩体工程设计的基础力学参数之一。在综合前人研究的基础上提出了基于三维结构面网络模拟确定岩体变形模量的方法，编制了三维结构面网络模拟及计算 RQD 值的程序。以西南山区某水电站坝址区岩体为实例，在概率统计各组优势结构面几何要素分布形式的基础上，采用Monte Carlo法生成三维结构面网络模型，据此获得岩体三维RQD值，利用RMR法进行质量评价和变形模量的确定，并与钻孔资料统计法和原位试验结果进行对比分析。结果表明：基于钻孔资料统计的估算结果与原位试验相对误差达31.62%，且其估算值偏低；基于三维结构面网络模拟的估算结果与原位试验相对误差仅为2.56%，估算结果精度较高。该方法考虑了岩体质量的空间各向异性，对岩体的质量评价和参数确定更为合理，研究成果为该工程的优化设计提供了合理的计算参数。

英文摘要：

As an important parameter to characterize the deformation characteristics of the rock mass, deformation modulus is one of the basic mechanical parameters in rock mass engineering design. Based on previous studies, a method in determining rock mass modulus of deformation is proposed on the basis of three-dimensional disconti-nuity network simulation method, and then a three-dimensional network simulation program and a RQD values calculation program were completed. Taking the rock mass in a hydropower station dam area located in the south-west of China as an example, a three-dimensional discontinuity network model was generated by using the Monte Carlo method, based on the distribution form of geometric elements of each preponderant discontinuities group from statistical analysis, and thereby obtained three-dimensional RQD values of rock mass. Deformation modulus and the quality of dam area rock mass were then evaluated and compared to drilling data statistics method and in-situ test. The results showed that the relative error between the estimation result based on drilling data statistics and the result of in-situ test is up to 31.62%; the relative error between the estimation result based on three-dimensional network simulation and the result of in-situ test is only 2.56%.This method takes into account of the spatial anisotropy of rock mass quality, which provides a more reasonable evaluation for the rock mass quality and parameter determination, and meanwhile provides reasonable mechanical parameters for optimization design of the project.