中文摘要：

工程岩体分级标准一般不考虑工程岩体的本构关系，仅提供黏聚力和内摩擦角，岩石的力学参数及现场小尺度的试验结果也不能直接用于工程计算。针对这一问题，利用岩石及结构面的实测参数建立含随机裂隙的岩体数值模型，模拟裂隙岩体渐进破坏过程，并获取岩体等效力学参数的数值模拟方法。计算结果证实，考虑地应力及卸荷条件下，计算获得的岩体强度参数较基于工程岩体分类体系的经验值高30%～50%，各风化、卸荷区结论一致，数值模拟获得的岩体卸载变形模量与工程实测值反演获得的变形模量一致。采用数值模拟方法获取岩体破坏模式、本构关系及相应的强度、变形参数是可行的。

英文摘要：

The constitutive model is generally not considered in the standard for classification of engineering rock masses which provides only cohesion and friction angle. The mechanical parameters of rock and the results from the small-scale field tests can not be applied to engineering analysis directly. A numerical simulation method with randomly distributed fractures according to the statistical results was established to obtain the equivalent mechanical parameters through simulating the progressive failure of fractured rock mass. Under the condition of the geostress and unloading process,the strength parameters obtained with the numerical method was 30%-50% higher than that from the traditional empirical methods. The results obtained with two methods were in good agreement in both the weathering area and the unloading area. The value of the deformation modulus at unloading obtained with the numerical simulation was very close to one from the inversion analysis. The research indicates that using the numerical method to calculate the failure modes,the constitutive relation,the strength and the deformation parameters of rock mass is feasible.