(1. Geotechnical and Structural Engineering Research Center，Shandong University，Jinan，Shandong 250061，China；2. Hubei Key Laboratory of Roadway，Bridge and Structure Engineering，Wuhan University of Technology，Wuhan，Hubei 430070，China；
3. Dagangshan Hydropower Development Co.，Ltd.，China Guodian Corporation，Shimian，Sichuan 625400，China)
Abstract：
Abstract：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.
龚晓南. 对岩土工程数值分析的几点思考[J]. 岩土力学，2011，32(2)：321-325.(GONG Xiaonan. Reflections on numerical analysis of geotechnical engineering[J]. Rock and Soil Mechanics，2011，32(2)：321-325.(in Chinese))
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2014, Vol. 33 
