断续节理岩体渐进破坏数值模拟方法及等效力学参数的测定

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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.

Key words： rock mechanics fractured rock mass numerical simulation strength parameters deformation modulus

Received: 05 May 2014

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https://rockmech.whrsm.ac.cn/EN/Y2014/V33/I09/1798

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