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| DETERMINATION OF SHEAR STRENGTH REDUCTION FACTOR FOR GENERALIZED HOEK-BROWN CRITERION |
| SONG Kun1，YAN Echuan1，2，MAO Wei1，ZHANG Tingting1 |
| (1. Faculty of Engineering，China University of Geosciences，Wuhan，Hubei 430074，China；2. Three Gorges Research Center for Geo-hazard，Ministry of Education，China University of Geosciences，Wuhan，Hubei 430074，China) |
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Abstract Factor of safety is a key indicator and the shear strength reduction method is currently very popular for evaluating rock slope stability. But for reduction technique of the nonlinear generalized Hoek-Brown criterion (2002)，the standard is not unified or with complex calculation. Taking Shizibao high rock slope in the Three Gorges area for example，8 models were established by changing the height，angle and parameters of the slope. And the stability was evaluated by seven reduction technique schemes，which were the combination by reduction of the three parameters，i. e. uniaxial compressive strength of intact rock ?ci，geological strength index GSI，and material constant of intact rock mi. Then the relative errors of the seven schemes were analyzed；and the shear strength reduction factor was obtained for the generalized Hoek-Brown criterion. The result shows that the factor of safety can be obtained by reduction of the two parameters ?ci and GSI in the same rate for the generalized Hoek-Brown criterion. The factor of safety by shear strength reduction method is similar to that by the limit equilibrium method，Morgenstern-Price. And the average relative error of factor of safety is 6.9%；the variance is 6.9%；and the shear strength relative error is 4.98%. The result has some theoretical value for the wide application of the generalized Hoek-Brown criterion to the rock slope stability evaluation.
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Received: 16 May 2011
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2012, Vol. 31 
