Modification of Hoek-Brown criterion and its application
LI Shuobiao1，2，XUE Yadong1，2
(1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University， Shanghai 200092，China；2. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China)
Abstract：Hoek-Brown failure criterion has prominent advantages. However，when using the criterion，it is difficult to accurately obtain disturbed factor D and geological strength index GSI-value，that are the two main parameters in the criterion. According to this，This paper puts forward a convenient and accurate method to determine the two parameters，after summary analyzing scholars improvements of the traditional Hoek-Brown criterion. To get the disturbed factor D，this paper uses the square of ration between P-wave velocity of rock mass and rock. Then to obtain the GSI-value，this paper uses the relationship between the P-wave and rock mass rating RMR-value. Further，This paper puts the formulas of D and GSI into Hoek-Brown criterion to obtain a new modified criterion. In order to verify the modified criterion is reasonable，rock mass physical-mechanical parameters are respectively calculated by modified criterion and Hoek-Brown criterion for comparison，basing on the Yellow River Maerdang hydropower station dam foundation rock mass engineering case. The results of the two criterions show the same trend and the numeral difference is very small. Therefore，the modified criterion can satisfy the engineering application. Especially，it can be used to quickly and accurately calculate the two main parameters in Hoek-Brown criterion，and then calculate the mechanical parameters of rock mass.
李硕标1，2，薛亚东1，2. Hoek-Brown准则改进及应用[J]. 岩石力学与工程学报, 2016, 35(S1): 2732-2738.
LI Shuobiao1，2，XUE Yadong1，2. Modification of Hoek-Brown criterion and its application. , 2016, 35(S1): 2732-2738.
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2016, Vol. 35 
