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地质强度指数GSI是近些年广泛采用的岩体特征描述系统,其主要应用是结合霍克-布朗强度准则获取裂隙岩体的强度及变形参数.本文概括了GSI的几种量测、估算方法,探讨了应用中存在的问题,根据Hoek-Diederichs公式建立了直观的岩体变形模量估算表.以搜集的50组现场原位试验成果为基础,分析了不同扰动系数下估算结果和试验值的关系.结果表明,当采用在勘探平硐内获得的GSI估算岩体变形模量时,岩体扰动系数D取0.25能够获得与试验结果高度吻合的预测值.表明此条件下岩体受扰动程度可用D=0.25来反映,这一结论是对如何选取扰动系数D的重要补充.
The Geological Intensity Index (GSI) is a rock mass characterization system widely used in recent years, and its main application is to obtain the strength and deformation parameters of fractured rock mass based on the Hawk-Brown strength criterion.This paper summarizes several GSI measurements and estimation methods , Discussed the problems in the application and established an intuitive estimate table of deformation modulus of rock mass based on the Hoek-Diederichs formula.According to the collected 50 sets of on-site experimental results in situ, the estimation results under different perturbation coefficients and experimental values The results show that when using the GSI obtained in the exploration adit to estimate the deformation modulus of rock mass, the disturbance coefficient D of the rock mass is taken as 0.25 to get the predicted value which is in good agreement with the experimental results, indicating that the rock mass is disturbed under this condition The degree can be reflected by D = 0.25. This conclusion is an important complement to how to choose the perturbation coefficient D.