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岩石的地质强度指标GSI广泛应用于节理岩体的强度参数计算。首先采用定量化的GSI系统确定岩体的峰值强度参数,通过对峰值GSI值进行折减,得到残余地质强度指标GSIr,计算残余强度参数,根据Hoek-Brown强度准则计算节理岩体的抗压及抗拉强度。然后针对四种典型岩体做了峰值和残余强度的计算分析。最后,利用适用于岩石类脆性材料的弹塑性损伤模型,分析模拟残余强度对地下开挖围岩塑性区范围的影响。
Geological strength indicators of rock GSI is widely used in the calculation of strength parameters of jointed rock mass. Firstly, the quantitative GSI system was used to determine the peak strength parameters of the rock mass. The GSI value of the rock mass was deducted to obtain the residual geologic strength index GSIr. The residual strength parameters were calculated. According to the Hoek-Brown strength criterion, tensile strength. Then, the calculation and analysis of peak and residual strength of four typical rock masses are done. Finally, the elastic-plastic damage model suitable for rock-like brittle materials is used to analyze the effect of simulated residual strength on the plastic zone of underground excavation.