基于岩体力学分类法的岩体经验强度指标确立

Determination of Rock Strength Indicators Based on Rock Mass Mechanics Classification Method

利用RMR的定义、GSI与RMR的关系,采用经验分析方法对GSI进行量化。根据量化后GSI值和矿山边坡扰动系数,确定了广义Hoke-Brown准则中的各项参数,并运用Mohr-Coulomb强度准则对Hoke-Brown曲线进行线性拟合,得到岩体经验强度参数内聚力Cm和内摩擦角m,并对紫金山金铜矿岩体进行了计算和分析。结果表明,计算结果符合经验规律,英安玢岩强度最高,构造角砾岩岩性最差,同时地开石蚀变使得岩性强度大打折扣。方法和结果对采场边坡稳定性分析具有指导意义。

GSI quantification is done by using empirical analysis method and based on the definition of RMR and the relationship between GSI and RMR. The parameters of broad Hoke-Brown guideline are determined based on the GSI value after quantification operation and disturbance factor of mine slope. According to Mohr-Coulomb strength guideline, the Hoke-Brown curve fitting is done, and the cohesion Cm and internal friction angle Φm are obtained, and the calculation and analysis of the rock mass of Zijinshan Au-Cu orebody are conducted. The study results show that the calculation results is consistent to the empirical regularities, the strength of dacite-porphyrite is highest than other rock mass, the lithology of tectonic breccia is the worst, besides that, the lithology strength of dickite is reduced significantly by the existence of alteration. The method and result have guiding significance for stability analysis of stope slope.