基于扩展的Mathews稳定图法的采场稳定性评价及参数优化

Stability Evaluation and Parameter Optimization of Stope Based on Extended Mathews Stability Graph Method

为了分析大尺寸采场的稳定性并优化采场参数,对森鑫矿业三道桥铅锌矿试验采场进行了现场地质调查、地质编录、室内岩石力学试验等工作,得到了评价矿山岩体质量的多种基础指标。对试验采场矿岩进行了岩体质量分级,并估算了其岩体力学参数。根据取得的结果,利用扩展的Mathews稳定图法对试验采场在当前尺寸下的稳定性进行了分析,试验采场上盘的破坏概率较大,需要进行采场结构参数的优化。基于扩展的Mathews稳定图法对试验采场参数进行优化,利用理论法和数值模拟对优化的结果进行验证。验证的结果与利用扩展的Mathews稳定图法得出的结果一致,最终确定了试验采场需保留顶柱的安全厚度为7 m。

In order to analyze the stability of large-scale stope and optimize the parameters of the stope,field geological survey,geological catalogue and indoor rock mechanics experiment were carried out on the testing stope of Sandaoqiao LeadZinc Mine in Senxin Mining Company,and various basic indexes for evaluating the rock mass quality of the mine were obtained. The rock mass quality classification of the rock mass in the stope is carried out,and the mechanics parameters of the rock mass were estimated. According to the results,the stability of the stope at the current size is analyzed by the extended Mathews stability graph method. The probability of failure of the hanging-wall is large,so it is needed to optimize the stope structure parameters. The test stope parameters are optimized based on the extended Mathews stability graph method,and the optimization results are verified by theoretical methods and numerical simulations,which are consistent with the results obtained by the extended Mathews stability graph method. Hence,the safe thickness of the cap pillar to be retained in the stope is determined to be 7 m.