基于Mathews稳定图等方法的多角度采空区群稳定性分析评价

Mathews-stability-method-based multi-angle analysis and evaluation of mined-out zones stability

红岭铅锌矿3中段以上矿房全部采空,遗留大量采空区,危险性非常高,为保证后续回采活动的安全,必须进行采空区群的稳定性分析。首先利用先进数字摄影测量技术,大规模获取岩体结构面参数,从工程岩体地质角度(BQ,RMR)进行岩体稳定性的初步评价;其次建立结构面三维离散裂隙网络模型,从三维数值模拟角度研究围岩的切割破碎程度;再者应用Mathews稳定图方法,从工程经验角度进行上盘围岩稳定性的研究。研究将常规地质方法、数值模拟和工程经验方法相结合,层层递进,多角度准确、全面地获得了复杂采空区群的稳定性分析结果,以及不同岩性围岩所对应的稳定和破坏区域,研究结果对于指导矿山安全回采具有重要意义。

Stopes at the third mid-piece and above of Hongling Lead-Zinc Mine have been mined out, leaving number of goafs of high risk without management. In order to ensure the safety of subsequent mining activities, stability of the mined-out areas has been analyzed in three steps. First, spatial geomet- ric parameters of the structural planes is gained with the advanced photogrammetry, and the preliminary stability evaluation of rock mass from the point of engineering geologic （BQ, RMR） was conducted. Second, the discrete crack network model of structural surface was built to analyze the degree of crush- ing in surrounding rock from the point of numerical simulation. Third, the stability of the upper sur- rounding rock was studied from the point of engineering experience based on Mathews stability method. Combining regular geological method with numerical simulation and engineering experience, the research multi-angle layer-layer progressive, this method obtained the accurate and comprehensive analysis results of continuous mined-out zones stability, as well as the corresponding stability and damage area in surrounding rock with different properties. The research result has significant guidance value to safe mining.