谦比希矿深部开采隔离矿柱稳定性分析

 隔离矿柱是地下开采矿山浅部转深部开采的衔接部分，其合理尺寸选择及其稳定性对深部开采安全极其重要。针对谦比希矿浅部转深部开采的实际情况，采用极限跨度法、经验公式法以及极限平衡分析方法，对原设计的隔离矿柱尺寸进行验算，提出合理的隔离矿柱厚度为21 m；根据隔离矿柱尺寸，修正原隔离矿柱留设方案，对所修正的方案应用FLAC3D对其稳定性进行分析计算。结果表明，当隔离矿柱下部回采高度达到33 m时，此隔离矿柱将完全失去其稳定性，而此时在深部开采采用无底柱分段崩落法回采时，其覆盖层厚度已达到28 m以上，这就不能对深部无底柱分段崩落法开采的采场内人员和设备安全造成威胁，满足浅部转深部开采平稳过渡安全生产要求，为谦比希矿隔离矿柱设计与施工提供依据和指导，同时也为相关矿山的浅部向深部开采平稳过渡提供一定的借鉴意义。

STABILITY ANALYSIS OF INSULATING PILLAR OF EXCAVATION OF CHAMBISHI COPPER MINE IN DEPTH

The appropriate size and stability of insulating pillar，which are transition stretch shifting from shallow excavation to deep mining，are very important for safe production of deep mine. According to the field engineering condition shifting from shallow excavation to deep mining，the appropriate size of insulating pillar is calculated and analyzed by using methods of limit span mechanism，empirical equation method and limit equilibrium method. The analysis result shows that for guaranteeing the insulating pillar stability the thickness of insulating pillar is 21 m. According to insulating pillar with thickness of 21 m，original design scheme is revised. FLAC3D is adopted to analyze the stability of revised design scheme，deformation and failure process of insulating pillar during caving. The numerical result shows that when mine is excavated 33 m high under insulating pillar，the insulating pillar will lose its strength and fail. Meanwhile，thickness of 28 m overburden layer is safe for non-hollow sublevel caving，which can guarantee the safety of personnel and equipment. It validates the revised insulating pillar thickness and conducts the production，which will supply the empirical method for the similar mine.