平顶山东部矿区深井动力灾害多因素耦合统一灾变机理

Multi-factor Coupling Unified Catastrophic Mechanism of Dynamic Disasters in Deep Mine in Eastern Mining Area of Pingdingshan Coal Mining Group

冲击地压、煤与瓦斯突出两者的强度理论本质上是类似的,两者的孕育过程也是相似的,但发生的能量来源和过程有较大区别。平顶山东部矿区深井动力灾害受区内褶曲、断层、构造煤及煤层瓦斯等多因素控制,在采掘过程中,构造应力、瓦斯压力与采动应力相互耦合,煤岩固体骨架有效应力的改变导致了孔隙率变化,结果使瓦斯压力改变,进而影响到煤层瓦斯运动。瓦斯在煤层中迁移时,孔隙压力变化引起固体骨架变形,反映了煤体变形与孔隙压力变化的相互关系。围绕平顶山东部矿区深部开采矿井动力灾害问题开展研究工作,分析各类矿井动力灾害发生的机理和动力源,确定了平顶山东部矿区煤样冲击倾向性等级,揭示出深井动力灾害的多因素耦合统一灾变机理,建立了统一的数学模型。

The strength theory of both rock burst and coal and gas outburst is essentially similar,and the inoculating process of them is also the same,but the energy source and process of their occurrence are vary difference.The dynamic disasters occurred in deep mines in Eastern Pingdingshan mining area were controlled by many factors including the folds,faults,the tectonic coal and coal-bed gas,and in the mining process,the tectonic stress,gas pressure and the mining stress were mutually coupled,the change of the effective stress in the solid skeleton of coal/rock body led to the change of its porosity,which then made the gas pressure change and affected the gas migration.When gas migrated in coal seam,the change of pore pressure caused deformation of the solid skeleton,which reflected the relation between coal body deformation and pore pressure change.In this paper,research on the dynamic disasters occurred in deep mines in eastern Pingdingshan mining area was carried out,the occurrence mechanism and power source of dynamic disasters in various kinds of mines were analyzed,the burst tendency and grade of coal samples taken from eastern Pingdingshan mining area were determined,the multi-factor coupling unified catastrophic mechanism of dynamic disasters was revealed and a unified mathematical model was established.