带压开采底板变形破坏规律的三维相似模拟研究

THREE-DIMENSIONAL SIMULATION STUDY ON LAW OF DEFORMATION AND BREAKAGE OF COAL FLOOR ON MINING ABOVE AQUIFER

提出了围岩应力场及渗流场耦合作用的相似理论,研制了部分典型材料的固–流耦合相似配比,研制了三维固–流耦合相似模拟试验台,完善配套了加载系统、测试系统、开采系统和渗流场的模拟与测试系统。采用大型三维固–流耦合模拟试验台对太原市东山煤矿一采区带压开采进行了模拟,得出了一系列的规律及结论。重点讨论了煤层底板的应力、位移随工作面开采的变化规律;得出煤层底板的应力、位移一直处于动态变化过程,分析了其变化的频度与幅度及其原因,为带压开采突水防治提供理论依据。

The similarity theory on coupling of solid and liquid is put forward; and a part of type simulation material has been made. The similarity modeling resemble simulation experiment equipment of 3D coupling on solid and liquid is originated; and the loading system, testing system, mining system, flow area simulation and its testing system have been perfected. Then, using the 3D solid-liquid coupling simulation bedstead, the law for deformation and breakage of coal floor on mining above aquifer of Dongshan Colliery, Taiyuan, has been studied. The law of deformation and the breakage of coal floor vary with coal mining are discussed. The stress and deformation of coal floor are changed dynamically. And the varying frequency, the range of stress and deformation have been analyzed. It provides theoretical foundation for coal mining above aquifer.