Study on the Effect of Different Pressure of Deep Confined Water on Failure of Coal Seam Floor
In this paper, under the conditions of specific engineering geology, hydrogeology and mining technology, numerical analysis methods and solidliquid coupling modes are applied to study the differences of pressure from confined water on the deformation and failure of coal floor. The following conclusions can be obtained. The failure depth of coal floor depends on the exposed worked-out section after face mining, and increases with the increasing mining distance of working face. But there is limit on the impact of space exploration. When the mining area reaches to the cap, the macroscopical influence of mining parameters on failure depth begin to weaken, even to be unrelated. The pressure of confined water on coal seam floor has different effects on failure of the direct rock stratum floor and in situ rock at the bottom of impermeable layer. In the simulation conditions, when the pressure of confined water reaches to 2MPa, only the direct floor caused the failure, and failure depth ranges at 26m~ 40m; when the hydraulic pressure reaches to 3MPa, different sizes of cracking failure at the bottom of water-resisting layer have also occured in addition to direct floor, and the thickness of the cracking failure will further increase when the hydraulic pressure and the advancing steps of working face are also large, resulting in further failure of the corresponding rock mass. There is a nonlinear function between maximum failure depth of coal floor and hydraulic pressure of confined water. The main failure form of coal floor is caused by extension, sometimes by shear. The failure patterns are similar to the inversion of the saddle, and the location of the maximum failure depth appears to be around the rib of work-out section. So it is suggested that pressure observation of mine should be enhanced to ensure mine safety during initial and periodic pressure of main roof. Researches provide some theoretical guidance to the mining of high pressure of confined water.
High confined water Soidli-quid coupling Differences Simulation
ZHANG Peisen ZHANG Wenquan YAN Wei
CREE of Shandong University of Science and Technology Shandong Qingdao PRC 266510 Key Laboratory of Mine Disaster Prevention and Control Qingdao Shandong PRC 266510
国际会议
2010 International Conference on Mine Hazards Prevention and Control(第二届矿山灾害预防与控制国际学术会议 ICMHPC)
青岛
英文
103-111
2010-10-15（万方平台首次上网日期，不代表论文的发表时间）