采空区积水对围岩稳态的影响及防治方法研究

Study of Water Accumulation in Goaf on Steady State of Surrounding Rock and Preventive Measures

采空区积水会改变煤层的力学特性,进而影响采场采动下围岩的应力和变形特征,主要通过数值模拟的方法对采空区积水作用下围岩的应力场和位移场进行分析。研究表明,随着煤体含水程度的增加,工作面开采后形成的应力集中现象减弱,但水平应力对采空区顶底板的挤压作用增强,表现为顶底板移近量的增大,总体上采空区围岩的稳定性随着煤体含水率的增加而减弱,基于此提出了相应的采空区积水防治方法。

The goal water will change the mechanical properties of coal seam, and then affect the stress and deformation characteristics of surrounding rock under mining. The stress field and displacement field of surrounding rock under the effect of water accumulation in the goal are analyzed by numerical simulation. The study shows that with the increase of water content of coal body, the stress concentration after mining face is weakened. However, the effect of horizontal stress on the top and bottom of the goaf is enhanced, which shows the increase of the displacement of the top and bottom. On the whole, the stability of the surrounding rock in the goaf is weakened with the increase of the water content of the coal. Based on this, the corresponding prevention and control method of water accumulation in goaf is put forward.