防治冲击地压的应力三向化理论研究及应用

Study and Application of Stress Three-Dimensional Theory to Prevention and Control of Mine Pressure Bumping

基于欧拉小挠度理论建立了顶底板压杆稳定模型,煤层卸压将增加顶底板的临界载荷,增加顶底板发生冲击地压的可能性,以此提出了冲击地压治理的应力三向化理论,以济三煤矿163下00工作面为例,对冲击危险区采取了煤层卸压和爆破断底解危措施,通过钻孔窥视仪检验爆破断底的效果,观测孔发生变形、破裂或破碎,证明坚硬底板已经卸压,巷道围岩达到了应力三向化状态。工程实践表明,运用应力三向化理论对冲击危险巷道进行解危,可有效地防治冲击地压。

Based on the Euler deflection theory,a roof and floor pressurized bar stabilization model was established.After the seam pressure released,the critical load of the roof and floor would be increased and the possibility of the mine strata pressure bumping to be occurred would be increased.Therefore,a stress three dimension theory was provided to control the mine pressure bumping.Taking No.163B00 coal mining face in Jisan Mine as an example,the seam pressure releasing,the floor broken with blasting and other danger releasing measures were taken to the mine pressure bumping danger area.With the bore fiberscope to inspect the floor broken effect with blasting and to observe the deformation,breaking and broken of the borehole,it could be verified that the pressure of the hard floor was released and the gateway surrounding rocks were in the stress three dimension status.The engineering practices showed that the stress three dimension theory applied to release the danger of the mine pressure bumping danger gateway could be effectively to prevent and control the mine pressure bumping.