Department of Mining and Design, Tiandi Science and Technology Company Limited

为得到干河煤矿工作面压架事故的原因,利用顶板动态监测系统实时监测支架工作阻力,依据矿压理论分析工作面压架前后支架初撑力、循环末阻力、安全阀开启率的变化情况,同时采用工程力学基本原理分析了掩护梁受力情况。分析表明压架事故的主要原因为:工作面推进速度缓慢,支架处于长时间高负载状态;支架间安全阀设定值相差较大;顶板下沉量大,采高显著降低,支架掩护梁受剪切力显著增加;工作面上覆砂岩裂隙水致使工作面顶板岩层间摩擦因数降低,加剧工作面矿压显现程度。针对以上原因提出了优化支架设计,加强工作面水文及矿压观测,加强工作面顶板管理,提高推进速度等措施。

In order to obtain the causes on the crushed accident of the hydraulic support in the coal mining face of Ganhe Mine, a roof dynamic monitoring and mea suring system was applied to timely monitor and measure the working resistance of the hydraulic support. In accordance with a mine strata pressure theory, the variatio n conditions of the initial support force of the powered support, the terminal resistance of the circulation and the open rate of safety valve before and after the powered support crushed and the stressed condition of the shield beam was analyzed with the basic principle of the engineering mechanics. The analysis showed that the main C auses of the powered support crushed accident were a slow pushing forward speed of the coal mining face and the powered support long timely in a high loading statu s. The difference of the safety valve set values between the powered supports was high. A high roof subsidence value caused a cutting height obviously reduced and th e shearing force of the powered support shield beam obvious increased. The crack water of the sandstone in the overburden strata above the coal mining face would m ake a frictional cofficient reduced between the roof strata above the coal mining face and would intensify the mine strata pressure behavior degree of the coal mining f ace. According to the above causes, an optimized powered support design was provided, a hydrogeological and mine strata pressure observation of the coal mining fac e was intensified, a roof control of the coal mining face, the face pushing forward speed increased and other measures were enhanced.

“十二五”国家科技支撑计划资助项目(2012BAB13B02-02)；开采设计事业部青年创新基金资助项目(KC-QNCX-2012-02)；