摘要
In order to solve the problem of rib spalling of high coal walls in fully-mechanized(HCWFM)mines,we used the principle of damage mechanics to analyze coal wall rib spalling.The results show that coal wall rib spalling is,to a certain degree,a macro-performance of the development of micro-cracks.We built a mechanical model to simulate the damage to the front of coal walls,carried out theoretical calculations of the damage parameters,analyzed the effect of mining height,original cracks,seam strength,horizontal stress,vertical displacement of the coal walls and other parameters on coal wall rib spalling, which conform well with the results of our field measurements and numerical simulation.The key to control coal wall rib spalling is to control the development of cracks in coal walls.Accelerating the speed of advancing the working face,improving the setting load of support and the horizontal force of the guard board,strengthening coal walls and other technical measures can effectively reduce the degree of damage to the coal walls and control coal wall rib spalling at HCWFM faces.
为了解决高煤的肋骨spalling的问题,围在充分使机械化(HCWFM)矿,我们使用了损坏力学的原则分析煤墙肋骨spalling。煤墙肋骨spalling是的结果表演到某个度,发展的宏表演微裂缝。我们造了一个机械模型模仿损坏到煤墙的前面,执行了损坏参数的理论计算,在煤墙肋骨spalling上分析了采矿高度,原来的裂缝,缝接强度,水平应力,煤墙的垂直排水量和另外的参数的效果,它与我们的地大小和数字模拟的结果一致很好。控制煤墙肋骨spalling的钥匙是在煤墙中控制裂缝的开发。加速推进工作的脸的速度,改进支持的设定的负担和警卫板的水平力量,加强煤围并且另外的技术措施能有效地在HCWFM脸减少煤墙和控制煤墙肋骨spalling的损坏的度。
基金
provided by the Independent Research Fund(No.SKLCRSM09X02)
the Open Research Fund of the State Key Laboratory of Coal Resources and Safety Mining (No.08KF12)
the Qinglan Project of Jiangsu Province and the Graduate Students Innovation Fund of Colleges and Universities in Jiangsu(No.CX09B_120Z)
