两硬浅埋条件下6.0m采高工作面顶板运移规律数值分析

Numerical analysis of roof movement regularity of 6.0 m mining height with at the conditions of two-hard and shallow environment

大采高开采是特厚煤层实现高产高效的主要方式之一。为了确保张家峁煤矿浅埋坚硬煤层和顶板两硬条件下大采高工作面安全高效开采。基于室内岩石力学实验,获得了力学参数,采用三维有限差分计算程序—FLAC3D,计算并分析了浅埋、坚硬煤层顶板条件下大采高开采的顶板运移规律。研究表明,在6.0m大采高开采过程中,随着工作面的推进,超前支承应力不断变化。工作面超前支承压力影响范围变窄、压力峰值向工作面内移,超前支承压力均高于未受采动影响下的状态。这为现场安全开采提供了理论依据。

To secure the safe and efficient mining at the conditions of shallowand hard coal and roof in the first face of Zhangjiamao coal mine with large mining height, the mechanical parameters for accurately building 6.0 m mining height roof migration lawthat are adopted in numerical model is obtained by using rock mechanics experiments,and numerical calculation of 6.0 m mining height is done based on this parameter,numerical simulation analysis of shallow, hard coal seam and roof conditions, roof mining methods migration law.Research suggests that,in the process of mining method with 6.0m height, with the face forward, advanced abutment pressure in roof changes.The scope of abutment pressure becomes narrow,the peak shifts to the working face.The abutment pressure are higher than the value without the influence of mining at the scope of 25m away from rip line.