不同采高影响下工作面侧向支承压力分布规律研究

Study on distribution laws of side abutment pressure of coal mining face under effects of different mining height

针对综采面巷道的布置位置以及沿空掘巷煤柱的合理留设与围岩支护设计等问题,以山西煤运集团和顺益德煤矿为工程背景,采用极限平衡理论计算与FLAC3D数值模拟相互结合、互相验证的方法,研究了综采工作面一次采全高过程中采高对工作面侧向支承压力峰值大小及峰值位置距巷帮距离的影响。研究表明:随着采高的增大,工作面侧向支承压力峰值呈现减小的趋势,在不考虑开采扰动系数的情况下,峰值位置距巷帮距离与采高基本呈线性正比关系。由于开采扰动系数的影响,数值模拟与理论计算的差异得到了合理的解释,并反向验证了理论计算与数值模拟结果的准确性,对实际工作面巷道的布置位置以及沿空掘巷煤柱的合理留设与围岩支护设计提供参考依据。

According to the layout of the fully-mechanized roadway,the reasonable retent ion of the pillar for gob-side entry driving,and the design of surrounding rock supporting, taking Heshunyide Coal Mine of Shanxi Coal Transportation and Sales Group as engineering background,combined with the numerical theory of limit equilibrium calculation and FLAC3D simulation method,the influences of min-ing height on peak value of side abutment pressure on working face and the distance between the position of peak value and sides of roadway. Results show that ： with the in crea sin g of th e mining h e ig h t , th e side abutment p re s su re peak showed a slow d ec rea sing trend ; if mining disturbance coefficient is ignored, the distance between the position of peak value and sides of roadway is linear to mining height. When considering the mining disturbance coefficient, the difference between theoretical calculation and numerical simulation re-sults can be explained reasonably, and the accuracy of theoretical calculation and numerical simulation results were verified by the theo-retical calculation and numerical simulation, Which can provide reference for the rational location of roadway on working face and the reasonable retention of the coal pillar for gob-side entry driving.