大倾角煤层工作面采场围岩矿压分布规律光弹性模量拟模型试验及现场实测研究

PHOTO-ElASTIC EXPERIMENTAL AND FIELD MEASUREMENT STUDY OF GROUND PRESSURE OF SURROUNDING ROCK OF LARGE DIP ANGLE WORKING COALFACE

以平煤集团香山矿戊9-0-22090大倾角煤层工作面为工程背景,通过室内光弹性模拟模型试验和工作面现场矿压实测,对大倾角煤层工作面开采后采场围岩矿压分布规律进行研究。光弹试验和现场实测结果表明:倾角对煤层工作面开挖后采场围岩应力分布、支承压力的分布有显著影响。大倾角煤层工作面开采后,采场顶板岩层的变形、破坏和运动形式不同于一般缓倾斜煤层工作面,采场支架载荷的分布、来压显现程度、来压步距沿采场倾斜方向均不同。工作面煤层开采后,采场顶板应力分布是高度不均匀、不对称的,在采空区两侧保护煤柱角高度集中,形成支承压力区,采空区上方形成支承卸压区。采场顶底板应力释放,两侧煤柱出现应力集中,采场四个角部位出现较大剪应力。剪切应变主要出现在采场下端部顶板和上端部的底板,而体积应变主要出现在煤层较近顶板和两侧煤柱。研究成果,对香山矿和类似条件下大倾角炮采煤层工作面的开采和顶板的支护的优化和管理具有一定的指导意义。

Based on the large dip angle coal working face ofWU9 - 0 - 22090 of Xiangshan mine of Pingdingshan Coal and Electricity Co., Ltd., the ground pressure distribution laws of surrounding rock is studied through photo-elastic stimulation experiment and field measurement after coal mining. The research results show that the angle has an important effect on the distribution of the stress and bearing pressure of surrounding rock after coal mining, the deformation behavior, destroy characteristic and moving laws of stope roof of large dip angle coal working face are different with usual inclined working weighting presentation degree and the weighting distance coal face; and the distribution of prop loading, me are all different along the inclination of stope, and the distribution of roof stress is high nonuniform and asymmetrical. The roof stress is apparently concentrated in the two sides protected pillars＇ comer ofgoaf; then the bearing pressure region is formatted; and the pressure relieved region in the goaf of coal working face is also generated. The stress of stope roof relieved and the stress of two sides protected pillars are high concentrated; the shear stress of the four comers of stope apparently increased. And the shear strain mainly appeared in the roof of the low part of coalface and the floor of the upper part of coalface; the bulk strain is mainly focused in the adjacent coal roof and the two sides protected pillars. The research results are of significance in coal mining and roof management and enhancement of Xiangshan and similar coal mines.