综采工作面过空巷围岩稳定性的影响因素研究

为了研究不同因素对综采工作面过空巷时围岩稳定性的影响,采用ANSYS软件建立数值模型,分析不同埋深、不同采高、不同空巷宽度下的空巷顶板沉降、煤壁位移和煤柱切向应力的变化规律。研究结果表明:埋深增加对空巷顶板沉降、煤壁位移和煤柱应力都产生不利影响;采高增大对空巷顶板沉降和煤壁位移影响较小,对煤柱内应力分布影响较大;空巷宽度增加会显著破坏空巷顶板稳定性,同时增大煤柱应力,对煤壁位移影响较小;当工作面与空巷距离小于25 m时,随着工作面继续推进,空巷稳定性明显变差,巷道易失稳破坏。

Influence Factors on Surrounding Rock Stability When Fully-Mechanized Working Face Passing through Abandoned Roadway

In order to study the stability of surrounding rock when the fully mechanized mining face passes through abandoned roadways,ANSYS software was used to establish a numerical model to analyze roof settlement,coal wall displacement,and coal pillar tangential stress under different factors,including buried depth,mining height,and abandoned roadway width.The results show that:the increase of the buried depth has adverse effects on the roof settlement,coal wall displacement and coal pillar stress;the increase of the mining height has less influence on the roof settlement and coal wall displacement,but more influence on the stress distribution within coal pillars;the increase of the width of abandoned roadway will significantly damage the stability of the goaf roof,and increase the stress of the coal pillars,but have a less impact on the displacement of the coal wall;when the distance between the working face and the abandoned roadway is less than 25 m,with the continuous advance of working face,the stability of the abandoned roadway becomes worse,and the roadway is prone to instability and destruction.