沿空巷旁分层充填留巷试验研究

煤矿目前在高地应力或覆岩运动剧烈的条件下，采用巷旁充填留巷方式有2点不足：刚性材料充填易造成墙体应力集中，使充填体被压裂乃至失效，裂隙发育使采空区与巷道连通引起火灾或CH4，CO等有毒有害气体泄漏；柔性材料充填易造成巷内顶板下沉过大乃至发生冒顶。为此，在华恒煤矿11508运输巷留巷时进行改进。首先建立沿空留巷巷旁侧向覆岩结构模型，计算充填体可缩量，制定巷旁分层充填留巷方案：即巷旁支护体采用2种强度等级的材料充填，上分层材料起密封作用，适应覆岩运动产生的冲击载荷，下分层材料起支护作用。通过建立力学模型计算得出下分层材料必需的支承强度，通过结构模型确定各自充填厚度。现场试验达到了预期效果。

EXPERIMENTAL RESEARCH ON GOB-SIDE ENTRY RETAINING SUPPORTED BY FILLING TWO MATERIALS

Gob-side entry retaining by filling has two shortcomings in high stress or encountering overlying strata violent movement，i.e. rigid material filling easily lead to packing wall stress concentration，even fractured or failure，caused fire or CO，CH4 leakage，and flexible material filling easily lead to roof cave-sink too large and even the occurrence of roof fall. In order to solve the problems，filling method was improved in Huaheng coal mine. Based on the study on the overburden stratum movement process and structure morphological characteristics above gob-side entry retaining，we calculated the amount of compression of the filling body，and two strength grades of roadway supports of gob-side entry retaining were design：the upper filler is high expansion to firmly seal the gap，and adapting impact load of the main roof movement；the lower filler strength support specific roof. Based on mechanical model established，the lower filler strength is calculated；Based on structure model established，the lower filler strength is calculated. Mineral pressure observation showed that the design of gob-side entry retaining met the application requirements.