大断面综放沿空巷道煤柱合理宽度研究

Width Determination of Coal Pillars of Large Section Gob-side Entry Driving in Fully Mechanized Working Face

为达到保证沿空巷道围岩稳定性情况下避免煤炭资源的浪费的目的,以王家岭煤矿20102采区地质条件为研究背景,以偏应力在巷道围岩中的分布为标准,分析数值模拟不同煤柱宽度下的计算结果,结合理论计算确定大断面综放巷道煤柱合理宽度。分析结果可知,随煤柱宽度的减小,煤柱承载能力降低,煤柱顶板中偏应力第二不变量峰值向实体煤方向转移,煤柱顶板中偏应力第三不变量由负值向正值转化,应变类型由拉应变转化为压应变最终向平面应变转化,最终确定20102区段合理煤柱宽度为8.0m,为大断面强采动综放煤巷围岩控制提供了基础数据。

To avoid the waste of coal resources and ensure the stability of surrounding rock of gob-side entry driving,the study took the geological condition of the 20102 mining area in Wangjialing Mine as the background.The deviatoric stress distribution in the surrounding rocks was used as the standard to simulate the calculation results under different coal pillar widths and to determine the reasonable width of coal pillars in the large-section gob-side entry driving in fully mechanized working face.The results showed that,with the decrease of coal pillars width,their bearing capacity dropped too.The peak of the second invariant of the deviatoric stress transferred to coal mass and the third invariant changed from negative to positive value.The deformation types also changed from tensile strain to compression strain,and finally to plain strain.The reasonable size of the coal pillars was determined to be 8.0 meters.The study provided basic data for the surrounding rock control in the large section strong mining.