倾斜煤层综放工作面沿空留巷围岩稳定性模拟研究

摘要

Taking the fully-mechanized working face in inclined coal seam as the research object,the dynamic distribution and evo-lution of the surrounding rock stress and displacement of gob-side entry retaining with the coal working face movement as well as the plastic damage of the surrounding rock were numerically simulated to reveal the influences of various conditions on the sur-rounding rock stability,which corresponding to different seam inclination angle,seam thickness,width of roadway-side support, and supporting resistance inside the roadway.The simulation results showed that with the increase of the coal seam inclination angle,two-side vertical stresses in roadways and roof vertical displacement decrease;bottom vertical displacement increases;the horizontal displacement first increases and then decreases;surrounding rock plastic damage of the gob-side entry retaining increa-ses,especially the plastic zone at two sides of the roadway and the bottom increases.At the same distance from the advancing coal working face,the greater the coal seam thickness,the smaller the vertical stresses of the roof and right side,and the larger the displacement of the bottom and left side.With the increase of the width of support beside the roadway,left-side vertical stress increases,and right-side vertical stress first increases and then decreases;the roof vertical displacement and the two-side horizon-tal displacement in roadways decrease,and the bottom vertical displacement increases.With the increase of supporting resistance in-side the roadway,the two-side vertical stresses in roadways increase first and then decrease,and the deformation of the roadway shows opposite trend.And the displacement of the bottom and right side does not change much with the supporting resistance.%以倾斜煤层综放工作面为研究对象，运用数值模拟的方法，对不同煤层倾角、不同煤层厚度、不同巷旁支护体宽度及不同巷内支护阻力时，沿空留巷围岩应力和位移随工作面推进的动态分布和变化规律及围岩的塑性破坏进行了模拟研究，以揭示不同工况条件对巷道围岩稳定性的影响规律。结果表明：随煤层倾角的增大，两帮垂直应力和顶板垂直位移逐渐减小，底板垂直位移逐渐增大，巷道两帮水平位移量先增大后减小，留巷围岩的塑性破坏程度加剧，尤其是巷道两帮及底板塑性区范围增大；在工作面推进相同距离时，煤层厚度越大，两帮垂直应力及顶板和右帮位移量越小，底板和左侧煤帮位移量越大；随巷旁支护体宽度的增大，左帮的垂直应力逐渐增大，右帮垂直应力先增大后减小，顶板垂直位移和两帮水平位移逐渐减小，底板垂直位移逐渐增大；随着巷内支护阻力的增大，两帮的垂直应力均先增大后减小，巷道变形量先减小后增大，巷道底板和右帮位移量随支护阻力的变化并不明显。