摘要
为提高急倾斜煤层长壁放顶煤工作面围岩控制效果和支架稳定性,本文采用物理模拟和理论分析相结合的方法,对顶板结构和液压支架的稳定性进行了研究。结果表明:尾闸附近顶板下沉幅度大,切高小,主闸附近顶板下沉幅度相对较小;随着开采空间的增大,主闸门上方顶板岩层的冒落角增大。顶板岩层的垂直位移和水平位移特征表明,垮落块体在顶板结构的下铰点附近旋转,可能导致滑动失稳。煤层倾角大,使顶板结构更容易发生滑动失稳。在急倾斜煤层中,尾闸和主闸上方可以很容易地形成一个三铰拱。倾角的增长,沉降大门上方的拱脚形成显著减少,从而降低屋顶结构的概率变得不稳定由于大变形,而潜在的尾门上方的屋顶结构的滑动稳定性大大增加。
In order to improve the surrounding rock control effect and support stability of steep coal seam longwall top caving face,the stability of roof structure and hydraulic support was studied by combining physical simulation and theoretical analysis.The results show that the roof subsidence near the tail gate is large and the cutting height is small,while the roof subsidence near the main gate is relatively small.With the increase of mining space,the caving Angle of roof strata above the main gate increases.The characteristics of vertical displacement and horizontal displacement of roof strata indicate that the caving block rotates near the lower hinge point of roof structure,which may lead to sliding instability.The large dip Angle of coal seam makes the roof structure more prone to sliding instability.In steep coal seams,a three-hinged arch can easily be formed above the tailgate and main gate.The increase of dip Angle significantly reduces the formation of the arch foot above the settling gate,thus reducing the probability of the roof structure becoming unstable due to large deformation,while the sliding stability of the roof structure above the potential tailgate is greatly increased.
作者
王晓波
WANG Xiaobo(Shanxi Shuozhou Jinneng Holding Group Shuozhou Coal Power Co.,LTD.,Shuozhou 038300,China)
出处
《煤矿现代化》
2023年第6期9-12,共4页
Coal Mine Modernization
关键词
急倾斜煤层
顶板结构
液压支架
稳定性
steep coal seam
roof structure
hydraulic support
stability
