巨厚砂泥岩下开采对上覆公路安全性影响分析

Analysis of influence of mining under thick sandstone and mudstone on safety of overlying highways

为研究巨厚砂泥岩下深部开采对斜交—平行工作面公路安全性的影响,以鄂尔多斯红庆河煤矿为例,分析上覆公路在工作面煤层开采后受到地表沉降影响的延续时间、水平变形、倾斜变形、曲率变化及开采过程中公路沉降等情况。结果表明,当公路平行于采空区走向边缘外时,公路受地表沉陷影响较小,水平变形以拉伸变形为主,横向倾斜变形值变化幅度不大,曲率的下沉曲线以下凹为主;当公路斜交穿过采空区上方地表时,公路受地表沉陷影响较大,纵向水平变形以压缩变形为主,横向水平变形则以拉伸变形为主,纵向倾斜变形量先沿工作面开采方向减小,再沿反方向逐渐增大,位于采空区正上方地表的公路下沉曲线以下凹为主,而在采空区边缘外的公路下沉曲线则以上凸为主。

In order to study the influence of deep mining under the mega-thick sand mudstone on the security of the highway of the oblique-parallel working surfaces,Hongqinghe Coal Mine in Ordos was taken as an example,the continuation time,horizontal deformation,inclined deformation,curvature change,and highway settlement during the mining process of the overlying highway affected by surface subsidence after coal seam mining in the working face were analyzed.The results show that when the highway is parallel to the edge of the goaf,the highway is less affected by surface subsidence,the horizontal deformation is mainly tensile deformation,the lateral inclination deformation value doesnot change much,and the curvature of the sinking curve is mainly depressed;when the highway crosses obliquity above the goaf,the highway is more affected by surface subsidence,the longitudinal horizontal deformation is mainly compression deformation,the lateral horizontal deformation is mainly tensile deformation.The longitudinal inclined deformation first decreases along the direction of working surface advancement,and then gradually increases along the opposite direction,the highway sinking curve located directly above the goaf is mainly concave,while the road sinking curve outside the edge of the goaf is mainly convex.