大采深厚松散层开采地表沉陷特征

基于地表沉陷的观测数据,分析了极不充分开采移动和动态下沉特征,计算了极不充分工作面开采程度和下沉盆地的范围,详细描述了极不充分开采地表变形以及拐点位置。表明大采深厚松散层开采条件下,在上山方向下沉盆地的边缘即使下沉值很小,也会产生较大的水平移动;极不充分开采时地表下沉盆地十分平缓,且位置偏向上山方向;下沉盆地的拐点位于煤柱的上方而非采空区上方。对于指导相似地质条件下开采,解放建筑物下压煤具有较大的实用价值和指导意义。

Surface subsidence characteristics due to deep mining with thick and broken overburden

Base on the observation data of the surface ground subsidence,the paper analyzed the displacement and dynamic subsidence features under the ultra uncompleted mining.The paper calculated the ultra uncompleted face mining degree and the subsidence basin area.The paper in detail stated the surface ground deformation and the turning point location under the ultra uncompleted mining.Under the conditions of the mining in the seam with deep mining depth and thick overburden,the boundary of the subsidence basin even with a small subsidence value at the rise direction could have a large horizontal displacement.Under the condition of the ultra uncompleted mining,the surface ground subsidence basin would be gently flat and the location would be forward to the rise direction.The turning point of the subsidence basin would be located above the pillar not above the goaf.The above would have the actual value and guidance to the coal mining under the similar geological conditions and to coal mining under the building structures.