School of Resources and Safety Engineering, China University of Mining and Technology (Beiing)

为得到厚松散层内部微变形规律,对姚桥煤矿7267工作面采动条件下厚松散层内部变形情况进行探测,分析该工程现象发生的机理。结果表明:厚松散层地层水平方向最大位移为3.65 mm,分层间存在振荡错动;垂直方向上整体表现为压缩状态,最大压缩量为18.67 mm,其中下部含水层疏水压缩,隔水层过水膨胀,整体变形对地表下沉影响较小。应力重新分布和介质随机排列造成层间错动,含水层压缩主要是采动后地层疏水,有效应力增加所致,隔水层膨胀主要是黏土层过水发生水化膨胀的结果。

In order to obtain tiny deformation law in thickness alluvium, this paper analyzed the deformation in thickness alluvium under the condition of mining in N 0.7267 coal mining face of Yaoqiao Coal Mine, and analyzed the mechanism for the engineering phenomenon. The results showed that the deformation in thickness all uvium had random varying characteristic and topped out at 3. 65 mm in the horizontal direction; the deformation in thickness alluvium was in a compressed state as a W hole and topped out at 18. 67 mm in the vertical direction, the bottom aquifer hydrophobic compression and aquiclude water- swelling, less affected on the ground depr ession. The stress redistribution and random medium rearrangement caused horizontal movement of layers. The compression of aquifer was mainly caused by hydroph obicity in strata, which made the effective stress increased, and the expansion of aquiclude was mainly caused by hydrating swelling of clay layers.

国家重点基础研究发展计划(973计划)资助项目(2013CB227903)；