综采工作面上覆岩层运动特征试验研究

Experiment Study on Overburden Strata Movement Features of Fully Mechanized Coal Mining Face

采用钻孔深基点现场实测法对综采工作面上覆岩层运动特征进行试验研究,以中岭煤矿综采工作面为例进行数据实测。通过对实测结果进行位移分析和速度分析,得出试验研究矿井综采工作面采动后上覆岩层总体呈阶段性非均匀下沉的运动形式;内部岩层断裂落差不大,地表未出现明显的大落差断裂;上覆岩层的绝对位移量由地表至煤层顶板逐渐增大,地表初始位移产生在工作面前方,内部岩体初始位移出现在工作面后方,并且移动速度呈非均匀的阶段分布特征;上覆岩层在采动后产生了明显永久性离层,离层厚度总量与综采工作面平均采高相比约为采高的0.36倍。

A site measurement method with a borehole deep base point was applied to the experiment study on the overburden strata movement features of the fully mechanized coal mining face and to the data measurement of a fully mechanized coal mining face in a mine as an example. The displacement analysis and the speed analysis on the site measured results showed the overburden strata generally were in an inhomogeneous subsidence movement form. There was a small drop height between the internal strata failures and there was no large drop failure occurred on the surface ground. The absolute displacement of the overburden strata was steadily increased from the surface ground to the seam roof and the initial displacement of surface ground was occurred in the front of the coal mining face. The initial displacement in the internal rock strata was occurred in the rear part of the coal mining face and the moving speed was in an inhomogeneous stage distribution features. After the mining, permanent bed separations were occurred in the overburden strata and in comparison with the average mining height of the fully mechanized coal mining face, the total bed separation thickness was about 0. 36 times higher than the mining height.