综放开采下厚表土层移动规律研究

Research on Thick Overburden Movement Law under Full Mechanized Caving

为研究厚表土层在综放开采条件下的移动规律,在长治矿区高河矿W1303工作面建立了地表岩移测站。通过对实测数据的分析得出了最大下沉点位于采空区上部Z29,Z30,Z32测点,并得出了一系列上覆岩层的移动角参数。通过理论分析,得出在综放开采条件下上覆岩层的移动变形表现形式分为前期和后期两种。同时得出影响上覆岩层移动的主要因素有上覆岩层岩性、关键层的位置及作用、开采尺寸、工作面推进速度及顶板管理情况等。并结合FLAC3D数值模拟软件分别模拟了表土层厚度为140、190、240 m在回采过程中的地表移动规律,得出了表土层厚度为190 m与实际地表层厚度为189.43 m的移动规律相符。因此针对厚表土层在综放开采条件下的岩层移动规律的研究可为长治矿区矿井建设提供一定的参考价值。

Abstraet In order to investigate the movement law of thick overburden under full mechanized caving, rock movement monitoring station is built at W1303 face surface of Gaohe mine in Changzhi minging area. The analysis of the measured data showed that maximum subsidence point was located in the upper goaf Z29, Z30 ,Z32, and a series of strata movement parame- ters were obtained. The theoretical analysis indicated that the overburden movement deformation was divided into early and late two kinds under full mechanized caving. At the same time, the main factors for influencing the overlying strata movement were concluded as follows ： overburden lithology, the location and action of the key stratum, mining size, advancing speed of working face and roof management and so on. The numerical simulation software FLAC3D was adopted to simulate the surface movement law in the mining process with the topsoil thickness of 140 m, 190 m,240 m respectively. The conclusion was that the move- ment law of overburden thickness at 190 m conforms to that of actual surface layer at 189.43 m. Therefore ,the research on the rock movement law of thick overburden under full mechanized caving mining in Changzhi mine provides a certain reference for construction of the mine. Keywords Full mechanized top coal caving,Thick overburden, Strata movement, Numerical simulation