浅埋煤层采动覆岩运动相似材料模拟研究

为分析伊犁一矿首采工作面浅埋煤层采动覆岩运动特征,进行了相似材料模拟研究。分析了直接顶破坏、老顶破坏、采动覆岩破坏高度发展等规律,并进行了切顶冒落分析。研究结果表明,首采工作面具有采动覆岩破裂高度随工作面推进而增大,采动覆岩破裂高度在充分采动前约为采空区跨度之半等规律。试验过程和理论计算均未出现切顶冒落现象。研究结果可为矿区首采工作面煤层安全开采提供理论依据,同时,对分析其他浅埋煤层安全开采覆岩运动规律具有一定的借鉴意义。

Study on Similar Material Simulation of Mining Overburden Strata Movement in Shallow Coal Seam

The simulation study of the similar materials was carried out in order to analyze the movement characteristics of the mining overburden strata in shallow coal seam. Analysis was made for the the breaking law of the main and immediate roof, the development law of the mining overburden strata failure height, the roof-cut caving and so on. The results showed that the failure height of the mining overburden strata in the first-mining face increased with the face advance and the breaking height of the mining overburden strata before full mining was about half of the gob span. No roof-cut caving occurred in the test and theoretical calculation. The test results can provide theoretical basis for the safe extraction of the first-mining face and also has reference significance for analyzing the overburden strata movement law of other shallow coal seams.