火成岩下开采矿压显现规律的相似模拟研究

Similar Simulation Research of Mining Pressure Law under the Igneous Rock Situation

以芦岭矿Ⅱ884-1工作面为依据,模拟了不同火成岩条件下的老顶(火成岩)破断和应力变化规律。在老顶厚度相同的条件下,当火成岩侵入面积大时,其顶底板压力盒应变的峰值就较大,当侵入面积相同时,其顶底板压力峰值则基本相同。在老顶厚度不同的条件下,当火成岩厚度加大时,其初次破断和周期破断的距离也相应增大。当火成岩侵入面积相同而厚度不同时,火成岩厚度大的应变峰值较大。研究结论不仅为该面的控顶设计及顶板处理提供了依据,也为火成岩侵入条件下的顶板运动和破断提供了技术参考。

Based on the face of 11884-1 in Luling mine,the main roof breaking and stress variation under the conditions of different igneous rock was simulated and the results achieved are as follows ： Under the condition of the same thick main roof, the more area the igneous intrusive ,the more the peak strain of the pressure cells which is at the roof and floor is. When the igneous intrusion area is equal, the peak strain of the pressure cells is almost same. When the thickness of ig- neous rocks was increased, the distance of first breaking and cycle breaking increase accordingly. When the igneous intrusion area is the same and the thickness is not ,the more the igneous rock thickness is, the higher the peak strain is. The research results not only provide a basis for roof control design and roof processing in the face, but also a technical reference for the movement and breaking of the roof under the conditions of igneous intrusion.