特厚煤层综放工作面采动应力演化规律研究

Study on Mining Stress Evolution Law of Fully Mechanized Top Coal Caving Face in Ultra-thick Seam

为了研究特厚煤层综放开采的矿压显现规律,采用数值模拟方法对工作面开采过程进行模拟。结果表明:工作面推进至见方位置,超前支承压力升高;当工作面推进距离大于500m后,工作面后方120~260m范围应力集中明显,应力最大达到25~26MPa。顶板弹性势能释放引起的冲击、岩层运动形成的垂直方向的压力及侧向的挤压力影响控制着沿空巷道的矿压显现,开采过程中应对重点区域进行防护。

In order to study the rule of mine pressure in fully mechanized top coal caving mining, the numerical simulation method is used to simulate the mining process. The results show that the working face is advanced to the square position and the advance support pressure is increased. When the working face is pushed forward more than 500 m, the stress concentration in the range of 120-260 m behind the working face is obvious, and the maximum stress reaches 25~26 MPa. The impact caused by the release of roof elastic potential energy, the pressure in the vertical direction formed by the rock movement and the lateral squeezing pressure control the occurrence of underground pressure in gob-side entry roadway. The key areas should be protected in the mining process.