远距离下解放层开采在深部矿井的实践

Practice of Long Distance Lower Release Seam Mining in Deep Mine

依据采场上覆岩层的垮落规律,分析了当解放层开采后上覆岩层的受力状态。结合断裂力学裂纹扩展理论,建立被解放层的断裂力学模型,并采用最大周向应力准则确定裂纹扩展的临界应力。工程实践表明,深井解放层开采后,被解放层透气性大幅提高,大量吸附态的瓦斯解吸,工作面回采时回风流瓦斯浓度维持在0.4%左右,满足了安全回采的要求。

Based on the law of overlying strata failure, analyzes the forced state of overlying strata after the lower release seam mined. Combined with fracture mechanics theory of crack growth, set up the fracture mechanical model of release seam, using the maximum circumferential stress criterion determines the critical stress of crack growth. The project practice showed that after the lower release seam mined, the permeability of release seam remarkably raised, gas in adsorption transition to desorption, hold the gas concentration of return air around 0.4% when the face mining, satisfy the demands of safe mining.