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由于沿空留巷服务时间较长,巷道围岩变形较大,合理地计算巷旁充填体宽度至关重要。根据沿空留巷上覆岩层的活动规律,建立了关键块和直接顶的力学模型,分析了关键块与沿空留巷围岩相互作用机制,推导出巷旁支护阻力的计算公式,并引入了关键块稳定性系数K1、K2及其稳定性影响因素的敏感度。研究结果表明,当K1>1时,关键块发生挤压变形失稳;当K2>1时,关键块发生滑落失稳。以淮南谢一矿512(5)工作面为工程背景,确定了合理的巷旁充填体宽度,计算出关键块稳定性系数,获得了各影响因素对关键块稳定性的敏感度。实例分析表明,采高对关键块的稳定性影响较大,在大采高工作面中进行沿空留巷较为困难。
Because of the service time of gob-side entry retaining, the surrounding rock deformation of the gutter is large, so it is very important to calculate the width of gutter properly. According to the law of activity of overlying strata in gob-side entry retaining, the mechanical model of key block and direct top is established, the interaction mechanism between key block and surrounding rock of gob-side entry retaining is analyzed, and the calculation formula of roadside support is derived. The key block stability coefficient K1, K2 and its stability of the sensitivity of the factors. The results show that when K1> 1, the key block is buckled and destabilized. When K2> 1, the key block slips out of shape. Taking the 512 (5) face of Huai’nan Xie a coal mine as the engineering background, the width of the roadside filling body is determined and the coefficient of stability of the key block is calculated. The sensitivity of each influencing factor to the stability of the key block is obtained. The case study shows that mining height has a great influence on the stability of the key blocks, and it is more difficult to carry out gob-side entry in large mining face.