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随着开采强度的加大,平煤股份所属的主力矿井多数已进入800m以上的深部开采,巷道处于高应力环境中,中等强度锚网支护的回采巷道变形量大,稳定所需时间长,返修率高。结合平煤股份十一矿丁5-6-26071风巷的工程地质条件,采用数值模拟技术研究了高强锚杆锚索协调支护巷道在不同动压作用下的矿压显现特征:掘巷阶段,支护方式完全能够满足要求;在受到超前支承压力的初期阶段,仍然能够满足需要;但在超前支承压力的峰值阶段,锚杆锚索滑脱,底臌严重,两帮内挤,需要采取加强支护措施。工业性试验表明:掘巷阶段巷道表面位移、深部位移及支护受力均在合理的范围之内,巷道断面收缩率为最大为12.4%,满足使用要求。
With the increase of mining intensity, most of the main mines owned by Pingdingshan Coal Mining Co., Ltd. have entered the deep mining of more than 800m. The roadway is under high stress environment. The deformation of the mining roadway supported by medium-strength anchor net is large and the time required for stability is long, Rework rate is high. Combined with the engineering geological conditions of No. 5-6-26071 wind tunnel in Pingdingshan Coal Mining Company, numerical simulation technology was used to study the characteristics of rock pressure under the different dynamic pressure in the roadway with high strength anchor and anchor cable coordinated support: , The support method can fully meet the requirements; in the early stages of the pressure ahead of the support can still meet the needs; but in the peak support phase of the early stages of stress, anchor cable slippage, solemn serious, squeeze the two groups need to be strengthened Support measures. Industrial tests show that: the roadway surface displacement, deep displacement and support force are within a reasonable range, roadway section contraction rate of up to 12.4%, to meet the requirements.