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根据国内某大型矿井的实际条件,采用数值模拟矿井开采条件,研究长壁工作面开采期间顺槽保护煤柱上锚杆的受力特征,研究结果显示:在工作面采动影响下巷道锚杆的锚固力变化较大,锚杆支护参数应和采动影响的剧烈程度相适应,防止锚杆预紧力过大或过小而造成矿压事故;锚杆支护力受其工作面采动影响较大,尤其是超前支撑压力的影响,在工作面采动前应对巷道进行加强支护;该矿工作面顺槽应提高顶板锚杆与锚索的预紧力以达到提高后期支护强度的目的;锚索由于具有长度大和承载力大的特点,其预紧力应大幅度提高。
According to the actual conditions of a large domestic mine, numerical simulation of the mining conditions of the mine to study the mechanical characteristics of the bolt on the coal pillar along the trough during the mining of longwall face, the results show that: under the influence of mining face bolt Of the anchoring force changes greatly, and the bolt support parameters should be adapted to the severity of the mining influence to prevent the preloading of the anchor bolt from being too large or too small, resulting in the mine pressure failure. The bolt support force is affected by the mining face The impact of moving larger, especially the impact of advanced support pressure, mining face should be strengthened before mining support; along the groove of the mine face should be increased roof bolt and anchor preload to achieve the latter part of support The purpose of strength; anchor cable as a result of large length and large capacity characteristics, the pre-tightening force should be greatly improved.