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为了解决阳煤二矿综放工作面二次采动巷道围岩变形严重问题,通过对二次采动煤巷支护困难以及原有支护方案存在的不足进行理论分析,提出了加长锚索与丛柱联合加强支护改进方案,并采用数值模拟软件模拟了加强支护条件下巷道围岩变形特征,通过工程实践,巷道顶板移近量减少了71.3%,断面收缩率由原支护方案80%减少到17%。结果表明,加长锚索与丛柱联合加强支护技术效果良好,在软岩巷道中能有效将锚杆支护形成的整体结构与深部围岩相连,维护巷道稳定性。
In order to solve the problem of serious deformation of surrounding rock of secondary mining roadway in fully mechanized top coal caving face of Yangmei No.2 Coal Mine, the paper analyzes the difficulties of secondary mining coal roadway support and the existing deficiencies of the original support scheme, And the pillars and columns to strengthen the support improvement program. The deformation characteristics of the surrounding rock of the roadway under the conditions of strengthening support were simulated by numerical simulation software. By engineering practice, the amount of approach of the roof of the roadway decreased by 71.3%, and the reduction of area from the original support scheme 80% to 17%. The results show that the combined effect of the extended anchor line and the plexiform column strengthens the support effect effectively and the overall structure formed by bolt support can be effectively connected with the deep surrounding rock in the soft rock tunnel to maintain the stability of the roadway.