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针对淮北海孜矿新副井马头门处于岩层极为破碎、千米埋深、断面尺寸大等复杂条件,利用ABAQUS有限元数值软件进行了原支护设计方案情况下的马头门围岩稳定性分析,研究了马头门围岩位移场、应力场和塑性区的分布规律及支护结构的受力特征,据此对马头门的支护结构进行了设计优化。马头门初期支护采用锚、网、喷、索的支护形式;二次支护采用带反底拱的全断面钢纤维钢筋混凝土衬砌,增设底板注浆锚杆和底板锚索,并通过室内配合比试验确定了钢纤维混凝土的强度等级、钢纤维掺入率和最优配合比。现场监测结果表明,优化后的马头门支护结构安全储备较高且设计方案合理。
In order to solve the complex conditions such as the extremely broken rock formation, the depth of one kilometer and the large size of the cross section of the new auxiliary shaft of Haizi Mine in Huaibei, the stability of the surrounding rock of Matou Gate was improved by the ABAQUS finite element software Based on the analysis, the displacement field, the distribution of stress field and plastic zone and the mechanical characteristics of the supporting structure of the surrounding rock of Matoumen were studied, and the support structure of Matoumen was optimized. The first support of the horse head door adopts the support form of anchor, net, spray and cable; the second support adopts the full-section steel fiber reinforced concrete lining with a back-arch, and adds the grouting anchor rod and the anchor plate of the floor through the back support and passes The indoor mix test confirmed the strength grade of steel fiber reinforced concrete, the incorporation rate of steel fiber and the optimal mix proportion. The on-site monitoring results show that the optimized safety reserve of Matoumen retaining structure is high and the design scheme is reasonable.