深井马头门软岩硐室复合支护技术研究

Research on the Composite Supporting Technology for the Ingate Chamber with Soft Rock in Deep Mine

某矿副井马头门处于深井高应力、大断面、极破碎岩层等复杂条件下围岩破坏比较严重。通过分析马头门围岩破坏原因之后,提出了锚网索喷+反底拱钢筋混凝土砌暄的联合支护方案。利用FLAC^(3D)对原支护方案和优化方案模拟并对比分析之后,决定采用锚-网-喷-索初次支护、双层钢筋砼二次支护方案修复副井马头门破坏段部分。现场监测表明:加固支护后,拱顶下沉量为16 mm,底鼓量为10mm,两帮移近量为12mm,硐室变形得到有效控制。

The ingate of an auxiliary shaft in a mine was located in the complicated conditions, such as high stress, large section and extremely broken rock, leading to the serious destruction causes of surrounding rocks. Through the analysis on the destruc- tion of surrounding rocks in ingate, a support method combining the bolt-wire-cable-shotcrete and the inverted-arch rebar-con- crete-masonry was proposed. The original supporting methods and the optimization designs were simulated by FLAC3D, and then compared and analyzed. The supporting scheme was selected to repair the destruction section of ingate, including the initial support of bolt-wire-cable-shotcrete and the second support of double rebar-concrete. The field monitoring showed that after supporting, the settlement in the top of arch was 16 mm, the floor heave was 10mm, the displacement in two sides was 12 mm, and the deformation of chamber was controlled effectively.