摘要
为解决深埋大断面煤巷掘进效率低、支护效果不佳的问题,以大海则20101回风巷为工程背景,通过现场调研、理论分析、数值模拟方法分析了机锚不协调、顶板基础锚固层薄弱支护效能低是掘支失衡的根本原因;形成了以掘支协同技术为基础,通过加大顶板锚固层厚度提高单根锚杆的支护效能以降低支护密度的控制对策;基于此,提出了新型掘支协同方案,并分析验证了新支护方案的可行性。工程实践表明:采用掘支协同新型支护方案后,顶板下沉量控制在40 mm内,帮部变形量控制在60 mm内,柔性锚杆预紧力可稳定达到200 kN以上,巷道围岩控制效果得到明显改善;同时支护密度降低约35.7%,月进尺突破400 m,在保障支护控制效果的同时,提高了掘支效能,实现了掘支协同。
In order to solve the problems of low tunneling efficiency and poor support effect of deep buried large section coal roadway, taking Dahaize 20101 return air roadway as the engineering background, through field investigation, theoretical analysis and numerical simulation, this paper analyzes that the root cause of excavation and support imbalance is the disharmony of machine anchor, the weak anchorage layer of roof foundation and the low support efficiency. Based on the excavation and support cooperation technology, the control countermeasures of increasing the thickness of roof anchorage layer, improving the support efficiency of single bolt and reducing the support density are formed. Based on this, a new excavation and support cooperation scheme is proposed, and the feasibility of the new support scheme is analyzed and verified. The engineering practice shows that after adopting the new support scheme of excavation and support cooperation, the roof subsidence is controlled within 40 mm, the deformation of the side is controlled within 60 mm, the preload of the flexible bolt can stably reach more than 200 kN, and the control effect of roadway surrounding rock has been significantly improved. At the same time, the support density is reduced by about 35.7% and the monthly footage exceeds 400 m. While ensuring the support control effect, the excavation and support efficiency is improved and the excavation and support coordination is realized.
作者
杨国强
YANG Guoqiang(Dahaize Coal Mine,China Coal Shaanxi Yulin Energy and Chemical Company Limited,Yulin 719000,China)
出处
《煤矿安全》
CAS
北大核心
2022年第11期89-97,共9页
Safety in Coal Mines
关键词
掘支协同
支护参数优化
大断面巷道
厚层锚固
巷道支护
cooperation of excavation and support
optimization of support parameters
large section roadway
thick layer anchorage
supporting design
