No. 8 Mine, Pingdingshan Coal Mine Group Co. Ltd.
School of Safety Science and Engineering, Henan Polytechnic University
Huaibei Pingyuan Soft Rock Support Engineering Technology Co. , Ltd.

针对平煤八矿深部软岩巷道变形大、支护失效严重等技术难题,采用现场调研、理论分析、数值模拟以及工业试验等方法,分析了高应力软岩巷道变形特征和失稳破坏机制,提出巷道围岩协同一体化控制机理,设计了“深浅部锚固注浆+深部锚索补强+卸压槽卸压”的围岩协同一体化控制方案。通过理论计算验证得到支护后协同围岩承载体极限承载合力大于其承载合力;通过FLAC3D模拟显示设计方案能够使内外围岩结构相互协同承载,充分释放巷道周围塑性变形能,均匀分布围岩载荷。巷道重新支护后,围岩应力影响范围转移至巷道深处10m区域,围岩-支护达到协同一体载荷均匀的承载结构;矿井监测数据表明:巷道修复一年后,最大移近量不足巷道宽的4%,最大下沉量不足巷道高度的5%,巷道变形基本趋于平稳状态。

Aiming at the technical problems such as large deformation and serious support failure of deep soft rock roadway in Pingmei No. 8 Mine, the deformation characteristics and instability failure mechanism of high stress soft rock roadway were analyzed by means of field investigation, theoretical analysis, numerical simulation and industrial test. The synergistic integrated control mechanism of roadway surrounding rock was put forward, and the synergistic integrated control scheme of ‘deep and shallow anchoring grouting+deep anchor cable reinforcement+pressure relief groove pressure relief’ was designed. According to the theoretical calculation, the ultimate bearing capacity of the synergistic surrounding rock bearing body after support is greater than its bearing load; FLAC3D simulation shows that the design scheme can make the internal and external surrounding rock structure cooperate with each other, fully release the plastic deformation energy around the roadway, and evenly distribute the surrounding rock load. After the roadway is re-supported, the influence range of surrounding rock stress is transferred to the m deep area of the roadway, and the surrounding rock-support achieves a bearing structure with uniform load. The monitoring data of the mine show that after one year of roadway repair, the maximum displacement is less than 4% of the width of the roadway, the maximum subsidence is less than 5% of the height of the roadway, and the deformation of the roadway tends to be stable.

国家自然科学基金联合基金重点项目(U23A20600)

王稳飞,高保彬,张龙洋,等.高应力软岩巷道围岩协同一体化控制机理及技术研究[J].煤炭工程,2024,56(11):103-109.