动压影响下留窄煤柱沿空掘巷围岩控制技术
Surrounding Rock Control Technology of Narrow Coal Pillar Gob-side Entry Driving Under Dynamic Pressure
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摘要: 以湖西煤矿31104工作面运输巷掘进期间受相邻工作面动压影响为背景，利用理论分析和数值模拟相结合的方式确定窄煤柱的合理宽度为5 m，并提出以“高强预应力让压锚杆+预应力锚索”为核心强化护巷窄煤柱侧的支护方案。现场监测表明：动压影响下巷道围岩的最大变形量小于300 mm，锚杆的最大受力为165 kN，围岩最大应力均维持在5 MPa左右，没有出现应力集中现象，有效地控制了动压巷道的底鼓和非对称变形，保证了煤矿高产高效地安全生产。Abstract: Taking the impact of the dynamic pressure of the adjacent working face during the tunneling of 31104 working face in Huxi Coal Mine as studying background, the reasonable width of narrow pillar is 5 m by means of theoretical analysis and numerical simulation, and we propose the support scheme of strengthening the narrow pillar side of the roadway by taking the “high-strength pre-stressing yield anchor + pre-stressed anchor cable” as the core. Site monitoring shows that under the influence of dynamic pressure, the maximum deformation of roadway surrounding rock is less than 300 mm, the maximum force of bolt is 165 kN, and the maximum stress of surrounding rock is about 5 MPa, there is no stress concentration phenomenon, which effectively controls the dynamic pressure roadway under the heaving floor and asymmetric deformation and ensures high production and efficient production of coal mine.
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