深部煤巷复合顶板冲击失稳机制及联控原理
Compound Roof Rockburst and Instability Mechanism and Joint Control Principle in Deep Coal Roadway
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摘要: 针对深部高静载及厚硬覆岩破断强动载作用下煤巷复合顶板冲击失稳问题，通过理论分析表明：复合顶板冲击失稳启动条件是岩梁承载、形变及储能能力大幅超限。顶板冲击失稳过程与“一横五纵”模式协同扩展的6条宏观主控裂隙密切相关，致使顶板进入“层间离层-岩梁开裂-动力震裂”的恶性循环甚至瞬间崩落。通过提前使用“顶部高强桁架锚索-顶角斜锚杆-跨中长锚索”进行结构性联控补强，可以抑制顶板冲击失稳。Abstract: In view of rock burst and instability problems of compound roof in deep coal roadway under the action of high static loading and thick hard strata fracture dynamic load, the theoretical analysis shows that the starting condition of rock burst and instability of compound roof is the sharply overrun of rock beam bearing, deformation and energy storage capability. The studies show that the rock burst and instability process of roof was closely related to six main macroscopic control fissures cooperatively extended from "one transverse fissure and five longitudinal fissures" mode, which turns roof into the vicious circle of "interlayer separation - rock beam cracking - power shattering" or even instant caving. Structural joint control and reinforement can inhibit the rock burst and instability of roof by the advanced use of "high strength truss and anchor rope at the top of roof - inclined rock bolt at vertex angle- long anchor cable acrossing central roadway".
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Keywords:
- deep coal roadway /
- compound roof /
- rock burst /
- main control fissure /
- separation layer
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