深部煤巷底臌控制机制及应用研究

 以徐州矿区发生非线性大变形破坏现象的深部煤巷围岩结构体为研究对象，从围岩3个部位相互作用的角度提出有效控制底臌的新方法。通过对围岩物理力学性能的测试、理论分析、数值模拟、现场试验的研究，得出采用锚网索耦合支护技术控制底臌的力学作用机制：利用关键部位施加锚索，减小顶板松动岩体通过两帮传递到底板上的压力，有效减小底臌量；利用锚网注浆增加两帮岩体强度及减小收缩量，限制两帮对底板两侧形成的固定约束向深处转移，以减小发生底臌的底板宽度；对底角施加刚性锚杆及注浆，分解来自两帮的挤压应力，提高底角抵抗剪切滑移破坏的强度，控制底臌。在该原理下提出控制设计，运用到夹河煤矿－850 m水平煤巷，监测结果表明：基于技术原理下的支护设计可以有效控制深部煤巷大变形和底臌的发生。

RESEARCH ON MECHANISM AND APPLICATION TO FLOOR HEAVE CONTROL OF DEEP GATEWAY

The rock mass structure of surrounding rocks with non linear large-scale deformation in deep entry of coal mines is studied. A new method is proposed to control floor heave considering the effect of the roof，side and corner on the floor in design. Based on the micro-fabric test，theoretic analysis，numerical simulation and in-situ test，mechanism of controlling floor heave with bolt-net-anchor coupling support technology is discussed. With the anchor wire at key location mobilizing the strength of deep rock，the compression force passing from top of the breaking rocks over the wall is lessened；with the intensity strengthened and deformation reduced，the length constrained by side for the floor heave is shortened；with the rigid bolt and corner grouting，the pressure from side decreased and the shear resistance at corner is improved. Therefore，floor heave is controlled effectively. The theory is applied to control the stability of deep coal roadway in Jiahe coal mine and in-situ measurement shows that the large-scale deformation and floor heave are successfully controlled.