深部复杂破碎软岩巷道围岩变形控制技术研究

    Study on surrounding rock deformation control technology of deep complex broken soft rock roadway

    • 摘要: 针对金能煤矿1201回风巷道存在的深部高应力软岩难支护问题,通过现场调研、理论分析、数值模拟及现场工业性试验,系统地分析了巷道围岩变形破坏机理,并提出了有效的支护方案。首先研究分析了巷道围岩变形破坏的主要机理,指出地质条件差、围岩渗水、支护参数不合理是导致巷道变形失稳的主要因素。基于以上变形特征,提出了一种“锚杆(索)+金属管棚+注浆+钢筋网”联合支护方案。该方案通过长短锚索的有机结合,实现了深浅部围岩的有效支护,提高了围岩的整体稳定性。在理论分析方面,基于莫尔-库伦准则,对比了原始支护方案与优化支护方案的支护作用力和围岩强度变化,从理论上验证了优化支护方案的适用性。并数值模拟分析了优化支护方案在巷道顶板支护应力、两帮支护应力、支护水平位移、支护垂直位移等方面均显著优于矿井巷道原始支护方案,分别提高了约0.02 MPa、0.08 MPa、125 mm和137 mm。同时,为验证优化支护方案的实际效果,在现场进行工业性试验。试验结果表明,优化支护方案后巷道的顶底板和两帮围岩控制效果分别提高了约59.20%和62.42%,显著优于原始支护方案。综上所述,优化后的联合支护方案在深部复杂破碎软岩巷道围岩变形控制作用效果满足矿井需要,并为其他类似地质条件下的矿井巷道支护提供了重要参考。

       

      Abstract: Regarding the problem of difficult support for deep high-stress soft rock in the 1201 air-return roadway of Jinneng Coal Mine, through on-site investigation, theoretical analysis, numerical simulation and on-site industrial tests, the deformation and failure mechanism of the surrounding rock of the roadway is systematically analyzed, and an effective support scheme is proposed. Firstly, the main mechanisms of deformation and failure of the surrounding rock of the roadway are studied and analyzed, and it is pointed out that poor geological conditions, surrounding rock seepage, and unreasonable support parameters are the main factors causing deformation and instability of the roadway. Based on the above deformation characteristics, an “anchor bolt (cable) + steel pipe shed + grouting + steel wire mesh” combined support scheme is proposed. This scheme achieves effective support of deep and shallow surrounding rocks through the organic combination of long and short anchor bolts, improving the overall stability of the surrounding rock. In terms of theoretical analysis, based on the Mohr-Coulomb criterion, the supporting force and the strength changes of the surrounding rock of the original support scheme and the optimized support scheme are compared, and the applicability of the optimized support scheme is verified theoretically. Numerical simulations revealed superior performance of the optimized solution across key parameters: roof support stress increased by 0.02 MPa, two-side support stress by 0.08 MPa, with horizontal and vertical displacements reduced by 125 mm and 137 mm respectively. Field trials confirm a 59.20% improvement in roof-to-floor convergence control and 62.42% enhancement in two-side convergence management compared to conventional methods. The refined support system effectively addresses deformation control in deep fractured soft rock roadways while providing critical insights for similar geological conditions.

       

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