高级检索

基于层次分析法的软岩巷道支护方案优化及应用研究

Optimization and application research of soft rock roadway support scheme based on AHP

  • 摘要: 针对土城煤矿运煤上山围岩软弱变形及控制困难的问题,通过现场调研、理论分析、数值模拟等研究手段,揭示软岩巷道的变形破坏特征及破坏原因,认为围岩强度低、自承载能力差、支护设计不合理、复杂应力环境及水力侵蚀作用是巷道失稳变形的主要原因。基于此,运用层次分析法建立评价指标体系,提出2种工程类比支护方案,采用FLAC3D模拟2种支护方案的支护效果,最终得出"锚杆索网+灌浆+U型钢"支护方案能够满足顶板及两帮对移近量的要求。后期现场监测结果表明:新优化方案对巷道围岩整体变形的控制满足预期,45 d后收敛稳定,收敛速率小于0.5 mm/d,整体移近量低于70 mm,满足巷道支护要求,支护效果良好。

     

    Abstract: Aiming at the challenge of weak and large deformation of surrounding rock and difficulty in control of coal transportation in Tucheng mine,the theoretical analysis,laboratory test and numerical simulation were used to reveal the deformation and failure characteristics of soft rock roadway and the cause of damage.Poor self-supporting capacity,unreasonable support design,complex stress environment and water erosion obviously were the main reasons for the instability of the roadway.Based on these,the analytic hierarchy process was applied to establish the evaluation index system,and proposed two engineering analog support schemes.FLAC3D were used to simulate the support effect of the two support schemes,and the "anchor(cable)+grouting+U steel" support schemes were chose.The solution can meet the requirements of the roof and two side of approaching quantities.The results of post-site monitoring showed that the overall deformation control of the surrounding rock under the new optimization scheme met the expectations.After 45 days,the convergence was shown stable and the convergence rate was less than 0.5 mm/d.The overall displacement was less than 70 mm,which fits the requirements of roadway support and has adequate support effect.

     

/

返回文章
返回