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软岩巷道锚索多段扩孔树脂锚固增强技术研究

Research on Multi-segment Reaming Resin Anchoring Enhancement Technology for Cable Bolts in Soft Rock Roadways

  • 摘要: 为解决软岩巷道锚索扩孔锚固中树脂锚固剂搅拌不充分、扩孔区域充填不密实、锚索偏心及孔壁损伤等问题,提出一种基于多段扩孔锚固MRAE的树脂锚固增强技术。通过理论分析揭示了MRAE的“分级破碎-梯度搅拌”“导升-封堵”协同控流及“居中限位-径向支撑”作用机理,阐明其对树脂锚固剂搅拌效果、锚固体强度、抗拔力及锚索居中性能的提升机制;采用数值模拟对比分析了MRAE与普通锚索对树脂锚固剂的搅拌流场特征,验证了MRAE对树脂运移速度和扩散范围的增强作用;通过实验室试验研究了MRAE对锚索钻进推力、扭矩及拉拔力的影响,结果表明增强锚固组拉拔力峰值平均值(36.5kN)是普通锚固组(14.9kN)的2.5倍,且居中度显著提高;现场试验进一步验证了该技术的有效性,软岩巷道中增强锚固锚索的拉拔力和预紧力均达到设计值,顶板离层位移量较普通锚固减少1.52倍,在不扩孔工况下其锚固力也满足工程要求。研究成果为软岩巷道锚索锚固质量提升提供了理论依据和技术支撑。

     

    Abstract: To address the issues in resin anchoring for cable bolts with reaming in soft rock roadways, such as insufficient stirring of resin anchoring agent, inadequate filling in reamed areas, eccentricity of cable bolts, and damage to hole walls, a resin anchoring enhancement technology based on the Multi-segment Reaming Anchoring Enhancement (MRAE) component is proposed. Through theoretical analysis, the mechanisms of MRAE are revealed, including the "graded crushing-gradient stirring", the synergistic flow control of "ascending guidance-sealing", and the "centralized limiting-radial support". These mechanisms clarify how MRAE improves the stirring effect of resin anchoring agent, the strength of the anchor solid, the pull-out resistance, and the centering performance of the cable bolt. Numerical simulations are used to compare and analyze the characteristics of the stirring flow field of resin anchoring agent between MRAE and ordinary cable bolts, verifying that MRAE enhances the migration speed and diffusion range of resin. Laboratory tests are conducted to study the influence of MRAE on the drilling thrust, torque, and pull-out force of cable bolts. The results show that the average peak pull-out force of the enhanced anchoring group (36.5 kN) is 2.5 times that of the ordinary anchoring group (14.9 kN), and the centering degree is significantly improved. Field tests further verify the effectiveness of this technology. In soft rock roadways, both the pull-out force and pre-tightening force of the enhanced anchoring cable bolts meet the design values. The roof separation displacement is reduced by 1.52 times compared with ordinary anchoring. Even under non-reaming conditions, its anchoring force still meets engineering requirements. The research results provide a theoretical basis and technical support for improving the anchoring quality of cable bolts in soft rock roadways.

     

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