In response to the unreasonable support plan for the water-rich and fractured area of the mining excavation roadway,which has caused problems such as roof fall and fragmentation,the optimization of tunnel support parameters was studied based on the engineering background of the marble fractured area in the front of the 1 660 m level YM-Ⅱ roadway.In order to reasonably and effectively support the roadway and reduce support costs,a roadway model was established based on on-site practice.The support plan was designed through orthogonal experiments,and FLAC3D numerical simulation software was used to simulate and calculate.The stability of the surrounding rock in the roadway was compared and analyzed through simulation results.The analysis results indicate that the length of anchor rods mainly affects the deformation of the surrounding rock of the tunnel,and the spacing between anchor rods mainly affects the damage of the surrounding rock of the tunnel;The optimal support plan is for anchor rods with a diameter of 40 mm,a length of 1.8 m,and a spacing of 0.9 m between rows × 0.9 m can reduce the displacement of tunnel surrounding rock by 70.77％,plastic zone volume by 63.91％,and vertical stress by 12.96％,effectively controlling the stability of tunnel surrounding rock and providing assurance for mine safety production.The research results may provide reference for the support design and ground pressure control of surrounding rock tunnels in water-rich and fractured areas.
关键词
富水破碎围岩巷道/数值模拟/锚杆支护/参数优化
Key words
water-rich and fractured surrounding rock roadway/numerical simulation/anchor rod support/parameter optimization
维普
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