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实践证明,在软岩巷道中,采用二次支护技术控制围岩变形是可行的,除了保证施工质量外,二次支护最关键的技术是掌握二次支护的最佳支护时间,也即一次支护后最佳卸压时间。以某矿中央泵房为工程背景,采用数值模拟分析不同支护时机对巷道支护效果的影响,并通过现场跟踪观察和实测,确定该巷道二次支护实施的最佳时间,以确保巷道支护效果。
Practice has proved that in soft rock tunnels, the use of secondary support technology to control the deformation of surrounding rock is feasible, in addition to ensuring the quality of construction, the second support the most crucial technology is to master the best support time secondary support, That is, the best pressure relief time after a support. Based on the engineering background of a central pump house in a mine, numerical simulation was conducted to analyze the influence of different support timing on the roadway support effect. The best time for the secondary support of the roadway was determined through on-site follow-up observation and measurement to ensure that the roadway Support effect.