【摘要】 为了解决塔山煤矿综放工作面跨度10 m切眼的支护难题,采用理论分析、数值计算方法确定了大跨度切眼的支护形式为高强度锚杆、组合锚索、W钢带、金属网、混凝土联合支护,以形成群锚封闭效应,维护切眼巷道围岩的稳定性和安全性。试验中锚索锚固力达140~160 kN,锚固区内顶板最大离层值7 mm,顶底板移近量最大值38 mm,试验结果表明,设计提出的锚杆-组合锚索-混凝土支护提高了支护结构的整体承载力,有效控制了切眼巷道围岩的变形,保证了大断面切眼的安全使用。更多还原

【Abstract】 In order to solve the support difficulty of the open-off cut with a span of 10 m for the fully mechanized top coal caving mining face in Tashan Mine,the theoretical analysis and the numerical calculation method was applied to set up the high strength bolt,the built-up anchor,the W steel band,the steel mesh and the concrete combined support as the large span open-off cut support mode in order to form a group bolt closed effect and to keep the surrounding rock stability of the open-off cut and the safety.During the test,the anchorage force of the anchor reached at 140~160 kN,the max separation value of the roof in the anchorage zone was 7 mm and the max convergence value between the roof and floor was 38 mm.The test results showed that the bolt-built-up anchor-concrete combined support proposed in the design could improve the integrated bearing force of the support structure,could effectively control the surrounding rock deformation of the open-off cut and could ensure the safety application of the large cross section open-off cut.更多还原