大断面二次动压巷道变形特征与支护对策

Deformation Characteristics and Supporting Measures of Secondary Dynamic Pressure Roadway with Large Section

为解决大断面二次动压巷道变形严重的难题,以察哈素煤矿3103辅运巷为工程背景,着重深入分析3103工作面回采对3103辅运巷造成的变形特征,并在矿压观测数据基础上提出了针对性的"锚杆+锚索+钢带+金属网"的联合支护方案。数值模拟和现场试验结果证明:该方案可有效控制大断面二次动压巷道变形在可控范围之内;经治理后,3103辅运巷顶板下沉高度23.5 mm,深部呈拱形离层,离层范围在15~20 mm;平衡时,3103辅运巷两帮变形最大75 mm,在可控范围之内。

In order to solve the problem of serious deformation of roadway with large section secondary dynamic pressure, this paper takes 3103 auxiliary transportation lane of Chahasu Coal Mine as the engineering background, analyzes the deformation characteristics of 3103 auxiliary transport roadway caused by the mining in 3103 working face, and proposes the combined support scheme of ＂bolt ＋ anchor ＋ steel ＋ metal net＂based on observation data. Numerical simulation and industrial experiments show that this scheme can effectively control the deformation of large section secondary dynamic pressure roadway within controllable range; after the treatment, the subsidence height of the roof of the auxiliary roadway is 23.5 mm, and the deep part is arched and dissociated, and the dissociation range is 15 mm to 20 mm; at equilibrium, the maximum deformation of both sides of 3103 auxiliary roadway is 75 mm, within the controllable range.