沿空掘巷顶板破断特征及不对称控制技术

Research on Roof Broken Characteristics and Asymmetric Control Technology in Gob-side Entry Driving

某矿605综放工作面留设10 m窄煤柱后,沿空掘巷过程中易出现冒顶、垮帮、支护体损毁等强矿压现象。以605回风平巷窄煤柱段为研究对象,采用现场调研、理论分析、数值模拟和井下试验等方法进行分析研究,得知基本顶断裂位置在煤柱内6.5 m处,基本顶中关键块B的回转下沉运动是巷道破坏的根本原因。结合现场地质条件,提出了非对称的"多锚索-槽钢-钢筋组合圈梁"支护方案,控制围岩非对称变形破坏,现场实施后巷道维护状态较稳定。

10m narrow coal pillar in a fully mechanized top coal caving mining face has been reserved in No. 605 roadway, the roadway becomes more prone to roof fall, side-rib collapsed and damage of support parts during the process of driving along the goaf. With narrow coal pillar section in No. 605 roadway as the research object, using the ield investigation, theoretical analysis, numerical simulation and field test method, the results show that the basic top ault located 6.5 m inside the coal pillar, and the root cause of roadway deformation comes from block B with subsided and rotated movement of is. Based on the site geological conditions, an asymmetric multi-anchor-channel-reinforced composite ring beam support program is introduced to control the asymmetric surrounding rock deformation, After the mplementation of the project, the roadway condition is relatively stable, and the workload for maintenance reduced.