玲珑金矿松散围岩主巷变形破坏机制及支护对策

Study on deformation and damage mechanism of transport roadway in loose rock mass and supporting techniques

为解决玲珑金矿处于冒落松散围岩内的运输主巷重新支护问题,分析该主巷的围岩变形特征,提出合理有效的支护对策。采用岩体地质力学分类法对巷道穿越的围岩进行分级。分析巷道的破坏特征及其破坏原因。提出针对冒落松散围岩巷道的联合支护对策,其特点是:设计采用一种插入两帮岩体内的超前支护支承装置,为超前插杆提供稳固的支承点;采用U型可缩性钢拱架配合两帮外八字形钢管的整体支护结构,以减少两帮松散岩体向巷道内的挤压作用。对重新支护后的巷道进行83天的围岩表面变形监测。结果表明,巷道顶底板累积移近量不超过40 mm,两帮累积移近量不超过25 mm,且日变形速率降至0.15 mm/d,巷道围岩的变形得到有效控制。

To solve the problems of Linglong gold mine in re-supporting the transport roadway surrounded by complicated roof caving and loose rock mass, deformation features were analyzed for adjacent rock . A supporting strategy of roadway was worked out. The geological stratums were first classified by using the rock mass rating method and roadway failure types were analyzed specifically. A combined supporting technique was developed for controlling the roadway deformation in roof caving and loose rock mass. Aiming at providing a stable beating point for advanced support in unstable rock mass, a beating structure was introduced and inserted into the sidewalls of the roadway. U-type scalable steel arch structures together with a row of inserted steel tubes were adopted to reduce the squeezing effect of loose rock mass. An 83 days deformation observation of surrounding rock was conducted after roadway was re-supported. The results indicate that accumulated convergence between roof and floor is less than 40 mm, and accumulated convergence between two sides is less than 25 mm.