大埋深跨采巷道变形机理分析

巷道受采动影响时,应力重新分布,围岩处于卸压状态,导致巷道变形严重。针对这一现象,在华恒煤矿-1000m水平副暗斜井,利用现场实时在线监测数据和数值模拟计算,分析了跨采巷道随采煤工作面推进的变形破坏规律。监测数据表明,巷道变形包括顶板下沉、两帮移近和底鼓,其中底板变形破坏最严重。数值模拟分析得出,跨采后的巷道底板和右帮塑性区范围比跨采前有较大增长;在巷道顶底板处,围岩垂直应力处于卸压状态,水平应力出现应力集中现象。垂直应力的卸压和水平应力的横向作用是造成巷道底鼓的力学原因,底板没有采取支护措施是造成底鼓的直接原因。

Analysis on Deformation Mechanism of Deep Roadway in Crossing Mining

Crossing mining roadways are liable to be severely deformed with the influence of abutment pressure in crossing mining when the stress of surrounding rock is redistributed. To solve the problem, the methods of real time online monitoring system and numerical simulation were employed to analyze the laws of roadway deformation during crossing mining in --1000 Deputy inclined shaft roadway of Huaheng coal mine. The Monitoring data show that the deformations include the roof subsidence, two sides crowding and the floor heaving, and deformation of the bottom floor is the most serious. The numerical simulation results show that plastic area of the floor increases, the vertical stress of surrounding rock is in the unloading state, and horizontal stress appears to concentrate in the roof and floor. The vertical stress relief and the lateral effect of horizontal stress are the mechanical causes of roadway floor heave while the lack of supporting measures in floor is the direct cause of the floor heave.