摘要
离散元模拟表明锚杆支护回采巷道层状结构顶板形成组合铰接拱结构 ,锚杆支护机理相应称为组合铰接拱作用。竖直方向地应力使顶板岩层形成铰接拱结构 ,水平地应力是拱铰压碎的主要力源。分析了侧压力系数、锚杆长度、岩层厚度等因素对顶板稳定性的影响规律 ,表明当最大水平地应力可造成顶板破坏而最小水平地应力不能造成顶板破坏时 ,调整巷道走向与最大主应力平行有利于顶板稳定 ;锚杆长度为巷道跨度的 1/
The discrete element simulation showed the bedded roof of the mining gateway supported with bolts was in a combined jointed arch structure. The paper analyzed the side pressure parameter, bolt length, thickness of the rocks and other factors influenced to the stability of the roof. The analysis results showed that the roof were failed when a max horizontal ground stress occurred and the roof were not failed when a min horizontal ground stress occurred. The strike of the gateway parallel to the max main stress will be favorable to the stability of the gateway.
出处
《煤炭科学技术》
CAS
北大核心
2004年第6期65-67,52,共4页
Coal Science and Technology
关键词
层状结构
锚杆支护
支护机理
地应力
回采巷道
bedded structure
bolt support
support mechanism
ground stress
mining gateway
