动力扰动下单孔夹片式锚具滑移机制研究  

Slip mechanism of wedge and barrel anchorages under dynamic disturbance

作　　者：马振乾[1] 姜耀东[2,3] 杨英明[1] 张科学[1] 

机构地区：[1]中国矿业大学资源与安全工程学院,北京100083 [2]中国矿业大学力学与建筑工程学院,北京100083 [3]中国矿业大学煤炭资源与安全开采国家重点实验室,北京100083

出　　处：《岩石力学与工程学报》2016年第A01期3042-3050,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展计划(973)项目(2010CB226800)~~

摘　　要：煤炭开采引起覆岩垮落、地表沉降,开采引起的强烈扰动是水电硐室、地铁隧道等其他地下工程所不能比拟的。为研究煤矿夹片式锚具的滑移机制,以芦岭煤矿II82采区为工程背景,针对采区巷道受上方工作面扰动剧烈的特点,采用有限差分法软件FLAC^(2D)从动力扰动的角度分析锚具滑移机制,认为在动力扰动初期,围岩深部和浅部介质位移的差异导致锚索载荷先减小,随后在锚索发挥加固作用的过程中又受到拉力作用,造成锚索载荷在短时间内剧烈变化,并不能像恒力加载那样使锚索自身预紧,相反会使锚具瞬间产生滑移。通过采用挤压锚具和螺纹锚具两者相结合的方式,有效解决了动力扰动下夹片式锚具滑移的问题,并在芦岭煤矿得到成功应用。Coal mining could cause rock collapses and surface subsidence, other underground engineering, such as hydropower chambers and subway tunnels, are noncomparable with the intense disturbance induced by coal mining. In order to study the slip mechanism of wedge and barrel anchorages under dynamic disturbance, this paper takes II82 mining area in Luling coal mine as engineering background. II82 pedestrian rise was subjected to severe disturbance of upper working faces, so the slip mechanism of wedge and barrel anchorages was analyzed from the aspect of dynamic disturbance by using finite difference method software FLAC2D. The results show that in early dynamic disturbance the displacement differences of shallow and deep medium in surrounding rock lead to the anchor cable load reduce, and then it was in tension in the process of reinforcement. The dramatic changes in anchor cable load could not make the anchor cable pre-tightening like constant loading, on the contrary, the anchorage was broken by instant slip. The problem of effectively solved by combining extrusion anchorage and Luling coal mine anchorage slip under dynamic disturbance could be screw anchorage, and it was successfully applied in

关 键 词：采矿工程 夹片式锚具 滑移机制 动载扰动 

分 类 号：TD32[矿业工程—矿井建设]