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1182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FLAC2D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