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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 caused by overburden collapse, surface subsidence, mining caused by the strong disturbance of hydropower chambers, subway tunnels and other underground projects can not be compared. In order to study the slip mechanism of the clip-on anchor in coal mine, taking the mining area II82 of Luling Coal Mine as the engineering background, aiming at the violent disturbance of the upper working face in the mining area, finite difference method software FLAC ~ (2D) In the early stage of dynamic disturbance, the difference of media displacements in the deep and shallow surrounding rock leads to the decrease of the load of the anchor cable, and then to the tension effect during the reinforcement of the anchor cable, resulting in the anchor Cable load changes dramatically in a short period of time, and can not be like the constant force to preload the anchor itself, on the contrary will make an instant anchor slippage. Through the combination of extrusion anchors and screw anchors, the problem of slippage of clip anchors under dynamic disturbances is effectively solved and successfully applied in Luling Mine.