冲击扰动对超低摩擦型冲击地压影响分析

doi:10.13722/j.cnki.jrme.2018.0922

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摘要高地应力和开采强扰动下，深部煤岩体极易发生超低摩擦效应，继而诱发超低摩擦型冲击地压。通过建立考虑上覆岩层压力的块系岩体超低摩擦效应理论模型，对块体逐一进行受力分析，推导得到块体间新法向力公式和工作块体新水平位移公式，理论分析其受垂直和水平双向扰动后的动力响应，获得法向力最小值在各块体间的分布特征及水平冲击载荷频率和延迟时间对工作块体水平位移影响规律。研究表明：最容易发生超低摩擦效应的接触面位置为离垂直冲击源最近的3个接触面。块体间法向力减小导致块体间摩擦力降低，如遇水平扰动，极易诱发超低摩擦型冲击地压。水平冲击幅值确定时，工作块体水平运动存在特定的延迟时间及水平冲击频率范围，且工作块体的水平位移随延迟时间及水平冲击幅值的变化呈现周期性变化规律。发现工作块体水平运动开始时刻滞后于水平冲击作用时刻，存在滞后时间，其后将依次经历变加速和变减速运动，最终处于静止状态。块体间法向力变化是超低摩擦效应发生的前提条件，水平扰动是引起工作块体水平位移的直接原因。

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	李利萍1
	李卫军1
	潘一山1
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关键词 ：岩石力学, 超低摩擦效应, 冲击载荷, 冲击地压, 块系岩体, 法向力, 水平位移

Abstract：Under high in-situ stresses and strong excavation disturbance，anomalously low friction effect is prone to occur in deep coal and rock mass，and then results in the anomalously low friction rock burst. A theoretical model was established for anomalously low friction effect of block rock with overburden pressures，and formulas for calculating the normal force between blocks and the horizontal displacement of working blocks were derived based on force analysis of blocks. Theoretical analysis of dynamic responses resulted from vertical and horizontal disturbances was conducted. The distribution of the minimum normal force between blocks，and the influence of the horizontal impact loading frequency and the delay time on the horizontal displacement of the working blocks were investigated. The results show that the position，where the anomalously low friction effect is prone to occur，locates at the three interfaces closest to the vertical impact source. The reduction of the normal force will lead to the reduction of the friction between blocks，and the anomalously low friction type of rock burst is easily caused by horizontal disturbances. When the horizontal impact amplitude is determined，the horizontal motion of the working block exists a specific delay time and a range of horizontal impact frequency. The horizontal displacement exhibits a periodic variation with the delay time and the horizontal impact amplitude. The starting time of the horizontal motion of the working block lags the horizontal impact time. The working block will experience variable acceleration and deceleration motions，and finally be in a stationary state. The variation of the normal force between blocks is the prerequisite for the anomalously low friction effect，and the horizontal disturbance is the main factor causing the horizontal displacement of the working blocks.

Key words： rock mechanics anomalously low friction effect impact loading rock burst block rock normal force horizontal displacement

引用本文:

李利萍1，李卫军1，潘一山1，2. 冲击扰动对超低摩擦型冲击地压影响分析[J]. 岩石力学与工程学报, 2019, 38(1): 111-120.
LI Liping1，LI Weijun1，PAN Yishan1，2. Influence of impact disturbance on anomalously low friction rock bursts. , 2019, 38(1): 111-120.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0922 或 http://www.rockmech.org/CN/Y2019/V38/I1/111

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