沿空留巷底鼓滞后规律的分析与研究

Analysis and Research on Hysteresis Law of Floor Heave of Gob-side Entry Retaining

以乌兰木伦煤矿12407工作面主运顺槽沿空留巷为研究对象,通过理论分析、数值模拟及现场矿压监测,揭示了在回采过程中,沿空留巷底鼓滞后过程的一般规律。研究表明:沿空留巷两侧载荷的分布不均是导致底鼓的直接原因,工作面后方的沿空留巷底板承载载荷,存在着不断积累和转移的过程,这为底鼓出现滞后过程创造了条件。再者通过对综采面进行数值模拟以及12407工作面现场的矿压监测,发现沿空留巷底鼓滞后过程主要包括2个阶段:滞后凸显阶段和滞后稳定阶段。并得到了各阶段的力学特征,可以确定顶板变化及垂向压力的关注范围一般为初始滞后工作面后方10~25 m的一段较短距离;滞后采空区关注底板变化范围为实际工作面后方的中部;日常巷道的监测维护及矿压监测范围一般为底鼓滞后最大距离之后。该研究规律,可为相似工程的综采面沿空留巷支护设计以及巷道的加强支护区域提供参考。

Based on theoretical analysis,numerical simulation and in-situ mine pressure monitoring,reveals the general law of the floor heave hysteresis process in the stoping process by taking the main running groove gob-side entry retaining of 12407 in Wulanmulun coal mine as the research object.The research shows that the uneven distribution of load on both sides of gob retaining roadway is the direct cause of floor heave.The load bearing process of goaf retaining roadway bottom behind the working face is constantly accumulating and transferring,which creates conditions for the lagging process of floor heave.Furthermore,through the numerical simulation of fully mechanized mining face and the mine pressure monitoring of 12407 working face,it is found that the hysteresis process of floor heave along goaf mainly includes two stages:hysteresis prominent stage and hysteresis stable stage.The mechanical characteristics of each stage are obtained,and it can be determined that the concern range of roof change and vertical pressure is generally a short distance of 10-25 m behind the initial lag face.The change range of the floor in the lagging goaf is the middle of the rear of the actual working face.The daily monitoring and maintenance of roadway and mine pressure monitoring range are generally after the maximum lag distance of floor heave.The research law can provide reference for the support design of goaf retaining roadway and strengthening supporting area of roadway in similar projects.