不同影响期迎采巷道应力演化及分段控制研究

    Research on stress evolution and segmented control of roadways under mining-induced disturbance in different influence periods

    • 摘要: 针对迎采对掘巷道采动影响剧烈、巷道应力环境复杂、围岩难以控制的问题,以旺岭煤矿090211回风巷道为研究对象,采用理论分析、数值模拟以及现场监测的研究手段,对迎采对掘条件下掘进巷道与回采工作面所处不同时空位置关系下巷道的应力演化规律进行研究,提出了迎采对掘全过程不同影响时期巷道的分段动态联合支护方式,并进行现场监测。结果表明:根据回采工作面与掘进巷道的相对位置关系,将迎采对掘巷道的应力演化过程划分为应力平稳、应力非稳定、应力降低3个典型阶段;应力平稳阶段,作用范围为超前工作面50 m以外,巷道垂直应力分布曲线呈对称双峰状,应力分布范围为11.8~13.5 MPa;应力非稳定增长阶段,作用范围为超前工作面50 m至滞后工作面100 m内,巷道垂直应力双峰曲线由对称向非对称转变,工作面侧煤柱最大支承应力为27.1 MPa,较上阶段应力增幅高达67.3%;应力降低阶段,作用范围为滞后工作面100 m之外,回采对巷道影响逐渐减弱,峰值应力逐渐降低;迎采对掘期间巷道超前工作面50 m到滞后工作面100 m为停掘区域,分段联合支护较原支护有效控制了巷道围岩的变形,顶底板及两帮的移近量减少了34%~38%,为迎采对掘条件下巷道的围岩控制提供了一种可行途径。

       

      Abstract: In view of the problems of drastic influence of mining, complex stress environment and difficult to control the surrounding rock, we take 090211 return roadway of Wangling Coal Mine as the research object, and use theoretical analysis, numerical simulation and on-site monitoring as the research means to study the stress evolution law of the roadway under the different spatial and temporal positional relationship between the driving roadway and working face under the condition of facing mining and driving. The segmented dynamic joint support method for the roadway in different influencing periods of the whole process of facing mining and excavation is proposed, and on-site monitoring is carried out. The results show that, based on the relative position relationship between the mining face and the tunneling roadway, the stress evolution process of the roadway being mined towards can be divided into three typical stages, including stress stable stage, unstable stress stage, stress reduction stage. The stress stable stage, with the action range being more than 50 m ahead of the working face, the vertical stress distribution curve of the roadway is in a symmetrical double-peak shape, and the stress distribution range is 11.8 MPa to 13.5 MPa. The unstable stress growth stage, with the action range being from 50 m ahead of the working face to 100 m behind it. The double-peak curve of the vertical stress of the roadway changes from symmetrical to asymmetrical. The maximum support stress of the coal pillar on the working face side is 27.1 MPa, with a stress increase of up to 67.3% compared to the previous stage. The stress reduction stage, with the action range being more than 100 m behind the working face. The influence of mining on the roadway gradually weakens, and the peak stress gradually decreases; the area 50 meters ahead of the working face to 100 meters behind it during the period of advancing towards the mining face is the stop-mining zone; the combined support effectively controlled the deformation of the surrounding rock of the roadway compared with the original support, the segmented approach of the roof and floor as well as the two sides was reduced by 34% to 38%, providing a feasible approach for the control of the surrounding rock of the roadway under the conditions of mining preparation and excavation.

       

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