云驾岭煤矿12303工作面沿空留巷二次采动围岩稳定性研究

发布时间：2018-04-25 22:29

本文选题：沿空留巷 + 围岩变形　；参考：《河北工程大学》2017年硕士论文

【摘要】：本文以云驾岭煤矿12303运输巷为研究背景,通过综合运用理论分析、数值模拟、相似材料模拟实验以及结合现场工业性试验,研究了云驾岭煤矿12303工作面沿空留巷受二次采动影响下,巷道围岩应力分布状态,巷道表面围岩变形规律以及上覆岩层的垮落特征。对不同阶段围岩受力规律进行研究并提出支护方案。通过数值模拟技术建立模型,分析出距工作面不同距离巷道围岩受二次采动影响时垂直应力、垂直位移以及塑性破坏区分规律及范围,通过分析可知在工作面与回风巷交叉位置垂直垂直应力最大,巷道变形最严重区域在距离工作面20m范围内,工作面开采过后以剪切破坏为主,破坏深度在采空区以下20m。从而有针对性的采取措施减小巷道受二次采动的影响。通过相似模拟实验模拟出沿煤层倾斜方向巷道围岩受二次采动影响时覆岩运移规律,通过三位静态变形测量系统对上覆岩层沉降变化进行分析,进而得出巷道受二次采动影响时巷道顶板以整体平行下沉为主且相比一次采动时巷道围岩变形较大。最后通过工业性试验对巷道支护效果进行监测和评价,为高效留巷提供技术保障,为本矿后续巷旁充填体整体设计、参数优化、现场实施等提供理论支持和经验参考。通过现场实测得知受二次采动时工作面距测站10m时巷道围岩变形剧烈仅为初始巷道面积的50%。当巷道受到二次采动时锚杆锚索受力均大于运输巷,为了使留巷更加成功,应注意在工作面前方40m加强锚杆锚索的预紧力,对锚杆、锚索进行二次预紧,使锚固作用达到最佳支护效果。
[Abstract]:This paper takes Yunjialing Coal Mine 12303 Transportation Lane as the research background, through comprehensive application of theoretical analysis, numerical simulation, similar material simulation experiment and field industrial test. Under the influence of secondary mining in 12303 face of Yunjialing Coal Mine, the stress distribution of surrounding rock, the deformation of surrounding rock on the surface of roadway and the collapse characteristics of overlying strata are studied. The stress law of surrounding rock in different stages is studied and the supporting scheme is put forward. Based on the numerical simulation technique, the vertical stress, vertical displacement and plastic failure are analyzed when the surrounding rock of roadway at different distances from the working face is affected by secondary mining. Through analysis, it is known that the vertical vertical stress is the largest in the cross position between the working face and the return air roadway, and the most serious area of roadway deformation is within 20m from the working face. After mining the face is mainly shearing failure and the damage depth is 20m below the goaf. Therefore, measures should be taken to reduce the influence of secondary mining on roadway. The law of overlying rock migration is simulated by similar simulation experiment when the surrounding rock of roadway along the inclined direction of coal seam is affected by secondary mining, and the subsidence change of overlying rock is analyzed by the three-position static deformation measurement system. Furthermore, when the roadway is affected by the secondary mining, the roof of the roadway is mainly parallel subsidence and the deformation of surrounding rock is larger than that of the first mining. Finally, through the industrial test to monitor and evaluate the roadway support effect, to provide the technical support for the high-efficient roadway retention, and to provide theoretical support and empirical reference for the overall design, parameter optimization and field implementation of the backfill body beside the roadway in the mine. It is found that the surrounding rock deformation of the roadway is only 50% of the initial roadway area when the working face is 10 m away from the surveying station when it is subjected to secondary mining. When the roadway is subjected to secondary mining, the force of anchor cable is greater than that of transport roadway. In order to make the roadway stay more successful, we should pay attention to strengthening the pre-tightening force of anchor cable 40 m in front of the face, and carry on the second pre-tightening of anchor rod and cable. The anchoring effect can reach the best support effect.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD322

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