千米深井厚煤层开采的冲击地压危险性评价及卸压技术研究

发布时间：2018-05-20 23:44

本文选题：冲击地压 + 危险性评价　；参考：《河北工程大学》2015年硕士论文

【摘要】：针对千米采深厚煤层的107工作面所面临的冲击地压问题,本文依据滕东煤矿的地质构造及生产实际情况,在利用多因素分析法、数值模拟方法、比较分析法及微地震监测技术等研究方法的基础上,对有冲击地压危险性工作面进行前期的危险性评价和后期的防治技术研究,构建出一套适应于深井厚煤层的综合防治冲击地压技术。首先,分别采用综合指数法和可能性指数评价法评价其工作面发生冲击地压危险性的可能性,再利用多因素耦合的评价方法,分别对存在于107工作面的各个冲击地压影响因素的影响性进行分析,并划分出工作面相应的危险区域的范围及其危险程度的大小。其次,利用FLAC3D的数值模拟的方法建立107工作面的数值模型,研究其巷道布置前后和回采过程中应力的分布范围和集中情况,旨在分析工作面回采过程中采动影响而导致的上部岩层变化情况,并研究其应力集中区域和数值大小的变化规律,为后期采取相应的防治措施提供参考。再次,采用比较分析的方法,依据工作面地质条件、回采技术和矿井实际情况,选择采用大直径钻孔卸压的防治冲击地压方法,并建立相应的数值模型,优化出适合107工作面使用的钻孔直径、排间距和布置方式等技术参数,进行合理化的布置,并采用钻屑法验证卸压措施实施后的效果。最后,在回采过程中采用微震监测的方法对“微震事件”进行监测,并依据事件发生的范围、数量及其能量,对107工作面可能发生的危险做到预警,并同时对前期的危险性评价结果进行验证。
[Abstract]:According to the geological structure and actual production situation of Tendong Coal Mine, this paper makes use of multi-factor analysis method and numerical simulation method in view of the impact ground pressure problem faced by 107 working face in deep coal seam in kilometer mining, according to the geological structure and actual production situation of Tendong Coal Mine. On the basis of comparative analysis method and micro-seismic monitoring technology, the pre-risk evaluation and prevention technology of percussive face with rock burst are studied. A set of integrated rock burst prevention and control technology suitable for deep well thick coal seam was constructed. Firstly, comprehensive index method and possibility index method are used to evaluate the possibility of rock burst hazard in working face, and then multi-factor coupling evaluation method is used. The influencing factors of impact ground pressure in 107 working face are analyzed, and the range of the corresponding dangerous area and the magnitude of the dangerous degree of the working face are divided. Secondly, the numerical model of 107-face is established by using FLAC3D's numerical simulation method, and the distribution and concentration of stress before and after the roadway layout and in the mining process are studied. The purpose of this paper is to analyze the change of the upper strata caused by the influence of mining movement in the mining process of the working face, and to study the variation law of the stress concentration area and the numerical value, and to provide a reference for taking the corresponding prevention measures in the later stage. Thirdly, adopting the method of comparative analysis, according to the geological condition of working face, mining technology and the actual situation of mine, the method of preventing and controlling the impact ground pressure is selected and the corresponding numerical model is established. The technical parameters of drilling hole diameter, row spacing and layout mode suitable for 107 working face were optimized, and reasonable arrangement was carried out, and the effect of pressure relief measures was verified by drilling cuttings method. Finally, the microseismic monitoring method is used to monitor the "microseismic events" in the process of mining, and according to the range, quantity and energy of the events, the danger that may occur in the 107 working face can be forewarned. At the same time, the risk assessment results are verified.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD324

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