采动影响下工作面深孔注水非线性渗流规律

发布时间：2018-05-26 13:47

本文选题：采动 + 工作面　；参考：《煤炭学报》2017年S1期

【摘要】：针对采煤工作面深孔注水渗流理论方面仍存在不足,在分析了工作面应力分布状态及其对煤层注水特性影响的基础上,基于渗流力学理论对煤层注水非线性渗流方程进行简化与求解,通过分析其解的特性研究了注水压头、渗流速度、注水流量等的时空演化规律,并通过工作面注水实例对本文所得理论进行了验证。研究结果表明:深孔注水区域内的煤体处于卸载破坏区,该区域内的注水过程属于渗流层流,沿钻孔径向方向上的水力压头具有余误差函数特性,其渗流边界的扩展速度及钻孔注水流量均随时间逐渐减小;而沿钻孔深度方向上,随着煤体的渗透率的逐渐降低,钻孔周边的渗流速度逐渐减小,煤体的润湿程度也逐渐降低。
[Abstract]:In view of the deficiency in the theory of deep hole water injection seepage in coal mining face, this paper analyzes the stress distribution state of coal face and its influence on the characteristics of coal seam water injection. Based on the seepage mechanics theory, the nonlinear seepage equation of coal seam water injection is simplified and solved. By analyzing the characteristics of the solution, the temporal and spatial evolution laws of water injection head, seepage velocity and water injection flow rate are studied. The theory obtained in this paper is verified by the example of face water injection. The results show that the coal body in the deep hole water injection area is in the unloading failure zone, and the water injection process in this area belongs to the seepage laminar flow, and the hydraulic head along the radial direction of the borehole has the characteristics of residual error function. In the direction of borehole depth, the percolation velocity of the percolation boundary and the water injection rate of the borehole gradually decrease with the decrease of the permeability of the coal body, the percolation velocity around the borehole decreases gradually, and the wetting degree of the coal decreases gradually.
【作者单位】：中国矿业大学(北京)资源与安全工程学院;华北科技学院安全工程学院;
【基金】：国家自然科学基金资助项目(51274206)
【分类号】：TD714.4

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