一体化封孔装置的封孔参数研究

发布时间：2018-02-12 02:41

本文关键词： 封孔装置瓦斯抽采密封性带压封孔　出处：《安徽理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：打钻预埋管抽采是我国煤矿瓦斯治理的主要技术方法之一,但当前瓦斯抽采钻孔封孔质量差,导致钻孔抽采瓦斯浓度低,钻孔有效工作时间短。为了能够提高钻孔封孔质量,研制了一体化封孔装置并对其封孔参数进行研究。首先,本文对煤矿井下钻孔围岩应力分布情况进行了理论分析,并结合数值模拟软件Flac3d模拟了钻孔围岩应力分布情况,得出从钻孔径向向外可以划分四个区域：破碎区、塑性区、弹性区和原岩应力区,其中破碎区对钻孔密封有重要的影响。其次,在分析钻孔封孔最佳深度的基础上,利用Flac3d模拟采动影响下煤(岩)体中最佳封孔深度,得出煤层顺层钻孔中,封孔深度为距离巷壁平行工作面处10-27m,穿层钻孔封孔深度为距底抽巷巷顶距离11-19m。第三,依据对钻孔裂隙进行密封的要求,一体化封孔装置采用的是带压封孔,其目的是促使浆液扩散进入破碎区,固化破碎区煤岩体达到提高密封性的目的。采用UDEC软件模拟不同钻孔注浆压力条件下,其浆液在煤岩体中的扩散范围大小,选择扩散范围最大的注浆压力作为钻孔最佳的注浆压力,得出煤层钻孔注浆压力为0.6Mpa,岩层钻孔注浆压力为1.4Mpa。最后,由理论结合数值模拟得出的一体化封孔装置的封孔参数后,进行了煤矿现场试验考察,得出了相比于传统的封孔技术,该封孔装置具有一定的优势。但该封孔装置的应用效果在不同试验地点又有不同的抽采效果,通过这一现象,分析了抽采点的地质情况,发现封孔装置的应用效果受地质影响较大。从总体情况看,该封孔装置封孔效果较好。
[Abstract]:Drilling and pre-burying pipe drainage is one of the main technical methods for gas control in coal mines in China. However, the quality of sealing holes in gas extraction holes is poor at present, which results in low gas concentration and short effective working time of boreholes. An integrated sealing device was developed and its sealing parameters were studied. Firstly, the stress distribution of borehole surrounding rock is analyzed theoretically in this paper. Combined with numerical simulation software Flac3d, the stress distribution of borehole surrounding rock is simulated. It is concluded that four regions can be divided from borehole radial to outer: broken area. Plastic zone, elastic zone and original rock stress zone, in which broken zone has important influence on borehole sealing. Secondly, on the basis of analyzing the optimum depth of borehole sealing, Flac3d is used to simulate the optimum depth of hole sealing in coal (rock) body under the influence of mining, and the results show that, The depth of sealing hole is 10 ~ (-27) m from the parallel face of roadway wall, and the depth of hole sealing is 11-19 m from the top of bottom drawing roadway. Thirdly, according to the requirement of sealing the borehole fissure, the integrated sealing device adopts the pressured hole sealing device, which aims to promote the slurry diffusion into the broken area. In order to improve the sealability of coal and rock mass in solidified and broken area, UDEC software is used to simulate the diffusive range of slurry in coal and rock mass under different grouting pressure. When the grouting pressure with the largest diffusion range is chosen as the best grouting pressure for drilling, it is concluded that the grouting pressure of coal seam drilling is 0.6 Mpaand that of rock stratum is 1.4 Mpa. Finally, after the hole sealing parameters of the integrated sealing device obtained by theoretical and numerical simulation, the field test investigation of coal mine was carried out, and compared with the traditional sealing technology, This sealing device has some advantages, but the application effect of the sealing device has different extraction effect in different test sites. Through this phenomenon, the geological situation of pumping point is analyzed. It is found that the application effect of the sealing device is greatly affected by geology, and from the overall situation, the sealing effect of the sealing device is better.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD712.6

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