潘三矿水力冲孔防突技术研究

发布时间：2018-04-27 04:19

本文选题：水力冲孔 + 数值模拟　；参考：《安徽理工大学》2015年硕士论文

【摘要】：煤炭作为基础能源,是我国实现经济可持续发展的基本保证。目前,随着我国煤矿开采深度的增加,大量煤矿将面临低透气性、地应力高、瓦斯含量高、地质情况复杂等严峻问题,严重制约着煤炭安全高效的开采。水力冲孔具有操作简单、安全性高等优势,在高瓦斯低透气性突出煤层中得以广泛应用,且在我国多个矿区取得了较好的消突效果。本文通过查阅资料对现有水力冲孔技术的的研究基础上,了解了水力冲孔水射流的结构特征、几种常见的水射流破煤假说、水射流破煤的过程和影响因素及水力冲孔增透机理。同时,应用ANSYS/LS-DYNA模拟软件对高压水射流破煤的过程及水力冲孔前后钻孔周围煤体应力应变的变化进行了分析。由模拟可知,当水射流压力为10Mpa时,煤体内最终形成漏斗形的破碎坑,煤体以压碎破坏为主,拉伸破坏为辅；水力冲孔后,在地应力的作用下钻孔周围出现了大面积的应力应变集中现象,煤体向钻孔方向移动,在煤体的移动过程中,煤体内部出现拉应力和剪应力,最终导致钻孔周围煤体破碎产生裂隙,煤层的透气性得以增加。最后,在潘三矿进行水力冲孔试验,单孔出煤量达到3t,冲孔过程中,出煤量和水压的关系不单纯是正相关关系,13-1煤最优冲孔水压为10～15MP；出煤总量随着冲孔时间的增加保持递增趋势,至一定程度后逐渐趋于稳定：冲孔后的瓦斯流量衰减系数仅为冲孔前的1、3,煤层透气性显著增加。通过连续37天的瓦斯抽采,冲孔影响半径达到8.5m。通过考察分析,在冲孔影响半径内,煤层的瓦斯压力和瓦斯含量显著下降,瓦斯抽采率高,取得了较好的消突效果。因此,水力冲孔技术值得在低透气性高瓦斯突出煤层推广应用。
[Abstract]:Coal, as the basic energy, is the basic guarantee to realize the sustainable development of economy in our country. At present, with the increase of coal mining depth in China, a large number of coal mines will face serious problems such as low permeability, high in-situ stress, high gas content and complex geological conditions, which seriously restrict the safe and efficient mining of coal. Hydraulic punching has the advantages of simple operation and high safety. It has been widely used in high gas and low permeability outburst coal seams, and has obtained better outburst suppression effect in many mining areas in China. Based on the research of the existing hydraulic punching technology, the structure characteristics of hydraulic punching water jet, several common hypothesis of water jet breaking coal, the process and influencing factors of water jet breaking coal and the mechanism of hydraulic punching antireflection are studied in this paper. At the same time, the process of high pressure water jet breaking coal and the change of stress and strain of coal around borehole before and after hydraulic punching are analyzed by ANSYS/LS-DYNA software. According to the simulation, when the pressure of water jet is 10Mpa, the crater formed in coal body is funnel-shaped, the coal body is mainly crushed, the tensile damage is auxiliary, and after hydraulic punching, Under the action of in-situ stress, a large area of stress and strain concentration appears around the borehole, and the coal moves towards the borehole. During the process of the coal movement, the tensile stress and shear stress appear in the coal body. Finally, the coal body around the borehole is broken, and the permeability of coal seam is increased. Finally, the hydraulic punching test was carried out in Panshan Coal Mine. The coal output of single hole reached 3 t, and during the process of punching, The relation between coal output and water pressure is not only positive correlation relation: the optimal water pressure of coal punching is 1015MP.The total coal output keeps increasing with the increase of punching time. To a certain extent the gas flow attenuation coefficient after punching is only 1 / 3 of that before punching and the permeability of coal seam increases significantly. Through continuous gas extraction for 37 days, the influence radius of punching is up to 8.5 m. Through investigation and analysis, the gas pressure and gas content of coal seam are obviously decreased, the gas extraction rate is high, and good outburst suppression effect has been achieved within the influence radius of punching hole. Therefore, hydraulic punching technique is worth popularizing in low permeability and high gas outburst coal seam.
【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】：TD713.3

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