水压调控下超声对煤体结构及渗透特性的影响规律研究OA
Study on the influence law of ultrasound on coal structure and seepage characteristics under water pressure regulation
超声增透技术在煤层增渗领域应用潜力巨大,而水环境是超声激励作用的重要介质和能量传递载体.为探究环境水压影响下超声激励诱导的煤体结构损伤劣化程度及煤体渗透性的演化规律,针对彬长矿区胡家河矿瓦斯难抽问题,选取胡家河矿 402101 工作面典型煤样,利用 BRS-Ⅲ型气体孔渗联测仪,测定不同水压和超声作用下煤体的渗透率,并采用 ImageJ 图像处理软件,定量表征超声激励前后煤体表面的损伤程度,探究水压和超声作用对 402101 工作面煤体结构损伤及渗流特性的影响.结果表明:随着环境水压的升高,在超声激励作用下,煤体表面产生了多方向性裂隙,表面粗糙度增大;带压超声激励后,煤体的裂隙开度与长度均有所增加,损伤面积占比显著提升(由 0 MPa 时的 1.271％增至 0.3 MPa 时的 21.513％);超声激励使煤体孔裂隙结构发育沟通,形成复杂的裂隙网络,煤体渗透性提高;激励前后渗透率变化率随水压增大显著提高,变化范围由 6.8％～48.7％增至 415.9％～2 251.8％;煤体的渗透特性与损伤劣化程度呈现出显著的正相关关系;在一定水压范围内,带压超声可促使煤体孔隙、裂隙不同程度发育,提高煤储层渗透率.
Ultrasonic permeability enhancement technology has great application potential in coal seam permeability improvement,and water environment serves as an important medium and energy transfer carrier for ultrasonic excitation.To investigate the degree of coal structural damage and degradation and the evolution law of coal permeability induced by ultrasonic excitation under the influ-ence of ambient water pressure,this study targets the difficult gas extraction problem in Hujiahe Mine of Binchang Mining Area.Typical coal samples from the 402101 working face of Hujiahe Mine were selected.The permeability of coal under different water pressures and ultrasonic actions was measured using a BRS-Ⅲ gas pore-permeability combined tester.ImageJ image processing soft-ware was employed to quantitatively characterize the damage degree of coal surfaces before and after ultrasonic excitation,and the effects of water pressure and ultrasonic action on coal structural damage and seepage characteristics of the 402101 working face were explored.The results show that with the increase of ambient water pressure,multi-directional fractures are generated on the coal sur-face under ultrasonic excitation,and the surface roughness increases.After pressurized ultrasonic excitation,both the aperture and length of coal fractures increase,and the proportion of damaged area rises significantly(from 1.271％at 0 MPa to 21.513％at 0.3 MPa).Ultrasonic excitation promotes the development and connection of coal pore-fracture structures,forming a complex fracture network and improving coal permeability.The permeability change rate before and after excitation increases significantly with the rise of water pressure,with the variation range expanding from 6.8％-48.7％to 415.9％-2 251.8％.The permeability characteristics of coal show a significant positive correlation with the degree of damage and degradation.Within a certain water pressure range,pres-surized ultrasound can promote the development of coal pores and fractures to varying degrees and enhance the permeability of coal reservoirs.
焦彪;宋继斌;赵政舵;汪虎;叶志;阮淼;张玉明;刘鹏;李全贵
陕西彬长胡家河矿业有限公司,陕西 咸阳 713600重庆大学 资源与安全学院,重庆 400044||重庆大学 煤矿灾害动力学与控制全国重点实验室,重庆 400044重庆大学 资源与安全学院,重庆 400044||重庆大学 煤矿灾害动力学与控制全国重点实验室,重庆 400044陕西彬长胡家河矿业有限公司,陕西 咸阳 713600陕西彬长胡家河矿业有限公司,陕西 咸阳 713600陕西彬长胡家河矿业有限公司,陕西 咸阳 713600陕西彬长胡家河矿业有限公司,陕西 咸阳 713600重庆大学 资源与安全学院,重庆 400044||重庆大学 煤矿灾害动力学与控制全国重点实验室,重庆 400044重庆大学 资源与安全学院,重庆 400044||重庆大学 煤矿灾害动力学与控制全国重点实验室,重庆 400044
矿业与冶金
煤层增透超声激励环境水压渗透率孔裂隙劣化损伤
coal seam permeability improvementultrasonic excitationambient water pressurepermeabilitypore fracturedegrad-ation damage
《煤矿安全》 2026 (6)
59-68,10
国家自然科学基金面上资助项目(52474210)
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