标题：Technology for monitoring wetting range of true-triaxial coal seam water injection based on acoustic emission array
作者：Cheng, Weimin ;Chen, Jian ;Wang, Gang ;Fan, Jiuyuan ;Hu, Yanwei
作者机构：[Cheng, Weimin ;Wang, Gang ] Shandong Universityof Scienceand Technology, Mine DisasterPrevention and Control-Ministry of State Key Laboratory Breedin 更多
会议名称：53rd U.S. Rock Mechanics/Geomechanics Symposium
会议日期：June 23, 2019 - June 26, 2019
来源：53rd U.S. Rock Mechanics/Geomechanics Symposium
摘要：Coal seam water injection is an important technological means for coal mines to control disasters such as mine gas, coal dust, and ground stress. At present, advanced true triaxial fracturing and wetting equipment is generally used for experiments on coal seam water injection mechanism. Monitoring the wetting range of water injection is key to study the anisotropic coal seam wetting law, water–gas displacement mechanism, pore fracture structure wetting characteristics, and other important theories. However, only a few studies are conducted on high-precision monitoring of sample wetting range. This work put forwards direct measurement method and envelope localization method, which are two independently designed true triaxial fracturing wettability range monitoring methods based on the acoustic emission array technology. The two methods exhibit high detection and recognition accuracy. A verification test was carried out in the non-confined state, and the selected data were analyzed using MATLAB.And use these two methods to locate the wetting contour surface. The feasibility of the two schemes is determined through analysis, and the methods, which are supported by the acoustic emission array method, can monitor the wetting law of coal seamwater injection.
Copyright 2019 ARMA, American Rock Mechanics Association.