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| Development of dynamic monitoring test system for coal and rock hydraulic wetting range under true three-dimensional stresses |
| CHENG Weimin1，2，LI Huaixing1，2，LIU Yixin1，2，WANG Gang1，2，HUANG Qiming1，2 |
| (1. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology，Shandong University of Science and Technology，Qingdao，Shandong 266590，China；2. College of Safety and Environmental Engineering，Shandong University of Science and Technology，Qingdao，Shandong 266590，China) |
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Abstract In order to study the mechanical properties and seepage wetting law of coal and rock under the complex stress environment of deep coal seams，a dynamic monitoring test system for the hydraulic wetting range of coal and rock under true three-dimensional stresses is independently developed. The system is mainly composed of a stress loading system，a hydraulic servo system，a data acquisition and control system and an acoustic emission monitoring system. The system has the capabilities of carrying out experimental research on coal and rock under different ground stresses，different fluid pressures，different mining stresses，different temperatures and other multi-field coupling conditions，conducting the hydraulic fracturing test of coal and rock under different ground stresses，different fluid pressures and different temperature conditions in order to study crack initiation position and crack propagation of coal and rock，performing the anisotropic seepage test of multi-phase fluid including water and gas under different geostresses and different mining stress to study the influence of the anisotropy of samples on the seepage effect in-depth，and carrying out wetting test research of liquid phase fluid in porous media under different ground stress and mining stress conditions for analyzing the dynamic wetting range and wetting process of the liquid phase fluid under different fluid pressures combined with acoustic wave test. The innovation and advancement of the system include fully sealed design. Specifically，a spherical acoustic emission probe is installed at the front end of the water injection pipe，an acoustic wave sensor is installed on the pressure head to receive excitation signal from the spherical acoustic emission probe，and the sample is individually fixed and sealed with a detachable indenter，ensuring the overall sealing of the sample under the normal operation of the acoustic emission system. The accuracy and reliability of the system are verified through a series of tests. This system provides a new method for studying the law and change mechanism of the whole process of coal and rock hydraulic fracturing，seepage and wetting under the condition of multi-field and multi-phase coupling.
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2022, Vol. 41 
