Thermo-hydro-mechanical coupled mathematical model for controlling the pre-mining coal seam gas extraction with slotted boreholes

作     者：Xue Yi Gao Feng Gao Yanan Liang Xin Zhang Zhizhen Xing Yan 

作者机构：State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining & Technology Xuzhou 221116 China School of Mechanics & Civil Engineering China University of Mining & Technology Xuzhou 221116 China Rock Mass Modeling and Computational Rock Mechanics Laboratories University of Arizona Tucson AZ 85721 USA 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2017年第27卷第3期

页      面：473-479页

核心收录：

学科分类：0819[工学-矿业工程] 081903[工学-安全技术及工程] 08[工学] 

基　　金：financial support from the National Natural Science Foundation of China (No.51404250) the Fundamental Research Funds for the Central Universities (No.2013QNB19) the Natural Science Foundation of Jiangsu,China (No.BK20140189) the China Postdoctoral Science Foundation (Nos.2014M550315,2014M550316,2016T90526) the College Graduate Research and Innovation Program of Jiangsu Province (No.KYLX15_1408) 

主　　题：Coal seam gasGas extractionThermo hydro mechanical modelSlotted boreholes 

摘      要：Drainage influence radius is the basic parameter for borehole arrangement, while the effect of high pressure water jet slotting technology on borehole drainage influence radius has not been studied systematically. In this paper, a fully thermo-hydro-mechanical(THM) coupled model which represents the non-linear responses of gas extraction was implemented to demonstrate the reliability of this model through history data matching. Based on this model, the susceptibilities of gas extraction with single slotted borehole, including the permeability, the gas pressure, the temperature, the coal adsorption characteristics and the radius of slot, were quantified through a series of simulations. The simulation results revealed that increasing the permeability, initial gas pressure and temperature could develop the influence radius of single slotted borehole. This finite element model and its simulation results can improve the understanding of the coal-gas interactions of underground gas drainage and provide a scientific basis for the optimization of drainage systems.