期刊
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
卷 149, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijrmms.2021.104964
关键词
Combined finite-discrete element method; Thermal-hydro-mechanical (THM) coupling; Rock cracking; Hydraulic fracturing; Enhanced geothermal system (EGS)
资金
- National Natural Science Foundation of China [11872340]
- Hong Kong Scholars Program by China National Postdoctoral Council [XJ2019040, HKSP19EG04]
- Hong Kong Research Grants Council [N_HKUST621/18]
- Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) [CUGGC09]
A coupled thermal-hydro-mechanical (THM) model based on the combined finite-discrete element method (FDEM) is proposed for simulating rock cracking driven by multi-physics. By simulating the interaction between thermal, hydraulic, and mechanical processes, the study shows that branching fractures can be produced in addition to the primary fracture during hydraulic fracturing.
A coupled thermal-hydro-mechanical (THM) model based on the combined finite-discrete element method (FDEM) is presented for simulating rock cracking driven by multi-physics. The THM model contains three parts: a fracture-pore mixed seepage model, a heat transfer model, and a fracture mechanics calculation model. By combining any two of the above three models, a coupled thermal-mechanical (TM) model, a coupled hydrothermal (TH) model, and a coupled hydromechanical (HM) model are constructed. Then, the TM model, TH model, and HM model are combined to build the THM model, which is implemented in a GPU parallel multiphysics finite-discrete element software, namely MultiFracs. Finally, we use this THM model to study the hydraulic fracturing process of hot dry rock. The simulation results indicate that in addition to the primary fracture perpendicular to the direction of the minimum in situ stress, branching fractures along the direction of the minimum in situ stress are also produced during the hydraulic fracturing process. The proposed THM model can simulate heat and fluid transfer in fractured reservoirs, crack initiation, propagation, and intersection.
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