期刊
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
卷 137, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijrmms.2020.104569
关键词
Gas; Flow; Bentonite; Modeling; Dilatant; Stress; Pressure
资金
- Andra
- BGR/UFZ
- CNSC
- US DOE
- ENSI
- JAEA
- IRSN
- KAERI
- NWMO
- RWM
- SURAO
- SSM
- Taipower
- Spent Fuel and Waste Science and Technology Campaign, Office of Nuclear Energy, of the U.S. Department of Energy [DE-AC02-05CH11231]
- Lawrence Berkeley National Laboratory
- NERC [bgs06001] Funding Source: UKRI
By applying a coupled multiphase fluid flow and discrete fracturing model, this study simulated gas migration experiments on compacted bentonite. Calibration of model parameters and the establishment of a best-fit conceptual model were necessary to achieve a good match with the experimental results.
A coupled multiphase fluid flow and discrete fracturing model is applied to simulate bench-scale gas migration experiments on compacted bentonite. The numerical modeling is based on the linking of the multiphase fluid flow simulator TOUGH2 with a Rigid-Body-Spring Network model, which enables a discrete (lattice) representation of elasticity and individual fractures. The evolution of a complex network of dilatant flow paths is modeled through opening and breakage of lattice interface bonds between porous-elastic matrix elements. To achieve a good match with the experimental results, including an abrupt gas breakthrough along with pressure and stress responses, it was necessary to calibrate model parameters for (1) air-entry pressure, (2) shear and tensile failure of lattice interface bonds, (3) moisture swelling/shrinkage effects on stress, and (4) aperture-dependent permeability of dilatant flow paths. Our best-fit conceptual model considers a pervasive network of discrete flow paths propagating from the gas injection point, whereas some of the experimental data indicate the potential for heterogeneous and unstable flow paths.
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