Journal
COMPUTERS AND GEOTECHNICS
Volume 94, Issue -, Pages 118-133Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compgeo.2017.09.002
Keywords
Hydraulic fracturing; Effective stress; Deformation reinforcement theory; Unbalanced force; Finite element method
Categories
Funding
- National Natural Science Foundation of China [51709281, 51739006, 11572174, 51579252, 51439005, 51779277]
- National Key Research and Development Project of China [2016YFB0201000]
- Special Scientific Research Project of the State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin [2016ZY10]
- Special Scientific Research Project of the China Institute of Water Resources and Hydropower Research [SS0145B392016, SS0145B612017, SS0145B322017]
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The effective stress principle of Biot's consolidation theory is first introduced into deformation reinforcement theory to model directional hydraulic fracturing. The unbalanced force considering the effective stress of fluid is derived and a more effective vector type criterion of hydraulic fracture initiation and propagation is proposed. The unbalanced force magnitude indicates the fracture degree and direction clearly indicates the fracture propagation direction. The new theory and method is first implemented into 3D finite element and the numerical modeling is verified by true tri-axial experiments. The investigation results indicate that unbalanced force can track and locate the hydraulic fracture propagation well. (C) 2017 Elsevier Ltd. All rights reserved.
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