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Hydro-mechanical coupled modeling of hydraulic fracturing using the mesh fragmentation technique

Journal Article · · Computers and Geotechnics
 [1];  [2];  [3];  [3];  [4];  [4]
  1. São Paulo State University (UNESP) (Brazil); OSTI
  2. São Paulo State University (UNESP) (Brazil)
  3. Texas A & M Univ., College Station, TX (United States)
  4. Federal University of Pernambuco (Brazil)

The inclusion of special interface elements between standard finite elements is becoming a common technique to model discontinuities in porous media using the finite element method (FEM). Recently, it was proved that high aspect ratio (HAR) elements can reproduce very satisfactorily the main features of behavior observed in a single hydraulically-induced fracture. In this paper, the mesh fragmentation technique (MFT) is proposed to extend the application of HAR elements to simulate more general problems involving the formation of hydraulic fractures in rocks by introducing this type of element in-between the standard FE of a typical mesh. The proposed framework makes use of standard FE techniques. Therefore, it is relatively easy to upgrade an existing FE program for continuous porous media to deal with evolving discontinuities. The proposed approach is verified and validated against available analytical and numerical solutions. The crack patterns predicted by the MFT are also compared with the ones observed in the laboratory. The formation of multiple fractures is also analyzed. In all cases, the proposed technique was able to properly capture the main features of rock behavior subjected to hydraulic fracturing.

Research Organization:
Texas A & M University, College Station, TX (United States). Texas A & M Engineering Experiment Station
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE)
Grant/Contract Number:
NE0008762
OSTI ID:
1801294
Alternate ID(s):
OSTI ID: 1777559
Journal Information:
Computers and Geotechnics, Journal Name: Computers and Geotechnics Journal Issue: C Vol. 124; ISSN 0266-352X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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