Hydro-mechanical modeling of impermeable discontinuity in rock by extended finite element method

被引：0
|
作者：
An-xing Zheng
Xian-qi Luo
机构：
[1] Shanghai Jiao Tong University,School of Naval Architecture, Ocean and Civil Engineering
来源：
Journal of Central South University | 2015年 / 22卷
关键词：
extended finite element method; crack; hydraulic fracture; fluid flow; coupling model; impermeable discontinuities;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The extended finite element method (XFEM) is a numerical method for modeling discontinuities within the classical finite element framework. The computation mesh in XFEM is independent of the discontinuities, such that remeshing for moving discontinuities can be overcome. The extended finite element method is presented for hydro-mechanical modeling of impermeable discontinuities in rock. The governing equation of XFEM for hydraulic fracture modeling is derived by the virtual work principle of the fracture problem considering the water pressure on crack surface. The coupling relationship between water pressure gradient on crack surface and fracture opening width is obtained by semi-analytical and semi-numerical method. This method simplifies coupling analysis iteration and improves computational precision. Finally, the efficiency of the proposed method for modeling hydraulic fracture problems is verified by two examples and the advantages of the XFEM for hydraulic fracturing analysis are displayed.
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页码：4337 / 4346
页数：9
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