A 2D, fully-coupled, hydro-mechanical, FDEM formulation for modelling fracturing processes in discontinuous, porous rock masses

详细信息    查看全文

• 作者：A. Lisjak^a ; ^{andrea.lisjak@geomechanica.com" class="auth_mail" title="E-mail the corresponding author} ; P. Kaifosh^a ; L. He^a ; B.S.A. Tatone^a ; O.K. Mahabadi^a ; G. Grasselli^b
• 关键词：Hydro-mechanical (HM) coupling ; Numerical modelling ; Finite-discrete element method (FDEM) ; Rock fractures ; Hydraulic fracturing ; Fluid flow
• 刊名：Computers and Geotechnics
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：81
• 期：Complete
• 页码：1-18
• 全文大小：3495 K

文摘

This paper presents a new, fully-coupled, hydro-mechanical (HM) formulation for a finite-discrete element method computer code. In the newly-developed, hydraulic solver, fluid flow is assumed to occur through the same triangular mesh used for the mechanical calculations. The flow of a viscous, compressible fluid is explicitly solved based on a cubic law approximation. The implementation is verified against closed-form solutions for several flow problems. The approach is then applied to a field-scale simulation of fluid injection in a jointed, porous rock mass. Results show that the proposed method can be used to obtain unique geomechanical insights into coupled HM phenomena.