Modeling of coupled Darcy-Forchheimer flow in fractured porous media and its engineering application

被引：0
|
作者：
Xiong F. [1 ]
Jiang Q.-H. [2 ]
Chen S.-Y. [3 ]
Hu X.-C. [4 ]
机构：
[1] Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan
[2] School of Civil Engineering, Wuhan University, Wuhan
[3] Inst. of Defence Eng., AMS, PLA, Beijing
[4] The Civil Engineering Group Corporation of China Second Engineering Bureau Ltd., Beijing
来源：
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | 2021年 / 43卷 / 11期
关键词：
Coupled Darcy-Forchheimer flow; Finite volume method; Fractured porous medium; Nonlinear flow in tunnel;
D O I：
10.11779/CJGE202111010
中图分类号：
学科分类号：
摘要：
Aiming to solve the nonlinear flow in fractured porous media, the coupling characteristics between Darcy flow in pores and Forchheimer flow in fractures are described by means of the pressure transfer function. The finite volume numerical form of seepage equations is derived, and the corresponding numerical code is written. The flow solution by the proposed method for single fracture and intersecting fracture is verified against Frih and Arraras' solution. Based on this method, the fluid flow behavior of a fractured rock deep-buried tunnel is simulated, which shows it has strong applicability to flow in complex fracture system. The nonlinear flow of tunnel is also analyzed. The results show that the hydraulic gradient of surrounding rock is characterized by "large at bottom and small at top", with the maximum difference of 2.5 times. Therefore, the flow rate at the bottom of the tunnel is greater than that at the top. The distribution homogeneity and density of fracture are the important factors that affect the hydraulic behavior of fractured rock tunnels. At certain water pressure, the more fractures concentrated in the direction of water pressure and the greater the density is, the greater the surrounding rock conductivity is and the greater the flow rate of tunnel is. In this condition, water-inflow accident of tunnels will be prone to occur. The research results may provide reference for the waterproof design and engineering practice of fractured rock tunnels. © 2021, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.
引用
收藏
页码：2037 / 2045
页数：8
相关论文
共 23 条
  • [1] LEI Q H, LATHAM J P, TSANG C F., The use of discrete fracture networks for modelling coupled geomechanical and hydrological behaviour of fractured rocks, Computers and Geotechnics, 85, pp. 151-176, (2017)
  • [2] MAO Chang-xi, CHEN Ping, LI Zu-yi, Et al., Study on computation methods of seepage flow in fractured rock masses, Chinese Journal of Geotechnical Engineering, 13, 6, pp. 1-10, (1991)
  • [3] ZHANG You-tian, Analysis on several catastrophic failures of hydraulic projects in view of rock hydraulics, Journal of Hydraulic Engineering, 34, 5, pp. 1-10, (2003)
  • [4] ZHOU Zhi-fang, WANG Jin-guo, Theory of Dynamics of Fluids in Fractured Media, (2004)
  • [5] HUYAKORN P S, LESTER B H, FAUST C R., Finite element techniques for modeling groundwater flow in fractured aquifers, Water Resources Research, 19, 4, pp. 1019-1035, (1983)
  • [6] ATHANI S S, SHIVAMANTH, SOLANKI C H, Et al., Seepage and stability analyses of earth dam using finite element method, Aquatic Procedia, 4, pp. 876-883, (2015)
  • [7] MARYSKA J, SEVERYN O, VOHRALIK M., Numerical simulation of fracture flow with a mixed-hybrid FEM stochastic discrete fracture network model, Computational Geosciences, 8, 3, pp. 217-234, (2005)
  • [8] WANG En-zhi, Network analysis and seepage flow model of fractured rockmass, Chinese Journal of Rock Mechanics and Engineering, 12, 3, pp. 214-221, (1993)
  • [9] HE Yang, CHAI Jun-rui, TANG Zhi-li, Et al., Numerical analysis of 3-D unsteady seepage through fracture network in rock mass, Journal of Hydrodynamics (SerA), 22, 3, pp. 338-344, (2007)
  • [10] LI Hai-feng, ZHANG Guo-xin, ZHU Yin-bang, Three-dimensional seepage network searching of fractured rock mass and steady seepage field analysis, Chinese Journal of Rock Mechanics and Engineering, 29, S2, pp. 3447-3454, (2010)
123