大开度裂隙网络内非线性两相渗流的数值研究

doi:10.13722/j.cnki.jrme.2017.0771

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Abstract It is well known the seepage flow in fractured rock has significant negative effect on the underground mining and cave excavation. While the opening of fractures in surrounding rock is wide and the fractures connect to the water rich stratums under the medium-high pressure，water-related disasters such as the water inrush could occur. A number of works on the seepage flow in fractures have been conducted by previous researchers. However，they were largely based on a single fracture or the simple fracture network，with the simplified cubic law (only suitable for low speed laminar flow) assumed. Therefore，further works need to be conducted on the seepage flow in fractured rocks to consider the effect of the complex fracture networks，the roughness of fractures，the high-speed nonlinear seepage flow and the local turbulent vortex. In this study，the characteristics of the high-speed nonlinear seepage flow through large opening fracture networks in rock is systematically investigated based on the two-phase flow theory using the open source platform OpenFoam (a package of computational fluids dynamics). Computational results precisely captured the process of water entry，air flow and water exit in the fracture networks with large opening. The distribution and variation characteristics of flow velocity are also revealed. Meanwhile，the existence of boundary layer is confirmed. The magnitude of the viscous shear stress in the boundary layers，the Reynolds number of the seepage flow，and the equivalent permeability are all estimated. This study clearly demonstrates that it is feasible to characterize the nonlinear seepage flow in fractured rock at the meter scale adopting the two-phase flow theory.

Key words： rock mechanics two-phase flow fractures networks large opening fractures nonlinear seepage flow Navier-Stokes equation OpenFoam

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	Articles by authors
	ZHANG Yan1
	ZHOU Xuan1
	2
	YE Jianhong2

Cite this article:

ZHANG Yan1,ZHOU Xuan1,2, et al. Numerical analysis of nonlinear two-phase flow within large opening fracture networks in rockmass[J]. , 2018, 37(4): 931-939.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.0771 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/I4/931

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[38] https：//openfoam.org/