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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摘要裂隙渗流对矿产地下巷道开采、水电洞室开挖等工程具有重要的不利影响。当围岩扰动裂隙带内的裂隙开度较大，且与中～高压含水地层发生水力连通，就会形成高速非线性渗流导致的涌水、突水等灾害。前人对裂隙岩体渗流开展了卓有成效的研究工作，但基本上都针对单裂隙或简单交叉裂隙，以及采用简化的适用于低速层流的立方定律来描述渗流过程；对复杂裂隙网络、裂隙粗糙度、高速非线性渗流、局部湍流等问题有待于进一步开展工作。本文采用两相流理论，利用计算流体动力学开源软件平台OpenFoam为研究工具，系统地研究包含大开度裂隙网络的岩体内部的高速非线性渗流的过程特征。计算结果精细地捕捉到了大开度裂隙网络高速渗流的进水、驱气、出水过程；揭示了渗流速度的分布、变化特征。同时还确认裂隙渗流中边界层的存在，给出边界层内的黏性剪应力、渗流雷诺数、渗流耗能以及等效渗透系数的量级。研究表明，采用两相流理论精细求解米级尺度的裂隙岩体内的非线性渗流过程是可行的。

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	张燕1
	周轩1
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	叶剑红2

关键词 ：岩石力学, 两相流, 裂隙网络, 大开度裂隙, 非线性渗流, N-S方程, OpenFoam

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

引用本文:

张燕1，周轩1，2，叶剑红2. 大开度裂隙网络内非线性两相渗流的数值研究[J]. 岩石力学与工程学报, 2018, 37(4): 931-939.
ZHANG Yan1，ZHOU Xuan1，2，YE Jianhong2. Numerical analysis of nonlinear two-phase flow within large opening fracture networks in rockmass. , 2018, 37(4): 931-939.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.0771 或 http://www.rockmech.org/CN/Y2018/V37/I4/931

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