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鉴于节理粗糙度、力学隙宽及迹线是影响确定粗糙单裂隙等效水力隙宽的三个关键因素,在既有研究的基础上,将光滑平行板和Barton提出的10条标准节理粗糙度系数曲线数字化,应用Fluent软件对不同节理粗糙度系数和不同力学隙宽模型进行数值模拟,探讨了节理粗糙度系数、力学隙宽、迹线与等效水力隙宽之间的关系。并与立方定理修正公式进行对比,结果表明等效水力隙宽随力学隙宽增大而线性增大,随节理粗糙度系数的增大而减小,并且考虑实际迹线情况的等效水力隙宽较不考虑的大。因此,在实际工程中,可采用所提出的拟合公式判断自然粗糙裂隙的渗透能力。
Considering the joint roughness, mechanical gap width and the trace are the three key factors that affect the equivalent hydraulic gap width of the single rough crack, based on the existing research, the smooth parallel plate and Barton’s proposed 10 standard joint roughness Coefficient curves were digitized. The Fluent software was used to simulate the joint roughness coefficients and different mechanical gap models, and the relationship between the joint roughness coefficient, mechanical gap width and the equivalent hydraulic gap width was discussed. The results show that the equivalent hydraulic gap width increases linearly with the increase of the mechanical gap width and decreases with the increase of the joint roughness coefficient, and the equivalent hydraulic gap considering the actual trace condition Wider than not considered. Therefore, in practical engineering, the proposed fitting formula can be used to judge the permeability of natural rough fracture.