摘要
Forchheimer公式已广泛应用于高速非达西渗流计算中,但裂隙开度与粗糙度对公式中的特征参数k和β的影响研究尚不够明确。为此,应用Fluent计算软件,用标准J_(JRC)曲线模拟裂隙结构表面粗糙度,研究了裂隙开度b与裂隙粗糙度(J_(JRC))对渗透率k和非达西系数β的影响。结果表明,粗糙裂隙中发生高速渗流时,渗透率与J_(JRC)呈负相关关系,与裂隙开度呈正相关线性关系,裂隙开度是影响渗透率的主要因素;β随着J_(JRC)的增大而增大,随着裂隙开度的增大而减小;非达西系数与渗透率之间存在着负相关关系,这种关系可用幂函数来较好表达。
The Forchheimer formula has been widely used in the high velocity non-Darcy flow calculation,but the study of the influence of fracture opening and roughness on characteristic parameters k andβin the formula is not clear.In this paper,the surface roughness of fracture was simulated by standard J_（JRC）curve.The influence of fracture opening b and joint roughness coefficient（J_（JRC））on permeability k and non-Darcy coefficientβwas studied based on the Fluent calculation software.The results show that k is negatively correlated with J_（JRC）in the occurrence of high speed seepage in rough fractures,and k has a positive correlation with the fracture opening.Fracture opening b is the main factor for affecting k.βincreases with the increase of J_（JRC）,and decreases with the increase of fracture opening.There is a negative correlation betweenβand k,which can be expressed by apower function.
作者
于可
王媛
牛玉龙
YU Ke1,2, WANG Yuan1,2, NIU Yu-long1,2(1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering;2. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, Chin)
出处
《水电能源科学》
北大核心
2018年第5期98-101,136,共5页
Water Resources and Power
基金
国家重点研发计划(2016YFC0401804)
