摘要
为研究裂隙内部接触面对其过流能力的影响,设计具有相同接触率、不同接触面分布方式的2组平行板裂隙以及1组具有天然特征的人工裂隙,分别进行渗流试验和剪切–渗流试验,并对试验过程进行有限元数值模拟。数值模拟结果与试验结果的对比表明,相对于一维的立方定律和二维的Reynolds方程,基于三维的Navier-Stokes方程的数值方法更能精确模拟出裂隙内过流的实际状态。裂隙的过流能力不仅受接触率和接触面分布方式影响,还受雷诺数的影响。雷诺数较大时,随着雷诺数的增大,裂隙的水力传导系数降低;同时,接触面的附近区域还会观察到回流,这被认为是导致裂隙水力传导系数降低的重要因素之一。
In order to investigate the behaviors of fluid flow through rock fractures,two kinds of artificial parallel plate fractures with different patterns of contact area distribution and one artificial rock fracture with natural fracture characteristics are designed.Flow tests on parallel plate fractures and coupled shear-flow test on artificial rock fracture as well as the related numerical simulations based on finite element method are carried out to investigate the local characteristics of flow through fractures.The results show that,despite of contact area ratio,which is the main reason,pattern of contact area distribution also affects the discharge capacity of fracture.Reynolds number plays an important role in the discharge capacity of fracture.With the increase in Reynolds number,backflow occurs around the contact area,which can decrease the discharge capacity of fracture to a certain extent.Results of numerical simulation are in good agreement with experimental tests.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2010年第11期2230-2238,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
2008年度教育部"长江学者和创新团队发展计划"资助项目(IRT0843)
2008年度教育部"长江学者和创新团队发展计划"资助项目(IRT0843)
