摘要
基于三维节理网络模拟技术,应用渗流能量叠加原理,推导节理岩体渗透张量的理论计算公式,在此基础上提出裂隙岩体渗透表征单元体积的确定方法。该方法考虑空间节理的具体分布和连通情况,同时根据节理的开度变化和立方定理又可分析应力场对渗透张量的影响,可方便、有效地进行裂隙岩体渗透特性的分析。随后讨论节理迹长、间距、开度、产状和组数等结构面几何特征对岩体渗透特性及表征单元体积的影响。最后采用上述方法,以拉西瓦水电站右岸岩体为例,计算工程岩体的渗透张量,并分析渗透表征单元体积大小及地应力对其渗透特性的影响。研究结果在工程设计中具有应用价值。
Based on the technology of three-dimensional joint network simulation and superposition principle of seepage energyt,he calculation method is presented to determine the three-dimensional permeability tensor and the representative elementary volume（REV） size of fractured rock masses.The method is feasible and reasonable to calculate permeability tensor of fractured rock masses considering the distribution and connection of joint network and the influence of aperture changes（decided by stress fields） on permeability tensor according to cubic law.The factors influencing the permeability characteristic and REV size of rock masses such as trace length,space,aperture,inclination and the number of joint sets are discussed.As an example,the permeability tensor and REV size of fractured rock masses on the right bank of Laxiwa Hydropower Station are studied.At the same time,the stress-dependent permeability issue is investigated.The results is worth using in engineering design.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2007年第4期740-746,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金重点项目(50239070)
关键词
岩石力学
节理网络模拟
渗透张量
表征单元体积
rock mechanicsj
oint network simulation
permeability tensorr
epresentative elementary volume（REV）
