四川大学学报：工程科学版2012，Vol.44Issue(4)：51-56,6.
考虑裂隙-岩块间水交换的单裂隙非饱和渗流数值模拟
Numerical Simulation of Unsaturated Flow in Single Fracture Considering the Water Exchange Between Fracture and Matrix
摘要
Abstract
In order to study the hydraulic characteristics of unsaturated flow in single fracture, a method for generating the distribution of fracture aperture using Weierstrass-Mandelbrot function was proposed according to fractal dimension,dislocation value and contact area of fracture surface. Based on the assumption that a parallel-plate approximation can stand in the subregion of the fracture ,a numerical model for simulating unsaturated flow in single fracture considering the quasi-static water exchange between fracture and matrix was built up. The simulated relationships between capillary pressure and saturation and between unsaturated hydraulic conductivity and capillary pressure of fracture could be used to describe the hysteresis during drainage and imbibition and figure out the air-entry value and the residual water saturation during drainage. The qualitative comparison of simulated results and experimental results Showed that the proposed model is fea- sible and reliable in modeling the unsaturated flow in single fracture considering the water exchange between fracture and matrix. Finally, comparisons of relation curve between unsaturated hydraulic conductivity and capillary pressure by taking water exchange into account or not was conducted. The result showed that the fracture-matrix exchange is negligible under high capillary pressure （low saturation）.关键词
水交换/单裂隙/非饱和渗流/数值模拟Key words
water exchange/single fracture/unsaturated flow/numerical simulation分类
水利科学引用本文复制引用
钟振,胡云进,刘国华..考虑裂隙-岩块间水交换的单裂隙非饱和渗流数值模拟[J].四川大学学报：工程科学版,2012,44(4):51-56,6.基金项目
国家自然科学基金资助项目 （）
水体污染控制与治理科技重大专项资助项目 （）
