岩体裂隙饱和/非饱和渗流机理初步研究

基于裂隙局部开度为平行板模型的假定,按一定分布抽样生成裂隙面上开度随机数,并分别对单裂隙饱和及非饱和渗流进行了数值模拟.裂隙饱和及非饱和渗流在渗流机理上都是由于水势差引起的,只不过在非饱和渗流情形下,湿润相水压力小于非湿润相空气的压力.饱和渗流时,水流主要集中在大开度,即“沟槽”中;而非饱和渗流时,水流运动多发生在小开度,即“狭缝”中.

A Study of Mechanism for Saturated Seepage Flow/Unsaturated Seepage Flow in a Rock Fracture

With the hypothes is of parallel plate model for local aperture regions,the apertures are generat ed by using the statistical methods according to a certain aperture distribution,and the numerical simulations are performed for saturated seepage flow and unsaturated seepage flow in the fracture.The mechanism of both saturated seepage flow and unsaturated seepage flow is the difference of water pressure potential.For the unsaturated seepage flow,the pressure of wetting phase(water) is less than the pressure of nonwetting phase(air) everywhere in the field.The water flow is mainly in the large apertures for saturated seepage flow.On the contrary,the water flow is mainly in the little a pertures for unsaturated seepage flow.