岩体粗糙裂隙渗流研究

Research on Seepage in Coarse Fractures of Rock Mass

渗流线性立方定律是建立在单直平滑裂隙基础上的,而工程中裂隙多是粗糙的,很多裂隙渗流不满足线性立方定律。针对这一问题,根据裂隙分布统计特征生成粗糙裂隙,推导了不同渗流本构关系下的单宽流量公式、裂隙等分段结点水头公式和等效隙宽公式。对比分析光滑、粗糙裂隙的渗流规律得出如下结论:①实际工程中的裂隙往往是不平滑的,统计裂隙开度分布规律、研究裂隙开度的模拟是非常有必要的;②粗糙裂隙非立方、非线性型渗流的基本规律与光滑平直裂隙非立方、非线性型渗流的基本规律存在明显不同;③相等平均隙宽条件下的粗糙裂隙比光滑裂隙的过流能力小得多。

Linear Cubic-Law for seepage is derived in single straight smooth fracture,where as most fractures in engineering rock mass are coarse,the seepage in them doesn＇t abide by linear Cubic-Law.The coarse fractures are simulated according to the aperture distribution statistical regularity,and the unit discharge formula and the water head formula for length-equaling node and the hydraulic power equaling aperture of different seepage configuration has been derived.And the following conclusions for seepage can be drawn by contrasting the seepage law in smooth fractures and in coarse fractures： ①The fractures in practical engineering are most coarse,and it is very essential to get the statistical regularity for fractures aperture and to simulate the fractures according to statistical regularity for fractures aperture;②There exist obvious differences in the seepage law of Non-cubic seepage and nonlinear seepage in smooth fractures and in coarse fractures;③ The fluid passing ability for coarse fractures is smaller than the smooth fractures on the same conditions.