岩体软弱夹层渗透变形试验及三维有限元数值模拟

Seepage deformation field test and three-dimensional finite element numerical modeling on weak intercalation in rock mass

渗透变形或渗透破坏是由潜蚀强烈发展而出现的一种特有的不良地质作用,本文结合某大型水电工程坝基存在的软弱夹层,在现场取样试验,研究了这些软弱夹层在渗透水流作用下发生渗透变形的方式和程度,并以试验成果为基础,根据水工建筑物的布置以及上下游水头差等条件,采用数值模拟的方法模拟软弱夹层的水力梯度分布情况以及软弱夹层与上下两盘基岩中的水力梯度分布,为坝基防渗设计提供依据。

Seepage deformation or seepage failure is a special bad geological processes formed in result of the intense development of suffusion. The paper combine the weak intercalation existed in the dam foundation of a large scale hydroelectric project, and study on the mode and degree of seepage deformation of this weak intercalation by field sampling test. Based on the result of field test and the arrangement of the hydraulic structure and the head difference between the up reaches and the lower reaches, the paper simulate the hydraulic gradient distribution in week intercalation and in super and base rock mass of the weak intercalation adopted the method of three-dimensional finite element numerical modeling. The result of test and calculation is provided as the base of seepage control design of dam foundation.