The Seepage Behavior of Composite Geo-Membrane & Cutoff Wall Applied in Three Gorges Project
The primary objective of this paper is to study the seepage behavior of the cutoff wall and the working mechanism of the composite geo-membrane applied in the second stage cofferdam of the Three Gorges Dam. The mixture proportion of the plastic concrete applied in the cutoff wall is researched and a recommended proportion is put forward. The difference between the composite geo-membrane and single geo-membrane concerning mechanical strength and permeability is detected and reasons which lead to the difference are found. The test results indicate that the mechanical characters of the composite geo-membrane have been improved remarkably. It is demonstrated that the deformation ratio plays an important role in terms of the permeability by bursting test. The behavior of the composite geo-membrane and the effect of the composite materials in different work-stage are studied and the influence of the elasticity of the composite materials on the practical application of the composite geo-membrane is analyzed. It is found that the strength is not just the superposition of the strength of composite materials and membrane.
Wenya Tian and Linli Xu
K. C. Sun, "The Seepage Behavior of Composite Geo-Membrane & Cutoff Wall Applied in Three Gorges Project", Advanced Materials Research, Vol. 186, pp. 146-150, 2011