Permeability Study on Geomembranes in Cofferdam Structure Based on the Fluid-Solid Coupling Mechanism

 

Xiaoyang Rong

Ph.D. Student College of Resources and Civil Engineering, Northeastern University
e-mail: xiaoyang121_121@126.com

Mudan Guo

Ph.D. Student College of Resources and Civil Engineering, Northeastern University
e-mail: kaixinxiaobaobao@126.com

 

 ABSTRACT

On the basis of the seepage and stress field coupling theory, a coupled fluid-solid mathematical model is established using the finite difference software FLAC3D to evaluate the performance of the earth-rock cofferdam of Changxin Island. Taking advantages of the low permeability of geomembrane, the cofferdam structure under the most unfavorable water level is simulated to investigate the pore water pressure changes, saturation, seepage vector, seepage velocity, saturation line, stress and displacement. The results show that the seepage discharge of the cofferdam structure with the implementation of geomembrane reduces by 94.5% from 4.33/10-4 m3/s to 2.37/10-5 m3/s. The saturation region, pore pressure, stress and displacement within the cofferdam reduces correspondingly. The numerical simulation is helpful for understanding the fluid-solid coupling mechanism and performing the corresponding anti-seepage design and control measures.

Keywords: Earth-rock cofferdam; fluid-solid coupling; numerical simulation; anti-seepage; geomembrane.

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