土石围堰中混凝土防渗墙设计方案的数值优化

doi:10.13278/j.cnki.jjuese.20190095

Abstract

Abstract: It is necessary to select an optimal scheme of cutoff wall for earth-rock cofferdams, because the structure of the cutoff wall in the earth-rock cofferdam has an important influence on the seepage flow and the stability of cofferdam. In this paper, the optimal design of the thickness and depth of cutoff wall is studied by finite element method (FEM) taking as an example of a certain earth-rock cofferdam for construction, which is located in the Pearl River basin. The seepage fields based on 33 types of cutoff wall scheme which is composed of no concrete cutoff wall and 32 types of concrete cutoff wall about its thickness and its embedded depth within the weakly weathered rock were simulated. Then the control index, such as the seepage per unit width of cofferdam, the water head behind the cutoff wall, the hydraulic gradient at the bottom of cutoff wall and the cofferdam foot, were calculated and compared with the allowable value. Finally, the optimized anti-seepage scheme of cutoff wall was obtained. The conclusions made are as follows:1) Comparing with the thickness of cutoff wall, increasing the embedded depth within the rock can control more effectively the seepage per unit width of cofferdam and the height of the water head behind cutoff wall. 2) The change of hydraulic gradient at the bottom of cutoff wall is related to the depth of cutoff wall within the weakly weathered rock. Increasing the depth of cutoff wall from 0 to 8 m, the hydraulic gradient will decrease and will change from fast to slow. When the depth increases from 8 to 12 m, the hydraulic gradient will increase with the embedded depth and there is a significant increase after 10 m. 3) The cutoff wall with 0.8 m in thickness and 2 m in embedded depth within weakly weathered rock is regarded as the optimal anti-seepage scheme for this project after considering the project input and construction convenience. The results not only provide a basis for the design of the earth-rock cofferdam, but also provide a reference for the anti-seepage system of proposed earth-rock cofferdam projects under the same geological conditions.

Key words: earth-rock cofferdam, concrete cutoff wall, optimal design, hydraulic gradient, seepage flow

CLC Number:

TV223.4

Wang Changming, Lu Yun, Ma Donghe. Numerical Optimization of Design Schemes for ConcreteCutoff Wall in Earth-Rock Cofferdam[J].Journal of Jilin University(Earth Science Edition), 2020, 50(3): 857-865.

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Numerical Optimization of Design Schemes for ConcreteCutoff Wall in Earth-Rock Cofferdam

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