Numerical Analysis of Concrete Gravity Dam Seepage Characteristics Evolution considering the Calcium Leaching Effect

During the long-term service life of hydraulic structures, the calcium compounds in cement-based materials decompose in the aqueous environment, leading to the continuous change of seepage characteristics. To study the influence of calcium leaching on the concrete dam seepage characteristics, we pro...

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Autores principales:	Kailai Zhang, Liqun Xu, Liting Qiu, Jiacheng Tan, Chao Yang, Kai Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/426a6b9b8f9d41628b645d783afc81dd
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id	oai:doaj.org-article:426a6b9b8f9d41628b645d783afc81dd
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spelling	oai:doaj.org-article:426a6b9b8f9d41628b645d783afc81dd2021-11-29T00:55:50ZNumerical Analysis of Concrete Gravity Dam Seepage Characteristics Evolution considering the Calcium Leaching Effect1687-809410.1155/2021/9042863https://doaj.org/article/426a6b9b8f9d41628b645d783afc81dd2021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/9042863https://doaj.org/toc/1687-8094During the long-term service life of hydraulic structures, the calcium compounds in cement-based materials decompose in the aqueous environment, leading to the continuous change of seepage characteristics. To study the influence of calcium leaching on the concrete dam seepage characteristics, we proposed a new mathematic model of the cement-based material calcium leaching model under advection-diffusion-driven leaching. A solid-liquid nonequilibrium model is adopted to model the decomposition of calcium hydroxide (CH) and calcium silicate hydrate gel (C-S-H). To calculate the porosity more accurately, the proposed model takes the effect of different calcium compound decomposition on the porosity increase in consideration, respectively. Shimantan dam is selected for the three-dimensional (3D) calcium leaching analyses. The 3D finite element model of this dam is analyzed using COMSOL Multiphysics software that is based on the finite element method. Based on the proposed model, seepage characteristics evolutions of the Shimantan dam are studied. Good agreement between the numerical results and the monitored data indicates the accuracy of this simulation. The result shows that after 100 a leaching duration, the uplift pressure increases by 40.8%, and the leakage quantities of the dam body and foundation increase by 48 and 17 times. The rise of uplift pressure and leakage changes caused by curtain deterioration are the main influences of calcium leaching on the dam seepage. The parameter sensitivity results show that it is necessary to reduce CH content in cement-based materials to obtain better calcium leaching durability. This model and simulation results can guide the operation of concrete dams under advection-diffusion-driven leaching.Kailai ZhangLiqun XuLiting QiuJiacheng TanChao YangKai ZhangHindawi LimitedarticleEngineering (General). Civil engineering (General)TA1-2040ENAdvances in Civil Engineering, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Engineering (General). Civil engineering (General) TA1-2040 Kailai Zhang Liqun Xu Liting Qiu Jiacheng Tan Chao Yang Kai Zhang Numerical Analysis of Concrete Gravity Dam Seepage Characteristics Evolution considering the Calcium Leaching Effect
description	During the long-term service life of hydraulic structures, the calcium compounds in cement-based materials decompose in the aqueous environment, leading to the continuous change of seepage characteristics. To study the influence of calcium leaching on the concrete dam seepage characteristics, we proposed a new mathematic model of the cement-based material calcium leaching model under advection-diffusion-driven leaching. A solid-liquid nonequilibrium model is adopted to model the decomposition of calcium hydroxide (CH) and calcium silicate hydrate gel (C-S-H). To calculate the porosity more accurately, the proposed model takes the effect of different calcium compound decomposition on the porosity increase in consideration, respectively. Shimantan dam is selected for the three-dimensional (3D) calcium leaching analyses. The 3D finite element model of this dam is analyzed using COMSOL Multiphysics software that is based on the finite element method. Based on the proposed model, seepage characteristics evolutions of the Shimantan dam are studied. Good agreement between the numerical results and the monitored data indicates the accuracy of this simulation. The result shows that after 100 a leaching duration, the uplift pressure increases by 40.8%, and the leakage quantities of the dam body and foundation increase by 48 and 17 times. The rise of uplift pressure and leakage changes caused by curtain deterioration are the main influences of calcium leaching on the dam seepage. The parameter sensitivity results show that it is necessary to reduce CH content in cement-based materials to obtain better calcium leaching durability. This model and simulation results can guide the operation of concrete dams under advection-diffusion-driven leaching.
format	article
author	Kailai Zhang Liqun Xu Liting Qiu Jiacheng Tan Chao Yang Kai Zhang
author_facet	Kailai Zhang Liqun Xu Liting Qiu Jiacheng Tan Chao Yang Kai Zhang
author_sort	Kailai Zhang
title	Numerical Analysis of Concrete Gravity Dam Seepage Characteristics Evolution considering the Calcium Leaching Effect
title_short	Numerical Analysis of Concrete Gravity Dam Seepage Characteristics Evolution considering the Calcium Leaching Effect
title_full	Numerical Analysis of Concrete Gravity Dam Seepage Characteristics Evolution considering the Calcium Leaching Effect
title_fullStr	Numerical Analysis of Concrete Gravity Dam Seepage Characteristics Evolution considering the Calcium Leaching Effect
title_full_unstemmed	Numerical Analysis of Concrete Gravity Dam Seepage Characteristics Evolution considering the Calcium Leaching Effect
title_sort	numerical analysis of concrete gravity dam seepage characteristics evolution considering the calcium leaching effect
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/426a6b9b8f9d41628b645d783afc81dd
work_keys_str_mv	AT kailaizhang numericalanalysisofconcretegravitydamseepagecharacteristicsevolutionconsideringthecalciumleachingeffect AT liqunxu numericalanalysisofconcretegravitydamseepagecharacteristicsevolutionconsideringthecalciumleachingeffect AT litingqiu numericalanalysisofconcretegravitydamseepagecharacteristicsevolutionconsideringthecalciumleachingeffect AT jiachengtan numericalanalysisofconcretegravitydamseepagecharacteristicsevolutionconsideringthecalciumleachingeffect AT chaoyang numericalanalysisofconcretegravitydamseepagecharacteristicsevolutionconsideringthecalciumleachingeffect AT kaizhang numericalanalysisofconcretegravitydamseepagecharacteristicsevolutionconsideringthecalciumleachingeffect
_version_	1718407765189197824

Numerical Analysis of Concrete Gravity Dam Seepage Characteristics Evolution considering the Calcium Leaching Effect

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