Analysis of Non-Darcy Flow in Aquitard at Bottom of Foundation Pit Under Fluctuation of Confined Water

In order to better explain the phenomenon of foundation pit inrush caused by confined water, the Hansbo non-Darcy seepage theory was introduced into the Terzaghi one-dimensional saturated soil consolidation equation. Finite difference methods were applied to the numerical solution of excess pore pre...

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Autores principales:	YING Hongwei, XU Dingye, WANG Di, ZHANG Lisha
Formato:	article
Lenguaje:	ZH
Publicado:	Editorial Office of Journal of Shanghai Jiao Tong University 2020
Materias:	non-darcy flow foundation pit excess pore pressure response aquitard exit gradient Engineering (General). Civil engineering (General) TA1-2040 Chemical engineering TP155-156 Naval architecture. Shipbuilding. Marine engineering VM1-989
Acceso en línea:	https://doaj.org/article/36188c87a6c74fae8687d0f49c38e623
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spelling	oai:doaj.org-article:36188c87a6c74fae8687d0f49c38e6232021-11-04T09:34:51ZAnalysis of Non-Darcy Flow in Aquitard at Bottom of Foundation Pit Under Fluctuation of Confined Water1006-246710.16183/j.cnki.jsjtu.2019.036https://doaj.org/article/36188c87a6c74fae8687d0f49c38e6232020-12-01T00:00:00Zhttp://xuebao.sjtu.edu.cn/CN/10.16183/j.cnki.jsjtu.2019.036https://doaj.org/toc/1006-2467In order to better explain the phenomenon of foundation pit inrush caused by confined water, the Hansbo non-Darcy seepage theory was introduced into the Terzaghi one-dimensional saturated soil consolidation equation. Finite difference methods were applied to the numerical solution of excess pore pressure caused by the fluctuation of confined water. Then, the numerical solution was reduced to Darcy seepage and compared with the analytical solution. The effects of non-Darcy parameters, fluctuation periods of confined water, and initial water levels on the variation of excess pore pressure in the aquitard were analyzed. The results show that the excess pore pressure in aquitard volatility increases over time under the fluctuation of confined water, and reaches a stable fluctuating state after several cycles. The greater the initial hydraulic gradient and test constant of non-Darcy, the more obvious the hysteresis phenomenon of excess pore pressure, and the smaller the amplitude. The longer period of pressure water fluctuation or the higher the initial water level, the greater the amplitude of excess pore pressure oscillation. In addition, when the base is subjected to higher levels of initial confined water, the excess pore pressure in aquitard becomes more susceptible to the change of confined water pressure. The application of a case indicates that the designed drawdown depth of the confined water level could be reduced if the non-Darcy factor is considered.YING HongweiXU DingyeWANG DiZHANG LishaEditorial Office of Journal of Shanghai Jiao Tong Universityarticlenon-darcy flowfoundation pitexcess pore pressure responseaquitardexit gradientEngineering (General). Civil engineering (General)TA1-2040Chemical engineeringTP155-156Naval architecture. Shipbuilding. Marine engineeringVM1-989ZHShanghai Jiaotong Daxue xuebao, Vol 54, Iss 12, Pp 1300-1306 (2020)
institution	DOAJ
collection	DOAJ
language	ZH
topic	non-darcy flow foundation pit excess pore pressure response aquitard exit gradient Engineering (General). Civil engineering (General) TA1-2040 Chemical engineering TP155-156 Naval architecture. Shipbuilding. Marine engineering VM1-989
spellingShingle	non-darcy flow foundation pit excess pore pressure response aquitard exit gradient Engineering (General). Civil engineering (General) TA1-2040 Chemical engineering TP155-156 Naval architecture. Shipbuilding. Marine engineering VM1-989 YING Hongwei XU Dingye WANG Di ZHANG Lisha Analysis of Non-Darcy Flow in Aquitard at Bottom of Foundation Pit Under Fluctuation of Confined Water
description	In order to better explain the phenomenon of foundation pit inrush caused by confined water, the Hansbo non-Darcy seepage theory was introduced into the Terzaghi one-dimensional saturated soil consolidation equation. Finite difference methods were applied to the numerical solution of excess pore pressure caused by the fluctuation of confined water. Then, the numerical solution was reduced to Darcy seepage and compared with the analytical solution. The effects of non-Darcy parameters, fluctuation periods of confined water, and initial water levels on the variation of excess pore pressure in the aquitard were analyzed. The results show that the excess pore pressure in aquitard volatility increases over time under the fluctuation of confined water, and reaches a stable fluctuating state after several cycles. The greater the initial hydraulic gradient and test constant of non-Darcy, the more obvious the hysteresis phenomenon of excess pore pressure, and the smaller the amplitude. The longer period of pressure water fluctuation or the higher the initial water level, the greater the amplitude of excess pore pressure oscillation. In addition, when the base is subjected to higher levels of initial confined water, the excess pore pressure in aquitard becomes more susceptible to the change of confined water pressure. The application of a case indicates that the designed drawdown depth of the confined water level could be reduced if the non-Darcy factor is considered.
format	article
author	YING Hongwei XU Dingye WANG Di ZHANG Lisha
author_facet	YING Hongwei XU Dingye WANG Di ZHANG Lisha
author_sort	YING Hongwei
title	Analysis of Non-Darcy Flow in Aquitard at Bottom of Foundation Pit Under Fluctuation of Confined Water
title_short	Analysis of Non-Darcy Flow in Aquitard at Bottom of Foundation Pit Under Fluctuation of Confined Water
title_full	Analysis of Non-Darcy Flow in Aquitard at Bottom of Foundation Pit Under Fluctuation of Confined Water
title_fullStr	Analysis of Non-Darcy Flow in Aquitard at Bottom of Foundation Pit Under Fluctuation of Confined Water
title_full_unstemmed	Analysis of Non-Darcy Flow in Aquitard at Bottom of Foundation Pit Under Fluctuation of Confined Water
title_sort	analysis of non-darcy flow in aquitard at bottom of foundation pit under fluctuation of confined water
publisher	Editorial Office of Journal of Shanghai Jiao Tong University
publishDate	2020
url	https://doaj.org/article/36188c87a6c74fae8687d0f49c38e623
work_keys_str_mv	AT yinghongwei analysisofnondarcyflowinaquitardatbottomoffoundationpitunderfluctuationofconfinedwater AT xudingye analysisofnondarcyflowinaquitardatbottomoffoundationpitunderfluctuationofconfinedwater AT wangdi analysisofnondarcyflowinaquitardatbottomoffoundationpitunderfluctuationofconfinedwater AT zhanglisha analysisofnondarcyflowinaquitardatbottomoffoundationpitunderfluctuationofconfinedwater
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Analysis of Non-Darcy Flow in Aquitard at Bottom of Foundation Pit Under Fluctuation of Confined Water

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