Study on early warning of rapid sinking of large land caisson in silt layer

Large caisson constructed in the soft soil layer is prone to rapid sinking during the sinking process. Rapid sinking is often accompanied by partial sinking, which affects construction safety and subsequent construction. There is no relevant early warning mechanism for early warning of rapid sinking...

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Main Authors: zhangru Shi, Xiaoteng Liang, Zuhao He, Min Qiu
Format: Article
Language:English
Published: EDP Sciences 2021-01-01
Series:E3S Web of Conferences
Online Access:https://www.e3s-conferences.org/articles/e3sconf/pdf/2021/59/e3sconf_iccaue2021_01036.pdf
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spelling doaj-adddb7e9c4df4025b973b2ad970c7c8e2021-07-08T07:08:04ZengEDP SciencesE3S Web of Conferences2267-12422021-01-012830103610.1051/e3sconf/202128301036e3sconf_iccaue2021_01036Study on early warning of rapid sinking of large land caisson in silt layerzhangru ShiXiaoteng Liang0Zuhao He1Min Qiu2CCCC Second Harbour Engineering Co. LtdCCCC Second Harbour Engineering Co. LtdCCCC Second Harbour Engineering Co. LtdLarge caisson constructed in the soft soil layer is prone to rapid sinking during the sinking process. Rapid sinking is often accompanied by partial sinking, which affects construction safety and subsequent construction. There is no relevant early warning mechanism for early warning of rapid sinking. This paper takes the sinking construction of a large land caisson in a deep silt layer as an example, analysis the rapid sinking mechanism through the earth pressure and settlement rate of the sinking process, and proposes a rapid sinking early warning mechanism. Before the rapid sinking, the soil at the edge of the blade feet is partially plastic damaged, and the earth pressure decreases continuously after reaching its limit value; The strain softening of the overlying soft soil layer, the rapid reduction of side friction and the instability of open caisson caused by soil gushing after the plastic zone connecting are the important reasons for the rapid sinking. The rapid sinking process is divided into “sagging section, starting section, instability section and stable section”. The earth pressure early warning mechanism is the continuous decrease of the earth pressure at the blade feet. When the sinking rate exceeds the threshold value for two hours, it is regarded as the early warning mechanism of sinking rate. Using this dual control mechanism of end earth pressure and sinking rate can effectively warn the rapid sinking of the caisson.https://www.e3s-conferences.org/articles/e3sconf/pdf/2021/59/e3sconf_iccaue2021_01036.pdf
collection DOAJ
language English
format Article
sources DOAJ
author zhangru Shi
Xiaoteng Liang
Zuhao He
Min Qiu
spellingShingle zhangru Shi
Xiaoteng Liang
Zuhao He
Min Qiu
Study on early warning of rapid sinking of large land caisson in silt layer
E3S Web of Conferences
author_facet zhangru Shi
Xiaoteng Liang
Zuhao He
Min Qiu
author_sort zhangru Shi
title Study on early warning of rapid sinking of large land caisson in silt layer
title_short Study on early warning of rapid sinking of large land caisson in silt layer
title_full Study on early warning of rapid sinking of large land caisson in silt layer
title_fullStr Study on early warning of rapid sinking of large land caisson in silt layer
title_full_unstemmed Study on early warning of rapid sinking of large land caisson in silt layer
title_sort study on early warning of rapid sinking of large land caisson in silt layer
publisher EDP Sciences
series E3S Web of Conferences
issn 2267-1242
publishDate 2021-01-01
description Large caisson constructed in the soft soil layer is prone to rapid sinking during the sinking process. Rapid sinking is often accompanied by partial sinking, which affects construction safety and subsequent construction. There is no relevant early warning mechanism for early warning of rapid sinking. This paper takes the sinking construction of a large land caisson in a deep silt layer as an example, analysis the rapid sinking mechanism through the earth pressure and settlement rate of the sinking process, and proposes a rapid sinking early warning mechanism. Before the rapid sinking, the soil at the edge of the blade feet is partially plastic damaged, and the earth pressure decreases continuously after reaching its limit value; The strain softening of the overlying soft soil layer, the rapid reduction of side friction and the instability of open caisson caused by soil gushing after the plastic zone connecting are the important reasons for the rapid sinking. The rapid sinking process is divided into “sagging section, starting section, instability section and stable section”. The earth pressure early warning mechanism is the continuous decrease of the earth pressure at the blade feet. When the sinking rate exceeds the threshold value for two hours, it is regarded as the early warning mechanism of sinking rate. Using this dual control mechanism of end earth pressure and sinking rate can effectively warn the rapid sinking of the caisson.
url https://www.e3s-conferences.org/articles/e3sconf/pdf/2021/59/e3sconf_iccaue2021_01036.pdf
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AT xiaotengliang studyonearlywarningofrapidsinkingoflargelandcaissoninsiltlayer
AT zuhaohe studyonearlywarningofrapidsinkingoflargelandcaissoninsiltlayer
AT minqiu studyonearlywarningofrapidsinkingoflargelandcaissoninsiltlayer
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