Centrifuge modelling on the stability of emergency flood control riverbank reinforced by deep mixed column: Case Study of Baishan Junction, China

Deep mixed column (CDM) are often used to improve the stability of embankments/riverbanks in soft soil areas due to the extremely low bearing capacity of natural soft soil foundations. Especially for riverbank filling for emergency flood control. In order to accurately identify the destabilization a...

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Main Authors: Chen Shen, Dingwen Zhang, Johan Clausen, Tao Song, Jingmin Xu, Songsong Yang
Format: Article
Language:English
Published: Elsevier 2023-12-01
Series:Case Studies in Construction Materials
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S2214509523007945
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author Chen Shen
Dingwen Zhang
Johan Clausen
Tao Song
Jingmin Xu
Songsong Yang
author_facet Chen Shen
Dingwen Zhang
Johan Clausen
Tao Song
Jingmin Xu
Songsong Yang
author_sort Chen Shen
collection DOAJ
description Deep mixed column (CDM) are often used to improve the stability of embankments/riverbanks in soft soil areas due to the extremely low bearing capacity of natural soft soil foundations. Especially for riverbank filling for emergency flood control. In order to accurately identify the destabilization and damage characteristics of the riverbank reinforced by CDMs, centrifugal model test was conducted to investigate the settlement characteristic of the riverbank, the force and deformation properties of the piles at different locations, as well as the destabilization and damage mechanisms of the foundation under the high gravity field. The riverbank has two slopes, a primary slope and a secondary slope in that order from the top of the riverbank downward. The results indicate that the soil below the top of the primary slope was subjected to compression, and no large horizontal displacement occurred in this region. In addition, ground collapse has occurred near the toe of the riverbank slope. Besides the most dangerous sliding surface, there are still potential sliding bodies and sliding surfaces in the foundation. The soil slip surface and the points of failure in the columns were not completely coincident. After the column failure happened, it can be used as a fast drainage channel to accelerate soil consolidation. The piles under the top of the primary slope were mainly damaged in compression without large horizontal deformation; the piles under the shoulder of the primary slope to the shoulder of the secondary slope were damaged in bending failure and carried most of the horizontal loads; and the piles under the secondary slope to the riverbed were damaged in shear failure. According to the specific damage situation of the columns, rigid piles/strength core composite piles with higher bending strength can be considered to replace some of the CDMs to effectively improve current design methods for CDM-reinforced foundation.
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spelling doaj.art-ec9cdb4a85694cd788771a053b1757fe2023-11-25T04:49:29ZengElsevierCase Studies in Construction Materials2214-50952023-12-0119e02614Centrifuge modelling on the stability of emergency flood control riverbank reinforced by deep mixed column: Case Study of Baishan Junction, ChinaChen Shen0Dingwen Zhang1Johan Clausen2Tao Song3Jingmin Xu4Songsong Yang5Institute of Geotechnical Engineering, School of Transportation, Southeast University, Southeast University Road No. 2, Nanjing, Jiangsu 211189, China; Key Laboratory of Transport Industry of Comprehensive Transportation Theory ( Nanjing Modern Multimodal Transportation Laboratory), Ministry of Transport, PRC, Nanjing, 211100; Department of Civil and Architectural Engineering, Aarhus University, Inge Lehmanns Gade 10, 8000 Aarhus, DenmarkInstitute of Geotechnical Engineering, School of Transportation, Southeast University, Southeast University Road No. 2, Nanjing, Jiangsu 211189, China; Key Laboratory of Transport Industry of Comprehensive Transportation Theory ( Nanjing Modern Multimodal Transportation Laboratory), Ministry of Transport, PRC, Nanjing, 211100; Corresponding author at: Institute of Geotechnical Engineering, School of Transportation, Southeast University, Southeast University Road No. 2, Nanjing, Jiangsu 211189, China.Department of Civil and Architectural Engineering, Aarhus University, Inge Lehmanns Gade 10, 8000 Aarhus, DenmarkAnhui Survey & Design Institute of Water Resources & Hydropower Co., Ltd., Heifei 230088, Anhui, ChinaInstitute of Geotechnical Engineering, School of Transportation, Southeast University, Southeast University Road No. 2, Nanjing, Jiangsu 211189, ChinaInstitute of Geotechnical Engineering, School of Transportation, Southeast University, Southeast University Road No. 2, Nanjing, Jiangsu 211189, ChinaDeep mixed column (CDM) are often used to improve the stability of embankments/riverbanks in soft soil areas due to the extremely low bearing capacity of natural soft soil foundations. Especially for riverbank filling for emergency flood control. In order to accurately identify the destabilization and damage characteristics of the riverbank reinforced by CDMs, centrifugal model test was conducted to investigate the settlement characteristic of the riverbank, the force and deformation properties of the piles at different locations, as well as the destabilization and damage mechanisms of the foundation under the high gravity field. The riverbank has two slopes, a primary slope and a secondary slope in that order from the top of the riverbank downward. The results indicate that the soil below the top of the primary slope was subjected to compression, and no large horizontal displacement occurred in this region. In addition, ground collapse has occurred near the toe of the riverbank slope. Besides the most dangerous sliding surface, there are still potential sliding bodies and sliding surfaces in the foundation. The soil slip surface and the points of failure in the columns were not completely coincident. After the column failure happened, it can be used as a fast drainage channel to accelerate soil consolidation. The piles under the top of the primary slope were mainly damaged in compression without large horizontal deformation; the piles under the shoulder of the primary slope to the shoulder of the secondary slope were damaged in bending failure and carried most of the horizontal loads; and the piles under the secondary slope to the riverbed were damaged in shear failure. According to the specific damage situation of the columns, rigid piles/strength core composite piles with higher bending strength can be considered to replace some of the CDMs to effectively improve current design methods for CDM-reinforced foundation.http://www.sciencedirect.com/science/article/pii/S2214509523007945Deep mixed columnCentrifuge model testRiverbank stabilityGround improvementFailure modeSettlement
spellingShingle Chen Shen
Dingwen Zhang
Johan Clausen
Tao Song
Jingmin Xu
Songsong Yang
Centrifuge modelling on the stability of emergency flood control riverbank reinforced by deep mixed column: Case Study of Baishan Junction, China
Case Studies in Construction Materials
Deep mixed column
Centrifuge model test
Riverbank stability
Ground improvement
Failure mode
Settlement
title Centrifuge modelling on the stability of emergency flood control riverbank reinforced by deep mixed column: Case Study of Baishan Junction, China
title_full Centrifuge modelling on the stability of emergency flood control riverbank reinforced by deep mixed column: Case Study of Baishan Junction, China
title_fullStr Centrifuge modelling on the stability of emergency flood control riverbank reinforced by deep mixed column: Case Study of Baishan Junction, China
title_full_unstemmed Centrifuge modelling on the stability of emergency flood control riverbank reinforced by deep mixed column: Case Study of Baishan Junction, China
title_short Centrifuge modelling on the stability of emergency flood control riverbank reinforced by deep mixed column: Case Study of Baishan Junction, China
title_sort centrifuge modelling on the stability of emergency flood control riverbank reinforced by deep mixed column case study of baishan junction china
topic Deep mixed column
Centrifuge model test
Riverbank stability
Ground improvement
Failure mode
Settlement
url http://www.sciencedirect.com/science/article/pii/S2214509523007945
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