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Centrifugal Modeling Test on Deformation and Failure Behavior of Widening Embankment on Soft Soil with Pile Foundation(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2021年06期
Page:
11-17
Research Field:
软土地基加固与基础工程
Publishing date:

Info

Title:
Centrifugal Modeling Test on Deformation and Failure Behavior of Widening Embankment on Soft Soil with Pile Foundation
Author(s):
CHEN Da-zhang1;  CHEN Tian-yi2;  MOU Tai-ping1;  ZHANG Ga2
(1. Guangdong Provincial Freeway Co.,Ltd., Guangzhou 510623, Guangdong, China; 2. School of Civil Engineering, Tsinghua University, Beijing 100084, China)
Keywords:
soft soil;  embankment widening;  pile foundation;  deformation;  failure;  centrifugal modeling test
PACS:
TU433
DOI:
10.19815/j.jace.2021.08057
Abstract:
The centrifugal modeling test method was used to establish the model based on the reconstruction and expansion project of Guangzhou expressway, and the modeling test scheme of corresponding size was designed to simulate the widening process of new embankment on soft soil pile foundation. The deformation and failure law and mechanism of soft soil pile foundation were studied. The results show that the old embankment mainly has vertical displacement, while the new embankment has settlement and a certain amount of horizontal displacement. The slope shoulder area of the new embankment tends to slide towards the slope toe, which leads to sliding failure in the embankment and soft foundation during the construction of the new embankment. The slip surface in the new embankment appears first, and gradually forms from top to bottom from the slope shoulder of the new embankment to the top of the short pile. During the formation of the sliding surface of the new embankment, the sliding surface in the soft foundation is gradually formed from the foundation surface under the old embankment to the foundation at the foot of the new embankment slope. The two slip surfaces almost reach the through state at the same time. The pipe pile tilts to a certain extent, and the inclination angle increases rapidly at a certain time before the slip surface appears. Near the local slip surface, the displacement increases rapidly and the deformation is concentrated. Deformation localization leads to local failure, and local failure promotes the further development of deformation localization. The coupling development of the two eventually leads to the failure of soil.

References:

[1] 张丰焰,周 伟,王元庆,等.高速公路改扩建工程交通组织设计探讨[J].公路,2006(1):109-113.
ZHANG Feng-yan,ZHOU Wei,WANG Yuan-qing,et al.Discussion About Traffic Operation Design for Reconstruction and Expansion Engineering of Expressways[J].Highway,2006(1):109-113.
[2]高 翔.高速公路新老路基相互作用分析与处理技术研究[D].南京:东南大学,2006.
GAO Xiang.Research on the Interaction Between New and Existing Embankments and Treatment Techniques in Highway Widening Engineering[D].Nanjing:Southeast University,2006.
[3]翁效林.高速公路拓宽路基差异沉降控制技术研究[D].西安:长安大学,2009.
WENG Xiao-lin.Study on Differential Settlement Control Technology of Expressway Widening Subgrade[D].Xi'an:Chang'an University,2009.
[4]MU T P,CHEN T Y,QIU Z X.Centrifugal Modeling of Geo-synthetics Reinforced Roadbed Under Cyclic Loading Condition[J].Journal of Physics:Conference Series,2021,1904(1):012023.
[5]ZHANG Z,YE G B,XU Y.Comparative Analysis on Performance of Vertical Drain Improved Clay Deposit Under Vacuum or Surcharge Loading[J].Geotextiles and Geomembranes,2018,46(2):146-154.
[6]孙立强,闫澍旺,徐 余.软土路基“波浪型”不均匀沉降及其机制分析[J].岩土力学,2011,32(增1):526-531.
SUN Li-qiang,YAN Shu-wang,XU Yu.Study of Wave Type Asymmetry Settlement and Its Mechanism of Soft Soil Roadbed[J].Rock and Soil Mechanics,2011,32(S1):526-531.
[7]卢 谅,石通辉,杨 东.置换减载与加筋复合处理方法对路基不均匀沉降控制效果研究[J].岩土力学,2019,40(9):3474-3482.
LU Liang,SHI Tong-hui,YANG Dong.Control Effe-ct of Uneven Settlement of Subgrade by Composited Method of Replacement Load Shedding and Reinforced Embankment[J].Rock and Soil Mechanics,2019,40(9):3474-3482.
[8]高自理.地基不均匀沉降对上部框架结构的影响分析[D].武汉:武汉理工大学,2008.
GAO Zi-li.Analysis of the Impact of Subgrade Differential Settlement to Above Ground Part of the Frame Structure[D].Wuhan:Wuhan University of Technology,2008.
[9]VISWANADHAM B V S,KONIG D.Centrifuge Modeling of Geotextile-reinforced Slopes Subjected to Differential Settlements[J].Geotextiles and Geomembranes,2008,27(2):77-88.
[10]CHEN T Y,LUO F Y,ZHANG G,et al.Study on Deformation and Failure of Slopes Under Coupled Application of Water Level Change and Vertical Load[J].Bulletin of Engineering Geology and the Environment,2020,80(1):353-364.
[11]RAJESH S,VISWANADHAM B V S.Numerical Simulation of Geogrid-reinforced Soil Barriers Subjected to Differential Settlements[J].International Journal of Geomechanics,2015,15(4):4014062.
[12]POOROOSHASB H B.Subsidence Evaluation of Geotextile-reinforced Gravel Mats Bridging a Sinkhole[J].Geosynthetics International,2002,9(3):259-282.
[13]TAN J,CUI Z D,YUAN L.Study on the Long-term Settlement of Subway Tunnel in Soft Soil Area[J].Marie Georesources and Geotechnology,2016,34(5):486-492.
[14]CHEN Y J,ZHANG J,ZHOU A C,et al.Modeling and Analysis of Mining Subsidence Disaster Chains Based on Stochastic Petri Nets[J].Natural Hazards,2018,92:19-41.
[15]DIVYA P V,VISWANADHAM B V S,GOURC J P.Centrifuge Model Study on the Performance of Fiber Reinforced Clay-based Landfill Covers Subjected to Flexural Distress[J].Applied Clay Science,2017,142:173-184.
[16]BALAKRISHNAN S,VISWANADHAM B V S.Performance Evaluation of Geogrid Reinforced Soil Walls with Marginal Backfills Through Centrifuge Model Tests[J].Geotextiles and Geomembranes,2016,44(1):95-108.
[17]ANTONAKI N,ABDOUN T,SASANAKUL I.Consolidation and Dynamic Response of a Layered Mine Tailings Deposit in Centrifuge Tests[J].Geotechnical Testing Journal,2017,40(5):20160143.
[18]DIVYA P V,VISWANADHAM B V S,GOURC J P.Centrifuge Model Study on the Performance of Fiber Reinforced Clay-based Landfill Covers Subjected to Flexural Distress[J].Applied Clay Science,2017,142:173-184.
[19]王 海.土工离心模型试验技术若干关键问题研究[D].哈尔滨:中国地震局工程力学研究所,2019.
WANG Hai.Research on Several Crucial Problems of Geotechnical Centrifuge Modeling Techniques[D].Harbin:Institute of Engineering Mechanics,China Earthquake Administration,2019.
[20]ZHANG G,HU Y,ZHANG J.New Image Analysis-Based Displacement-measurement System for Geote-chnical Centrifuge Modeling Tests[J].Measurement,2009,42(1):87-96.
[21]WANG L,ZHANG G,ZHANG J.Nail Reinforcement Mechanism of Cohesive Soil Slopes Under Earthquake Conditions[J].Soils and Foundations,2010,50(4):459-469.

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Last Update: 2021-11-01