Field test and numerical simulation of deformation characteristics of embankment on soft ground under different filling speeds

KONG Gang-qiang; ZHANG Chi

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Field test and numerical simulation of deformation characteristics of embankment on soft ground under different filling speeds

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- Field test and numerical simulation of deformation characteristics of embankment on soft ground under different filling speeds
- Vol. 35, Issue S2, (2014)
- 作者机构：
  
  1. 河海大学岩土力学与堤坝工程教育部重点试验室,南京,210098
  2. 河海大学土木与交通学院,南京,210098
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU470
- Online First：12 November 2014，
  
  Published：2014
- 稿件说明：
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KONG Gang-qiang, ZHANG Chi. Field test and numerical simulation of deformation characteristics of embankment on soft ground under different filling speeds[J]. 2014, 35(S2).
DOI：

KONG Gang-qiang, ZHANG Chi. Field test and numerical simulation of deformation characteristics of embankment on soft ground under different filling speeds[J]. 2014, 35(S2). DOI：

摘要

堤防的沉降和稳定问题是软土地基上新建堤防工程必须考虑的重要问题。结合南京市长江干堤提升工程小年圩新筑堤项目，开展了软土地基上新建堤防施工全过程的现场监测与分析，主要包括表层沉降、分层沉降、土体侧向位移、土压力、孔隙水压力以及地下水位等内容。基于Plaxis有限元数值软件，建立了软土地基上新建堤防施工填筑过程的数值模型，通过与现场监测结果的对比分析，验证了所建立的数值模型的准确性和可靠性；续而重点分析了填筑速率、填筑间歇时间等关键性施工控制指标对软基上堤防沉降的影响规律。研究结果表明，当单次填筑厚度小于1 m时，单次填筑厚度对整体沉降的影响较小，因此结合实际施工要求，建议单次填土厚度为0.5～1.0 m。相关研究成果可以为类似软基上新建堤防施工质量控制提供参考依据。

Abstract

When construction embankment upon soft ground

settlement and stability are most important problems to be considered. Based on Xiaonianwei construction on Nanjing Yangtze Dike upgrading project

field monitoring and tests on embankment construction process upon soft ground are carried out. The monitoring projects contain surface settlements

layered settlements

lateral displacements of soil

soil pressure

pore water pressure and the groundwater table

etc. Based on Plaxis software

numerical simulation model on embankment construction process upon soft ground is built. The accuracy and reliability of numerical simulation model is verified by comparative analysis with field monitoring results. Then

the settlement influenced by key indicators of construction control factors

such as filling rate and filling intermittent time

is discussed and analyzed. The results show that the whole settlement increases with single filling thickness increasing; while the influence becomes little when single filling thickness less than 1 m. Hence

the single filling thickness with 0.5－1.0 m is suggested. The research results can provide a reference to construction quality control upon soft ground in similar places.

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