摘要
为了解装配式可回收支护结构在粉土地区基坑开挖过程中的变形特征,以郑州市牛口峪引黄工程干线管道工程工作井基坑为背景,运用ABAQUS有限元软件分别建立了粉土环境下摩尔库伦土体和修正剑桥土体的装配式可回收支护结构基坑模型。通过比较分析模型的差异并结合模拟数据与理论计算以及实测数据的对比,对该类型结构支护效果作了定量的描述。结果表明:研究开发的采用修正剑桥土体的装配式可回收支护结构模型能较为真实地反映结构受力及变形特性,桩体水平位移最大值仅为3 mm,较传统支护水平位移更小;基坑基底最大隆起量仅为12 mm。可见装配式可回收支护结构整体变形较小,结构稳定性较高,可以作为指导粉土地区同类型基坑工程施工的重要参考。
In order to understand the deformation characteristics of a new developed prefabricated recyclable support structure at different excavation stages in silt soils,three-dimensional numerical models were established by the ABAQUS finite-element platform.The model was of Mohr-Coulomb(MC)and modified Cam-clay(MCC)silt soil models used in the stabilization of a rectangular foundation pit in Zhengzhou,Henan Province.The stability of the new support structure was described quantitatively by analyzing the difference of numerical models and comparing the simulated data with the theorical calculation and measured data.The results show that the MCC model of the prefabricated recyclable support structure enables to accurately reflect the mechanical and deformation characteristics.The maximum horizontal displacement of the prefabricated recyclable support structure is 3 mm,which is smaller than that of traditional support structure.The maximum bulge of the foundation pit is only 12 mm.The results also indicate that the prefabricated recyclable support structure has a good stability,which can be used in the foundation pits located in silty areas.
作者
王锐松
郭成超
曹鼎峰
叶钧陶
叶思聪
WANG Rui-song;GUO Cheng-chao;CAO Ding-feng;YE Jun-tao;YE Si-cong(School of Civil Engineering,Sun Yat-sen University,Guangzhou 510275,China;Guangdong Underground Space Development Engineering and Technology Research Center,Guangzhou 510275,China;Guangdong Key Laboratory of Marine Civil Engineering,Guangzhou 510275,China)
出处
《科学技术与工程》
北大核心
2021年第5期2011-2018,共8页
Science Technology and Engineering
基金
河南省重大科技专项(181100310400)
软弱土与环境土工教育部重点实验室(浙江大学)开放基金(2019P05)
岩土力学教育部重点实验室(河海大学)开放基金(2019011)
西藏自治区重点研发与转化计划(XZ201801-GB-07)。
关键词
装配式可回收支护结构
有限元数值模拟
理论计算
经验数据对比分析
基坑回弹
prefabricated recyclable support structure
finite-element numerical simulation
theoretical calculation
comparative analysis of empirical data
bulge of foundation pit
