摘要
上覆硬壳层软土地基沉桩过程产生的挤土效应造成工程事故频发,基于此对上覆硬壳层软土地基预制桩挤土效应展开分析。采用有限元CEL方法对上覆硬壳层软土地基沉桩的全过程进行模拟,得到沉桩完成后桩周土体应力场和位移场分布,分析了硬壳层厚度对应力场和位移场的影响。结果表明:在软硬土层交界处,桩周土体的应力和位移会突然增加,是工程病害发生的主要区域;桩周土体的水平位移在硬壳层下方约1 m处达到最大值,竖向位移在软硬土层交界处达到最大值;随着硬壳层厚度逐渐增加,软硬土层交界处桩周土体应力和位移的突变值会逐渐增大,地表扰动范围逐渐增加。
The soil squeezing effect of pile driving in soft soil foundation covered with hard shell layer leads to frequent engineering accidents.Aim at analyzing the soil squeezing effect caused by the construction of precast piles,the CEL method is used to simulate the precast pile driving process in soft soil foundation covered with hard crust.The stress field and displacement field of the soil around the pile after the construction are investigated,and the influence of the thickness of hard shell on the stress field and displacement field is analyzed.The results show that the stress and displacement of the soil around the pile will suddenly increase at the junction of soft and hard soil layers,which is the area where the engineering disease commonly occurs.The horizontal displacement of soil around the pile reaches the maximum at about 1 m below the hard shell layer,and the vertical displacement reaches the maximum at the junction of hard and soft soil layers.With the increase of the thickness of the hard crust,the maximum of soil stress and displacement around the pile at the junction of hard and soft soil will gradually increase,as well as the range of the surface disturbance.
作者
郑昆鹏
边晓亚
魏想
ZHENG Kun-peng;BIAN Xiao-ya;WEI Xiang(School of Civil Engineering and Architecture,Wuhan Institute of Technology,Wuhan 430074,China)
出处
《南阳理工学院学报》
2023年第2期79-83,共5页
Journal of Nanyang Institute of Technology
基金
国家自然科学基金资助项目(52078396)
武汉工程大学第十三届研究生创新基金资助项目(CX2021132,CX2021130)。
关键词
硬壳层
预制桩
CEL方法
挤土效应
土体位移
hard crust
precast pile
CEL method
squeezing effect
soil displacement
