摘要
利用大尺度模型试验系统,在黏性土中进行了静压沉桩室内模型试验,获得了黏性土中静压桩贯入特性的宏观现象。为了解决静压桩沉桩过程中桩身宏细观力学响应问题,利用二维颗粒流数值模拟软件,模拟了静压桩的连续贯入过程,在细观层面上研究了静压桩贯入过程中压桩力、桩端阻力和桩侧摩阻力的变化规律。结果表明:静压桩桩身受力特性与桩径密切相关,桩径越大,对土体的侧向挤压力越大,桩侧摩阻力发挥得越明显,压桩力也越大;随着入土深度增加,临近桩身位置处土体的水平接触力链增大,越靠近桩端处的水平力链越大,桩端处土体的接触力链密集区呈现圆形。
By using the large-scale model test system,the indoor model tests in the clay soil were carried out,and the macroscopic phenomena of the penetration characteristics of the static piles in the clay soil were obtained.In order to solve the problem of macro and meso mechanical response of the pile body during the pile driving process of the static pressure pile,the continuous penetration process of the static pressure pile was simulated by using two-dimensional particle flow numerical simulation software,and the variation law of the pile pressure force,the pile end resistance and the pile side friction resistance during the static pressure pile penetration process were studied at the fine level.The test results show that the mechanical characteristics of the static pressure pile are closely related to the diameter of the pile,the larger the pile diameter is,the greater the lateral extrusion pressure on the soil,the more obvious the lateral friction resistance of the pile,and the greater the pile compression force.With the increase of the depth of soil entry,the horizontal contact force chain of the soil at the position of the adjacent pile body increases,and the horizontal force chain closer to the pile end is larger,and the dense area of the contact force chain of the soil at the pile end shows a circle.
作者
王永洪
徐泽强
张明义
张利杰
韩勃
梁作栋
蒿雨露
Wang Yonghong;Xu Zeqiang;Zhang Mingyi;Zhang Lijie;Han Bo;Liang Zuodong;Hao Yulu(College of Civil Engineering,Qingdao University of Technology,Qingdao 266033,Shandong,China;China State Construction Port Engineering Group Co.,Ltd.,Qingdao 266032,Shandong,China;School of Civil Engineering,Shandong University,Jinan 250061,China;School of Marine Sciences,Guangxi University,Nanning 530004,China;Qingdao Green Polytechnic Geotechnical Engineering Co.,Ltd.,Qingdao 266033,Shandong,China)
出处
《吉林大学学报(地球科学版)》
北大核心
2025年第5期1619-1628,共10页
Journal of Jilin University:Earth Science Edition
基金
国家重点研发计划项目(2021YFE0113400)
山东省自然科学基金面上项目(ZR2022ME143)。
关键词
静压桩
沉桩过程
室内试验
颗粒流
细观力学
黏性土
jacked pile
sinking process
laboratory tests
PFC numerical
meso mechanical
cohesive soil
