摘要
为了提高裙式吸力桩的承载力,使其更易于沉贯且能更好地保护主桶周围土体免受洋流刨蚀,提出了一种新型低裙式吸力桩模型,采用双桶负压法沉贯该桩,能有效减小土塞高度。提出的超低位真空预压法能够快速固结土体,缩短试验周期,采用该方法加固的土体,能够较好地模拟强度沿深度增加的地基土。在该土体上采用抽真空法沉贯不同规格的吸力桩模型,对比研究低裙式吸力桩的可贯性,分析其沉贯阻力,结合试验数据拟合出了沉贯阻力公式。最后,通过45°斜拉试验并结合PLAXIS 3D软件对吸力桩承载力展开研究,对比试验与数值模拟结果,分析新型低裙式吸力桩的合理性。
A new model of the low skirted suction caisson was proposed to improve its bearing capacity and make it easy to penetrate and protect the soil around the barrel from the ocean current. Penetrating the caisson with a double barrel of vacuum pressure can not only improve the penetration but also effectively reduce the height of soil plug. A new method of ultra-low underneath vacuum preloading was put forward to consolidate soft soil and shorten the period quickly. The soil reinforced by this method can better simulate the foundation soil with increased strength along the depth. The suction caisson models with different specifications by the vacuum method were penetrated into soil, and then the feasibility of the low skirted suction caisson was comparatively studied. The penetration resistance was analysed, and then a corresponding formula was deduced by fitting experimental data. The bearing capacity of the suction caisson was studied by the 45° pullout test combined with the finite element analysis of PLAXIS 3D software. Finally, the rationality of the low skirted suction caisson was verified.
作者
柳晓科
鹿群
路士伟
刘春龙
郭少龙
LIU Xiao-ke;LU Qun;LU Shi-wei;LIU Chun-long;GUO Shao-long(School of Civil Engineering, Tianjin Chengjian University, Tianjin 300384, China;North China Municipal Engineering Design and Research Institute Co. Ltd., Tianjin 300381, China;Tianjin Key Laboratory of Soit Soil Characteristics and Engineering Environment, Tianjin Chengiian University, Tianjin 300384 China;PowerChina Huadong Engineering Corporation Limited, Hangzhou, Zhejiang 310014)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2018年第6期2089-2098,共10页
Rock and Soil Mechanics
基金
天津市应用基础与前沿技术研究计划一般项目(No.15JCYBJC48900)
中国电建集团科技项目(No.SD2013-10)~~
关键词
低裙式吸力桩
超低位真空预压法
沉贯阻力
土塞效应
承载力
low skirted suction caisson
underneath vacuum preloading
penetration resistance
soil plug effect
bearing capacity
