摘要
本文以软土地基中的复合沉井基础为研究对象,开展了2种不同埋深的真型基础现场抗拔承载性能试验,对比分析了试验基础的荷载—位移曲线、抗拔承载力和地基破坏模式。研究结果表明:沉井深度的增加,导致基础荷载—位移曲线由“陡降型”转变为“缓变型”,变形特征由“弹脆性”转变为“弹塑性”,抵抗大变形的能力提高;沉井深度增加1倍,其抗拔承载力及极限位移分别提高21%和1.1倍;上拔荷载作用下的复合沉井基础,其周围土体经历了“土体受拉破坏—局部剪切破坏—整体剪切破坏”的变化过程,其影响范围主要受上部承台结构尺寸及地基土性质的影响。
In this paper, the composite open caisson foundation in soft soil is studied. The field uplift bearing capacity tests of two real foundations with different buried depths are carried out, and the load-displacement curve, uplift bearing capacity and foundation failure mode of the test foundation are compared and analyzed. The results show that with the increase of caisson depth, the foundation load-displacement curve changes from "steep drop" to "slow-change", and the deformation characteristics changes from "elastic brittleness" to "elastic-plastic", which improves the ability to resist large deformation;when the depth of open caisson is doubled, its uplift bearing capacity and ultimate displacement are increased by 21% and 1.1 times respectively;for the composite open caisson foundation under uplift load, the surrounding soil has experienced the failure process of "soil tensile failure-local shear failure-overall shear failure", and its influence range is mainly affected by the size of upper bearing platform structure and the properties of foundation soil.
作者
林祥军
张金龙
杨文智
崔强
Lin Xiangjun;Zhang Jinlong;Yang Wenzhi;Cui Qiang(States Grid Lianyungang Power Supply Company,Lianyungang 222000,China;China Electric Power Research Institute,Bejing 102401,China)
出处
《工程勘察》
2023年第3期1-6,共6页
Geotechnical Investigation & Surveying
基金
国网江苏省电力公司科技项目(J2020036)。
关键词
软土
复合沉井基础
现场试验
抗拔承载特性
soft soil
composite open caisson foundation
field test
uplift bearing characteristics
