摘要
作为水域环境中桥梁桩基施工围堰结构,钢护筒得到越来越广泛的应用,钢护筒与钢筋混凝土桩形成钢管混凝土复合桩,其横轴向承载特性与普通钢筋混凝土桩存在巨大差异。针对水域环境中钢管混凝土复合桩的特点,选取钢管埋深和钢管挤土区土体模量两种研究变量,通过离心模型试验的方法研究了钢管混凝土复合桩的横轴向承载特性,得到了钢管混凝土复合桩的桩侧土抗力曲线、H-y曲线及桩身弯矩曲线。试验结果表明:钢管埋深在12cm范围内增大时,能明显提高钢管混凝土复合桩横轴向极限承载力,超过12cm后继续增大钢管埋深,钢管混凝土复合桩横轴向极限承载力仍继续增大,但增幅已不明显;钢管挤土区土体模量的增大能提高钢管混凝土复合桩横轴向极限承载力,但增幅度较小。研究成果将为钢管混凝土复合桩的设计与施工提供理论依据与技术保障。
As the cofferdam of bridge pile in the aquatic environment, Steel casing is more widely applied, steel pipe concrete composite pile is formed by steel casing and reinforced concrete piles. There is a huge difference between the horizontal bearing characteristics of the steel pipe concrete composite pile and reinforced concrete pile. Aimed at the steel pipe concrete composite pile in in the aquatic environment, the steel pipe depth and the steel pipe soil compaction zone soil modulus are selected as analysis variables, steel pipe concrete composite pile horizontal bearing characteristics is studied by centrifuge model tests, soil resistance curve, H-y curve and moment curve of steel pipe concrete composite pile are obtained. The result shows： Horizontal bearing characteristics of steel pipe concrete composite pile can be increased obviously when the steel pipe depth is increased in 12m; Horizontal bearing characteristics of steel pipe concrete composite pile is increased very small when the steel pipe depth is increased out of 12m and steel pipe soil compaction zone soil modulus is increased. The design and construction of steel pipe concrete composite pile are supported by the result of centrifuge model tests.
出处
《土木工程学报》
EI
CSCD
北大核心
2018年第1期114-123,128,共11页
China Civil Engineering Journal
基金
国家自然科学基金(41272285)
广东省交通科技攻关项目(2011-01-001)
关键词
钢管混凝土复合桩
离心模型试验
桩侧土抗力
H-y曲线
桩身弯矩
pipe steel concrete composite pile
centrifuge model tests
oil resistance of pile
H-y curve
moment of pile
