摘要
软土由于具有含水量高、压缩性大、抗剪强度低等特点,使得在其上修建建筑物时承载力往往得不到满足。对此,可从结构自身出发,充分利用土体与结构物的相互作用,进而达到提高承载力的目的。首先进行了室内试验,通过试验实测沉降曲线与有限元模拟的沉降曲线的对比分析,得出了选用Plaxis中的Hardening-Soil模型模拟箱筒型结构在软土地基上作用的合理性。然后,分别就该结构处于单层土体和多层土体上的承载力问题进行了研究,并主要探讨了极限承载力随结构形式、结构尺寸、土体参数以及土层厚度变化的规律,从而提出了单层土体上方形结构、圆形结构和条形结构的极限承载力修正公式。最后,利用有限元对天津港防波堤延伸工程中的箱筒型防波堤进行了承载力验算。
When structures are built on soft soil,the bearing capacity can be hardly satisfied as the soil has the characteristics of high water ratio,high compressibility and poor shear strength.However,the bearing capacity can be improved through structure itself by taking full advantage of the interaction between the structure and soil.Firstly,an experiment is carried out to compare the measured value of the experiment with that of the Plaxis simulation.The results show that the Hardening-Soil model is able to simulate the bearing capacities of the box and bucket foundation on soft soil.Then,the ultimate bearing capacity of the structure on one layer soil and stratified soil are studied.The influence factors of structure form,structure dimension,parameter of soil and the thickness of the layer are analyzed,and modified formulas of quadrate,circular and strip box and bucket foundation are concluded.Finally,using FEM program Plaxis,the paper establishes a numerical analysis model for the box and bucket foundation of Tianjin harbor breakwater extension project.
出处
《水运工程》
北大核心
2011年第6期136-142,共7页
Port & Waterway Engineering
