水平荷载作用下粉质土地基单桩p-y曲线试验研究
发布时间：2018-10-15 18:56
【摘要】：桩基是海洋平台、海洋风力发电机、海上输电塔等近海工程基础的主要形式，主要用来抵抗波浪荷载和风荷载等水平荷载。研究桩基在水平荷载作用下的表现形式的方法有很多种，p-y曲线法是国内外最为广泛使用的方法。砂土和软粘土的p-y曲线研究起步最早，也最成熟，而对于黄河三角洲新近沉积粉质土的p-y曲线研究尚缺乏研究。 本文针对黄河三角洲地区，以新沉积粉土为地基土，通过室内水平加载试验，根据桩身弯矩、桩身水平位移和桩周土抗力三者之间的关系，得出黄河三角洲地区饱和粉土地基单桩p-y曲线，并与现有的五种p-y曲线进行比较，，最终以双曲线型p-y曲线形式，得出了适用于黄河三角洲粉质土地区p-y曲线计算方法。 文中详细介绍了水平荷载作用下单桩工作性状和承载力的几种计算方法，对比得出p-y曲线法的优点。介绍了本文模型试验的原理、模型的制作方法以及模型桩抗弯刚度的计算。通过四组对比试验，得出了模型桩的埋置方式、加载点位置以及地基土超固结对p-y曲线的影响。
[Abstract]:Pile foundation is the main form of offshore engineering foundation, such as offshore platform, offshore wind turbine and offshore transmission tower, which is mainly used to resist horizontal loads such as wave load and wind load. There are many methods to study the expression of pile foundation under horizontal load. The p-y curve method is the most widely used method at home and abroad. The study on p-y curve of sandy soil and soft clay is the first and most mature, but the study of p-y curve of newly deposited silty soil in the Yellow River Delta is still lacking. In this paper, according to the relationship among bending moment, horizontal displacement of pile body and resistance of soil around pile, the newly deposited silt is taken as foundation soil in the Yellow River Delta region, and through indoor horizontal loading test, the relationship between pile bending moment, horizontal displacement of pile body and resistance of soil around pile is discussed. The p-y curves of single pile on saturated silt foundation in the Yellow River Delta region are obtained, and compared with five kinds of p-y curves. Finally, the calculation method of p-y curve is obtained in the form of hyperbolic p-y curve, which is suitable for the silty soil area of the Yellow River Delta. In this paper, several calculation methods of the working behavior and bearing capacity of the pile under horizontal load are introduced in detail, and the advantages of p-y curve method are compared. This paper introduces the principle of the model test, the method of making the model and the calculation of the bending stiffness of the model pile. Through four groups of comparative tests, the influence of the buried mode of the model pile, the position of the loading point and the over-consolidation of the foundation soil on the p-y curve is obtained.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P751
本文编号：2273512
[Abstract]:Pile foundation is the main form of offshore engineering foundation, such as offshore platform, offshore wind turbine and offshore transmission tower, which is mainly used to resist horizontal loads such as wave load and wind load. There are many methods to study the expression of pile foundation under horizontal load. The p-y curve method is the most widely used method at home and abroad. The study on p-y curve of sandy soil and soft clay is the first and most mature, but the study of p-y curve of newly deposited silty soil in the Yellow River Delta is still lacking. In this paper, according to the relationship among bending moment, horizontal displacement of pile body and resistance of soil around pile, the newly deposited silt is taken as foundation soil in the Yellow River Delta region, and through indoor horizontal loading test, the relationship between pile bending moment, horizontal displacement of pile body and resistance of soil around pile is discussed. The p-y curves of single pile on saturated silt foundation in the Yellow River Delta region are obtained, and compared with five kinds of p-y curves. Finally, the calculation method of p-y curve is obtained in the form of hyperbolic p-y curve, which is suitable for the silty soil area of the Yellow River Delta. In this paper, several calculation methods of the working behavior and bearing capacity of the pile under horizontal load are introduced in detail, and the advantages of p-y curve method are compared. This paper introduces the principle of the model test, the method of making the model and the calculation of the bending stiffness of the model pile. Through four groups of comparative tests, the influence of the buried mode of the model pile, the position of the loading point and the over-consolidation of the foundation soil on the p-y curve is obtained.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P751
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本文编号：2273512
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