文档介绍：湿陷性黄土地区桩基设计
湿陷性黄土地区桩基设计
摘要:我国分布有大面积的湿陷性黄土,以覆盖广、厚度大著称于世。湿陷性黄土中的桩基在浸水后产生的技术问题早已为工程界所重视,随着国家建设规模的扩大,在大厚度湿陷性黄土中的桩基越来越多。黄土的湿陷现实现象是一个复杂的物理、化学、地质学的变化过程,它受到多方面因素的影响和制约。做好湿陷性换土地区的桩基设计和处理意义重大。本文首先对湿陷性黄土进行了概述,然后提出了该地区桩基础设计的要求和桩基类型的选择,最后对其设计和处理要点进行了阐述。
关键词:湿陷性;黄土;桩基;负摩阻力
Abstract: the distribution of our country has large areas of collapsible loess, well known for its wide coverage, large thickness. Pile in collapsible loess after flooding technology problem has already been attention by engineering, with the expansion of national construction, the large thickness of pile foundation in collapsible loess is increasing. The loess collapsibility of real phenomenon is plex changes in the process of physics, chemistry, geology, it affected and restricted by various factors. Collapsibility well in land area of the pile foundation design and treatment is of great significance. This paper on the collapsible loess were summarized, and then puts forward the requirements for pile foundation design and pile foundation types in the region of choice, finally the design and processing on the key points are expounded.
Key words: wet sex; The loess; Pile foundation; Negative friction resistance
中图分类号:+1文献标识码:A文章编号:2095-2104(2013)
湿陷性黄土概述
我国是世界上黄土面积分布最广泛的国家之一,其中约占3/4的黄土为湿陷性黄土。其最主要的特性是在土的白重压力或自重压力与附加压力共同作用下受水浸湿而产生的大量而急剧的附加下沉,会在桩侧表面产生的负摩阻力。负摩阻力会成为附加于桩侧表面的下曳荷载。
湿陷性黄土中的负摩阻力与浸水时桩顶有无荷载有