沉井基础下沉阻力分布特征研究  

Study on penetration resistance distribution characteristic of sunk shaft foundation

作　　者：陈晓平[1] 茜平一[2] 张志勇[3] 

机构地区：[1]暨南大学 [2]广东水利电力职业技术学院 [3]上海隧道工程股份有限公司施工技术研究所,上海200235

出　　处：《岩土工程学报》2005年第2期148-152,共5页Chinese Journal of Geotechnical Engineering

基　　金：广东省自然科学基金资助项目(021145);广东省科技计划项目(04B32801003)

摘　　要：以海口某大桥主墩的沉井基础为研究对象,对沉井的下沉全过程进行了实时监测,根据大量现场实测资料,系统分析了沉井基础的下沉机理和下沉过程中的受力特性,得出了沉井下沉不同深度,经过不同土层时井壁侧摩阻力和刃脚端阻力的大小及分布规律,提出了下沉系数K和侧壁摩阻力值σf的计算方法和经验公式,以及土压力系数ki的取值范围。在此基础上建立了下沉阻力的计算模型,给出了最大侧壁摩阻力f0的计算公式和分布特征,所得出的结论可供同类工程借鉴与参考。The sinking process of the shaft foundation under a bridge pier in Haiko has been monitored. According to the observed field data, the penetration mechanism and resistance characteristic in sinking process are systematically studied. The distribution of wall side friction and end bearing, daring penetrating into different soil strata is obtained. The computing method and experimental formula of sinking coefficient K, and the value of side friction σf, as well as reference value of earth pressure, are put forward. Then, the computation model of penetration resistance is established. The calculation formula and distribution characteristic of the maximum side friction f0 is submitted. The conclusions obtained in this paper can be used for reference of other engineering project.

关 键 词：沉井基础 下沉阻力 侧摩阻力 现场监测 

分 类 号：TU473.2[建筑科学—结构工程]