宁波庆丰大桥锚碇室内相似模型试验研究  

Research on Similarity Model Test of Anchorage of Qingfeng Suspension Bridge in Ningbo

作　　者：李家平[1] 张子新[1] 黄宏伟[1] 李永盛[1] 

机构地区：[1]同济大学地下建筑与工程系,上海200092

出　　处：《同济大学学报（自然科学版）》2005年第8期1011-1016,共6页Journal of Tongji University:Natural Science

基　　金：上海市重点学科建设基金资助项目

摘　　要：根据相似理论,对宁波庆丰悬索桥重力式锚碇进行了室内相似模型试验研究.相似模型的几何相似常数为1∶100,重力相似常数为1∶1.325.试验表明,软土中锚碇自身和相邻土体的变位、土体中附加应力分布等随锚索力和时间的变化规律为在锚索力作用下,锚碇不仅向前水平位移,而且产生前端下沉、后端隆起的刚体转动,相应的基底应力前端增加,后端减小;锚碇前面表层土体出现隆起和向前水平位移,水平向附加应力增大;位移和附加应力随锚索力的增加而增大,随测点与锚碇距离增加而减小,但随时间发展均趋于稳定.此外,锚碇基础下部地基加固,锚碇基坑围护结构以及锚碇周围土体对提高锚碇稳定性具有显著作用.Based on the similarity theory, this paper presents a model test of gravity anchorage of Ningbo Qingfeng suspension bridge with geometrical scale 1 ： 100 and soil mass force scale 1 ： 1. 325. Test results show that the displacement of adjacent soil mass and anchorage itself and the distribution of additional stress in soil mass change with time under different loads as follows, for the designing load, model test shows that anchorage itself has horizontal displacement and rigid rotation with forepart sinking and back-end heaving. Accordingly, additional stress in sub-soil mass increases in the forepart and reduces in the back-end. In addition,surface soil in the front of anchorage uplifts and moves forward with an increase of additional stress. Displacement and additional stress increase with the designing load added and decrease with the increasing of the distance from the measuring sites to anchorage itself. However, displacement and additional stress are in stable state with passage of time. Furthermore, soil improvement, pit-supporting structure and surrounding soil mass contribute greatly to the stability of the bridge anchorage.

关 键 词：悬索桥 相似理论 重力式锚碇 相似模型试验 

分 类 号：U442[建筑科学—桥梁与隧道工程]