苏通大桥主塔超大群桩基础沉降特性研究  

Research on Settlement of Extra-long Large Diameter Pile Groups Under Main Tower of Sutong Yangtse River Highway Bridges

作　　者：邓友生[1] 龚维明[2] 

机构地区：[1]武汉理工大学理学院 [2]东南大学土木工程学院,南京210096

出　　处：《武汉理工大学学报》2008年第7期66-70,共5页Journal of Wuhan University of Technology

基　　金：江苏省交通厅科研项目(04Y029)

摘　　要：针对苏通大桥主桥南塔高承台超大群桩基础,分2步对其沉降进行计算。首先,采用国内外不同方法计算桩身弹性压缩变形量和桩端以下土层的沉降量;其次,将不同方法计算的桩身变形量和土层沉降量组合为总沉降量,并与沉降试验值比较。结果表明,对于超大群桩基础总沉降,桩身的弹性压缩变形量不容忽略,且自重引起的弹性变形量也应考虑;按照文中推得公式计算的桩身弹性变形量与基于Mindlin附加应力解计算压缩土层理论沉降量进行组合的总沉降量与试验值非常吻合,仅偏低0.06%。Two steps have been applied to calculate settlement of extra-long large diameter pile groups under south tower of main bridge of Sutong Yangtse River Highway Bridges. Firstly, pile compression and settlement of soil layers under pile end were separately calculated through methods used by domestic and overseas specifications. Then, different total settlement cornposed of different pile compressions and different soils settlements with the settlement gained by model tests were compared. The results showed that settlement of extra-long large diameter pile groups should calculating piles＇ elastic compression including that caused by pile＇s own weight. It is very little that the difference between settlement test value and total settlement which was composed of piles＇ elastic compression calculated through the formula deduced in the paper and theoretic soils settlement based on Mindlin＇ s additional stress solution, only making 0.06 % lower.

关 键 词：超大群桩 端阻比 桩身压缩 沉降 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]