中国铁道科学2012，Vol.33Issue(4)：13-19,7.DOI:10.3969/j.issn.1001-4632.2012.04.03
深厚软土桥梁桩基荷载传递特性及沉降控制效果研究
Study on the Load Transfer Characteristics and Settlement Control Effect of Bridge Pile Foundation in Deep Soft Soil
摘要
Abstract
The load transfer characteristics and settlement control effect of bridge pile foundation in deep soft soil was investigated through single pile static load test, pile strain test, pile shaft compression test and bridge pier settlement test on Keqiao super large bridge of Hangzhou-Ningbo passenger dedicated line. The results show that the frictional resistance of pile side plays its role prior to pile end resistance. Although the ends of two super-long tested piles are embedded in the strongly weathered tuffaceous sandstone, their end-bearing ratios under various test loads are less than 1. 5%. The bearing properties of the piles present as that of friction pile. The compressions of pile shaft accounts for more than 85% of the settlement at pile top during single pile static load test. After 753 days' settlement observation on the two tested piers since their completion, the measured settlements of two tested piers are only 3. 00 and 3. 41 mm respectively. Among them the measured settlements 300 days after the laying of ballastless track are 0.11 and 0. 25 mm respectively, which illustrates that super long bored piles can effectively control the settlement of bridge foundation in deep soft soil.关键词
桥梁桩基/深厚软土/超长钻孔灌注桩/单桩静载试验/荷载传递特性/桩身变形/沉降控制Key words
Bridge pile foundation/ Deep soft soil/ Super-long bored pile/ Single pile static load test/ Load transfer characteristics/ Deformation of pile shaft/ Settlement control分类
交通工程引用本文复制引用
辛学忠,魏丽敏,何群..深厚软土桥梁桩基荷载传递特性及沉降控制效果研究[J].中国铁道科学,2012,33(4):13-19,7.基金项目
铁道部科技研究开发计划项目(2009G008-B,2010G018-E-3) （2009G008-B,2010G018-E-3）
