[1]曾俊铖,张继文,童小东,等.高速铁路CFG桩-筏复合地基沉降试验研究[J].东南大学学报(自然科学版),2010,40(3):570-574.[doi:10.3969/j.issn.1001-0505.2010.03.026]
 Zeng Juncheng,Zhang Jiwen,Tong Xiaodong,et al.In-situ test on settlement of CFG pile-raft composite foundation in high-speed railway[J].Journal of Southeast University (Natural Science Edition),2010,40(3):570-574.[doi:10.3969/j.issn.1001-0505.2010.03.026]
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高速铁路CFG桩-筏复合地基沉降试验研究()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
40
期数:
2010年第3期
页码:
570-574
栏目:
土木工程
出版日期:
2010-05-20

文章信息/Info

Title:
In-situ test on settlement of CFG pile-raft composite foundation in high-speed railway
作者:
曾俊铖 张继文 童小东 涂永明
东南大学土木工程学院,南京 210096
Author(s):
Zeng Juncheng Zhang Jiwen Tong Xiaodong Tu Yongming
School of Civil Engineering, Southeast University, Nanjing 210096, China
关键词:
高速铁路 桩-筏复合地基 现场试验 沉降 水泥粉煤灰碎石桩
Keywords:
high-speed railway pile-raft composite foundation in-situ test settlement cement fly-ash gravel(CFG)pile
分类号:
TU413.6
DOI:
10.3969/j.issn.1001-0505.2010.03.026
摘要:
为了解路堤荷载作用下CFG桩-筏复合地基沉降变形特性,在京沪高速铁路凤阳试验段进行了沉降变形现场试验.设置沉降板、观测桩和测斜管,分别监测地基面桩土沉降、路基顶面沉降和地基侧向水平位移,分析了沉降变形随路堤填筑高度和时间的变化规律,探讨了双曲线沉降预测方法.研究结果表明:CFG桩-筏复合地基沉降随路堤填筑高度和时间的增加而增大; 路基经过6个多月的静置后,沉降已趋于稳定; 复合地基总沉降量小于15 mm,桩土沉降差小于2 mm; 路堤坡脚线外1 m处的地基侧向最大水平位移小于4 mm; 采用双曲线法进行路基沉降预测是可行的,且预测精度较高.采用CFG桩-筏复合处理后的地基总沉降、沉降差和水平位移均较小,路基沉降稳定较快,能够提高路基的稳定性并缩短工期.
Abstract:
To understand the characteristics of settlement and deformation of the CFG(cement fly-ash gravel)pile-raft composite foundation under embankment loads, the in-situ test on settlement and deformation is carried out in the Fengyang experimental section of the Beijing-Shanghai high-speed railway. The settlements of pile and soil of the foundation top surface, the settlements of the subgrade top surface, and the lateral displacements of the foundation are monitored by the settlement plates, the observation piles and the inclinometers, respectively. The variation laws of the settlement and deformation with the embankment height and the time are analyzed. And the hyperbolic curve method for settlement prediction is discussed. The results show that the settlements of the CFG pile-raft composite foundation increase with the filling height of the embankment and the time. The settlements tend to be stable after standing more than 6 months of subgrade. The total settlements and pile-soil differential settlements of the composite foundation are less than 15 mm and 2 mm, respectively. The maximum lateral displacement of the foundation at 1 m from the toe of the embankment is less than 4 mm. The hyperbolic curve method is feasible for the settlement prediction of the subgrade and the prediction precision is high. The total settlement, differential settlement and lateral displacement of the foundation improved by CFG piles and rafts are small, and the settlement of the subgrade quickly becomes stable. The stability of the subgrade can be improved and the construction period can be shortened by ground improvement with CFG pile-raft.

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备注/Memo

备注/Memo:
作者简介: 曾俊铖(1982—),男,博士生; 张继文(联系人),男,博士,教授,博士生导师,jwzhang@vip.163.com.
基金项目: 铁道部重点科研资助项目(2007G046).
引文格式: 曾俊铖,张继文,童小东,等.高速铁路CFG桩-筏复合地基沉降试验研究[J].东南大学学报:自然科学版,2010,40(3):570-574. [doi:10.3969/j.issn.1001-0505.2010.03.026]
更新日期/Last Update: 2010-05-20