|
|
|
| APPLICATION OF CRUST LAYER TO VACUUM PRELOADING DREDGE FILL |
| YAN Shuwang1，GUO Bingchuan1，SUN Liqiang1，LI Wei2 |
(1. School of Civil Engineering，Tianjin University，Tianjin 300072，China；
2. Tianjin Port(Group) Company，Tianjin 300456，China) |
|
|
|
|
Abstract When the vacuum preloading method is applied to improve dredge fill，adequate bearing capacity needs to be provided for the large-scale spile machine installation equipment. A new technique is developed，in which the dredge surface is filled with a certain thickness of silt sand to provide enough bearing capacity to support the spile machine installation performance. A small-scale model test is carried out to intuitively identify the availability of crust improving the bearing capacity of foundation；and bearing characteristics and mechanism of foundation with crust are discussed. Finite element analysis is performed by PLAXIS software，in which the development of the plastic zones and displacement fields can be obtained. The calculated bearing capacity is compared with the analytical solutions achieved by Vesic formula. The contribution of a crust layer with silt sand to the bearing characteristics of foundation in rigid upper layer and soft lower layer is discussed，which can provide the technique with solid theoretical basis.
|
|
Received: 25 December 2012
|
|
|
|
| [1] 董志良，张功新，周 琦，等. 天津滨海新区吹填造陆浅层超软土加固技术研发及应用[J]. 岩石力学与工程学报，2011，30(5)：1 073– 1 080.(DONG Zhiliang，ZHANG Gongxin，ZHOU Qi，et al. Research and application of improvement technology of shallow ultra-soft soil formed by hydraulic reclamation in Tianjin Binhai new area[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(5)：
1 073–1 080.(in Chinese))
[2] 齐永正. 真空预压加固软地基工程实例分析[J]. 人民长江，2010，41(24)：81–85.(QI Yongzheng. Case study on soft-clay foundation reinforcement by vacuum preloading[J]. Yangtze River，2010，41(24)：81–85.(in Chinese))
[3] 经 绯，刘松玉，邵光辉. 软土地基上路堤沉降变形特征分析[J]. 岩土工程学报，2001，23(6)：728–730.(JING Fei，LIU Songyu，SHAO Guanghui. The settlement of embankment on soft ground[J]. Chinese Journal of Geotechnical Engineering，2001，23(6)：728–730.(in Chinese))
[4] 问延煦，周 健. 封闭作用对双层地基临塑荷载的影响[J]. 岩土工程学报，2008，30(5)：685–689.(WEN Yanxu，ZHOU Jian. Critical edge pressure analysis of two-layered ground considering closure effect[J]. Chinese Journal of Geotechnical Engineering，2008，30(5)：685–689.(in Chinese))
[5] 中华人民共和国国家标准编写组. GB/T 5007—2011 建筑地基基础设计规范[S]. 北京：中国建筑工业出版社，2011.(The National Standards Compilation Group of People?s Republic of China. GB/T 5007—2011 Code for design of building foundation[S]. Beijing：China Architecture and Building Press，2011.(in Chinese))
[6] 候 钊，陈 环. 天津软土地基[M]. 天津：天津科学技术出版社，1987：33–44.(HOU Zhao，CHEN Huan. Tianjin soft soil foundation[M]. Tianjin：Tianjin Science and Technology Publishing House，1987：33–44.(in Chinese))
[7] 钱家欢，殷宗泽. 土工原理与计算[M]. 北京：中国水利水电出版社，1996：345–400.(QIAN Jiahuan，YIN Zongze. Geotechnical principle and calculation[M]. Beijing：China Water Power Press，1996：345–400.(in Chinese))
[8] MEYERHOF G G. The ultimate bearing capacity of foundations[J]. Geotechnique，1951，2(4)：301–332.
[9] VESIC A S. Bearing capacity of shallow foundations[J]. Foundation Engineering Handbook，1975，5(4)：121–147.
[10] 赵少伟，王丙兴，郭 蓉. PLAXIS在高速公路软基变形研究中的应用[J]. 路基工程，2008，(4)：20–22.(ZHAO Shaowei，WANG Bingxing，GUO Rong. Research of the deformation on soft ground with PLAXIS[J]. Subgrade Engineering，2008，(4)：20–22.(in Chinese)) |
| [1] |
KANG Hongpu1, 2, 3*, GAO Fuqiang1, 2, 3, WANG Xiaoqing1, 2, 3, YUAN Guiyang1, 2, 3, YANG Lei1, 2, 3, LOU Jinfu1, 2, 3. Development and application of a large-scale experimental system for roadway rockburst induced by fault slip[J]. , 2026, 45(6): 1599-1614. |
|
|
|
|
2013, Vol. 32 
