›› 2018, Vol. 39 ›› Issue (10): 3755-3762.doi: 10.16285/j.rsm.2017.0068

• Geotechnical Engineering • Previous Articles     Next Articles

Field test on composite foundation with thick cushion and sand pile group

WANG Zheng-zhen1, 2, GONG Wei-ming1, 2, DAI Guo-liang1, 2, WANG Xiao-yang3, LI Liang-liang3, XIAO Gang3   

  1. 1. Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education, Southeast University, Nanjing, Jiangsu 210096, China; 2. School of Civil Engineering, Southeast University, Nanjing, Jiangsu 210096, China; 3. Zhejiang Provincial Institute of Communication Planning, Design & Research, Zhejiang, Hangzhou 310016, China
  • Received:2017-01-11 Online:2018-10-11 Published:2018-11-04
  • Supported by:
    This work was supported by the National Program on Key Basic Research Project of China (973 Program) (2013CB036304) and the Special Project of Important Science and Technology of Transport of Ministry of Transport in Twelfth-Five Year Plan Period (2011318494160).

Abstract: Base on the foundation treatment of south anchorage caisson of Wenzhou Oujiang Estuary Bridge, nine groups of field static loading tests on composite foundation with thick cushion and sand pile group of different cushion materials, cushion thicknesses and pile spacings were performed to study the application of this composite foundation and influencing factors of its bearing capacity. The interaction test on sand piles installation was conducted to investigate the impact of sand pile installation on completed sand piles. The results show that thick cushion and sand pile group, which can strengthen the soft foundation very well, is an ideal way of foundation treatment of super-large caissons. Water content of cushion, material of cushion and thickness of cushion have greater influence on bearing capacity than pile spacing. Because of the differences between the impact on sand pile and the impact on soil which are caused by installation of sand pile, it is inaccurate to use compaction effect of static-press pile to analyze the impact on existing sand pile. The impact on existing sand pile is very large and the maximum impact concentrates on the 1/3 pile length below earth surface. At the same time, the better of soil property, the smaller of this impact. A big pile spacing and blocking effect of existing sand pile can effectively reduce the impact.

Key words: large-scale caisson, composite foundation, static loading test, influencing factor, horizontal displacement

CLC Number: 

  • TU 473.1
[1] ZHAO Jiu-bin, LIU Yuan-xue, HE Shao-qi, YANG Jun-tang, BAI Zhun, . Mathematical statistical model of horizontal displacement and rainfall of step deformation landslide in Three Gorges reservoir area [J]. Rock and Soil Mechanics, 2020, 41(S1): 305-311.
[2] LANG Rui-qing, YANG Ai-wu, YAN Shu-wang, . Analysis of consolidation properties of rigid pile composite foundation based on modified equal strain assumption [J]. Rock and Soil Mechanics, 2020, 41(3): 813-822.
[3] HUANG Yu-hua, XU Lin-rong, ZHOU Jun-jie, CAI Yu, . Calculation of pile-soil stress in pile-net composite foundation based on improved Terzarghi method [J]. Rock and Soil Mechanics, 2020, 41(2): 667-675.
[4] SHEN Hong, LI Xiao, LEI Mei-qing, XU Wen-bo, YU Xiu-ling, . Conception and model test of shear bond supporting system [J]. Rock and Soil Mechanics, 2019, 40(7): 2574-2580.
[5] TANG Xiao-wu, YANG Xiao-qiu, YU Yue. Analytical solutions to drained consolidation of porous pipe pile [J]. Rock and Soil Mechanics, 2019, 40(4): 1248-1254.
[6] YIN Feng, ZHOU Hang, LIU Han-long, CHU Jian, . Experimental investigation on dynamic characteristics of XCC pile-geogrid composite foundation under static and dynamic loads of vehicles [J]. Rock and Soil Mechanics, 2019, 40(4): 1324-1330.
[7] RUI Rui, SUN Yi, ZHU Yong, WU Duan-zheng, XIA Yuan-you, . Mesoscopic working mechanism of cushion of composite foundation under rigid slab [J]. Rock and Soil Mechanics, 2019, 40(2): 445-454.
[8] HU Ming-jian, ZHANG Chen-yang, CUI Xiang, LI Kun-yao, TANG Jian-jian, . Experimental study on capillary rise and influencing factors in calcareous sand [J]. Rock and Soil Mechanics, 2019, 40(11): 4157-4164.
[9] ZHONG Zu-liang, BIE Cong-ying, FAN Yi-fei, LIU Xin-rong, LUO Yi-qi, TU Yi-liang, . Experimental study on grouting diffusion mechanism and influencing factors of soil-rock mixture [J]. Rock and Soil Mechanics, 2019, 40(11): 4194-4202.
[10] CHEN Chang-fu, QIU Lin-qi, MAO Feng-shan, ZHOU Zhi-jun, . Design optimization of pile-net composite foundation based on perturbation-weighted symbiotic organisms search (PWSOS) algorithm [J]. Rock and Soil Mechanics, 2019, 40(11): 4477-4485.
[11] ZHOU Yong, LING Yong-qiang, YANG Xiao-hui, . Relationship between the displacement and stability of pile anchor retaining structure considering additional stress [J]. , 2018, 39(8): 2913-2921.
[12] HUANG Jun-jie, WANG Wei, SU Qian, LI Ting, WANG Xun,. Deformation and failure modes of embankments on soft ground reinforced by plain concrete piles [J]. , 2018, 39(5): 1653-1661.
[13] JIANG Wen-yu, LIU Yi, . Determination of neutral plane depth and pile-soil stress ratio of the rigid pile composite foundation [J]. Rock and Soil Mechanics, 2018, 39(12): 4554-4560.
[14] LI Lian-xiang, HUANG Jia-jia, FU Qing-hong, CHENG Xiao-yang, HU Feng, . Centrifuge experimental study of mechanical properties of composite foundation with different replacement rates under additional load [J]. , 2017, 38(S1): 131-139.
[15] KONG Gang-qiang, SUN Guang-chao, LIU Han-long, GU Hong-wei, . Experimental study of XCC pile-raft composite foundation under different excitation frequencies [J]. , 2017, 38(5): 1379-1384.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!