Experimental study on pile-end post-grouting piles for super-large bridge pile foundations

doi:10.1007/s11709-009-0019-0

Front Arch Civil Eng Chin

2009, Vol. 3

Issue (2) : 228-233 https://doi.org/10.1007/s11709-009-0019-0

RESEARCH ARTICLE

Experimental study on pile-end post-grouting piles for super-large bridge pile foundations

Weiming GONG(

), Guoliang DAI, Haowen ZHANG

Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education, Southeast University, Nanjing 210096, China

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Abstract

The application of pile-end post-grouting piles for super-large bridge pile foundations in some important projects was introduced in this paper. There are totally 21 test piles. The maximum pile diameter varies from 2.5 m to 3 m, and the maximum length is 125 m; the bearing capacity of the post-grouting piles is over ten thousands tons. Based on the test results, the bearing capacity, displacement, and bearing characteristic before and after grouting were analyzed. The results show that the bearing capacity of the piles are increased in different degrees after grouting although the technical parameters, including the patterns of grouting pipes, pressure, dosages of cement, duration of grouting lasting time, are different. However, the obtained values are very discrete. In addition, the calculation formula for the post-grouting piles under specified grouting condition was deduced based on the statistics analysis results of 57 test piles. The research results have been applied in the design of bridge foundation.

Keywords self-balanced testing technique pile-end post-grouting bearing capacity grouting technology

Corresponding Author(s): GONG Weiming,Email:seugongwm@sina.com

Issue Date: 05 June 2009

Cite this article:

Weiming GONG,Guoliang DAI,Haowen ZHANG. Experimental study on pile-end post-grouting piles for super-large bridge pile foundations[J]. Front Arch Civil Eng Chin, 2009, 3(2): 228-233.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-009-0019-0
https://academic.hep.com.cn/fsce/EN/Y2009/V3/I2/228

Fig.1 Relationship of displacement on pile-top and bearing capacity before and after grouting for SZ4.
(a) Before grouting; (b) after grouting

Tab.1 Parameters of piles and ultimate capacity before and after grouting for Sutong Yangtze River Bridge

Tab.2 Pile testing parameters of Eastsea Bridge

Tab.3 Comparison of Eastsea Bridge before and after grouting

Fig.2 Relationship of load and settlement before and after grouting for two piles. (a) PM336; (b) PM241

Tab.4 Parameters of Hangzhou Bay Sea-Crossing Bridge

Tab.5 Parameters of test piles

Tab.6 Improvement coefficient of and after grouting

Tab.7 Empirical coefficient of grout quantity

Tab.8 Comparison of test piles

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