CLC number: TU472.21
On-line Access: 2020-07-13
Received: 2019-09-16
Revision Accepted: 2019-12-24
Crosschecked: 2020-06-15
Cited: 0
Clicked: 3894
Wei-le Chen, Chao Guo, Xiao He, Bai-yong Fu, Jian Liu. Experimental study on the mechanical behavior and deformation characteristics of gravel cushion in an immersed tube tunnel[J]. Journal of Zhejiang University Science A, 2020, 21(7): 514-524.
@article{title="Experimental study on the mechanical behavior and deformation characteristics of gravel cushion in an immersed tube tunnel",
author="Wei-le Chen, Chao Guo, Xiao He, Bai-yong Fu, Jian Liu",
journal="Journal of Zhejiang University Science A",
volume="21",
number="7",
pages="514-524",
year="2020",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1900408"
}
%0 Journal Article
%T Experimental study on the mechanical behavior and deformation characteristics of gravel cushion in an immersed tube tunnel
%A Wei-le Chen
%A Chao Guo
%A Xiao He
%A Bai-yong Fu
%A Jian Liu
%J Journal of Zhejiang University SCIENCE A
%V 21
%N 7
%P 514-524
%@ 1673-565X
%D 2020
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1900408
TY - JOUR
T1 - Experimental study on the mechanical behavior and deformation characteristics of gravel cushion in an immersed tube tunnel
A1 - Wei-le Chen
A1 - Chao Guo
A1 - Xiao He
A1 - Bai-yong Fu
A1 - Jian Liu
J0 - Journal of Zhejiang University Science A
VL - 21
IS - 7
SP - 514
EP - 524
%@ 1673-565X
Y1 - 2020
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1900408
Abstract: The immersed tube tunnel section of the Shenzhen-Zhongshan Link exhibits complex geological conditions and high back sludge strength. The tunnel cushion adopts the gravel and flaky stone combined cushion. The major influencing factors of the mechanical deformation characteristics of the gravel and flaky stone composite cushion are studied through a physical model experiment. The following results are reported. (1) The load–settlement curves of the flaky stone cushion become more compact with a dense increment under the design load. These curves can be regarded as nonlinear mechanical characteristics. The load–settlement curves of the gravel cushion and the gravel and flaky stone composite cushion exhibit the characteristics of a two-stage linear change. (2) The flatness of the top of flaky stone cushion considerably affects settlement and secant modulus. The flatness of the top of flaky stone should be ensured during construction. (3) Gradation and thickness exert no evident effect on the compressibility of a cushion. The preloading pressure caused by the construction height difference of the cushion materials plays an important role in improving the initial stiffness of a cushion and reducing initial settlement and overall settlement. (4) This study investigates the preloading under 30 kPa of the 0.7-m flaky stone and 1.0-m gravel combination cushion. It recommends the following secant modulus values: 48.89 MPa for the section of 0–30 kPa and 10.47 MPa for the section of 30–110 kPa.
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