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CLC number: TU473

On-line Access: 2011-06-27

Received: 2011-02-07

Revision Accepted: 2011-06-07

Crosschecked: 2011-09-08

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Journal of Zhejiang University SCIENCE A 2011 Vol.12 No.10 P.747-757


Numerical investigation of the convex effect on the behavior of crossing excavations

Author(s):  Min Zhang, Xing-hua Wang, Guang-cheng Yang, You Wang

Affiliation(s):  School of Civil Engineering, Central South University, Changsha 410075, China

Corresponding email(s):   zhangmin021410@126.com, xhwang@mail.csu.edu.cn

Key Words:  Crossing excavation, Convex effect, Constitutive model, Numerical simulation

Min Zhang, Xing-hua Wang, Guang-cheng Yang, You Wang. Numerical investigation of the convex effect on the behavior of crossing excavations[J]. Journal of Zhejiang University Science A, 2011, 12(10): 747-757.

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author="Min Zhang, Xing-hua Wang, Guang-cheng Yang, You Wang",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

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%T Numerical investigation of the convex effect on the behavior of crossing excavations
%A Min Zhang
%A Xing-hua Wang
%A Guang-cheng Yang
%A You Wang
%J Journal of Zhejiang University SCIENCE A
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%N 10
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%@ 1673-565X
%D 2011
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1100028

T1 - Numerical investigation of the convex effect on the behavior of crossing excavations
A1 - Min Zhang
A1 - Xing-hua Wang
A1 - Guang-cheng Yang
A1 - You Wang
J0 - Journal of Zhejiang University Science A
VL - 12
IS - 10
SP - 747
EP - 757
%@ 1673-565X
Y1 - 2011
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A1100028

A 3D numerical model considering the soil-structure interaction is presented in this paper to examine the ground movement and internal force during the construction of Qingdao North Metro Station, China with a special focus on the convex effect of the crossing excavation. The influence of intersection angles and soil resilience characteristics on deformation behavior is discussed, and the suitability of two alternative constitutive models applied in excavation simulation is also considered. The analysis results show that a notable convex effect appears to be associated with the crossing excavation, and the intersection is the key area requiring special attention. The displacements at the corner decrease with increasing crossing angles. The axial loads of struts along the retaining pile wall are unequal, and the values near the cross section are generally larger than the average loads of the left-sided ones. The modified Cam-Clay (MCC) model, which is capable of describing the loading-unloading criterion and identifying the stiffness difference of strain hardening between loading and unloading, can yield a relatively high accuracy of estimation for the behavior of excavations in comparison to the Mohr-Coulomb (MC) model. Furthermore, slight soil deformation resilience after unloading can reduce the ground surface settlement and enhance the ground stability.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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