Numerical investigation of the convex effect on the behavior of crossing excavations |
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Authors: | Min Zhang Xing-hua Wang Guang-cheng Yang and You Wang |
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Institution: | (1) Civil Engineering Department, Shanghai Jiaotong University, 1954 Hua Shan Road, Shanghai, China |
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Abstract: | 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. |
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