Centrifuge tests on deformation and failure mechanism of existing structures induced by displacements of excavation face

ZHANG Jianhong; WANG Aixia; CHEN Xiangsheng

doi:10.11779/CJGE2024S10003

Volume 46 Issue S1

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Chinese Journal of Geotechnical Engineering > 2024 > 46(S1): 6-10. > DOI: 10.11779/CJGE2024S10003

ZHANG Jianhong, WANG Aixia, CHEN Xiangsheng. Centrifuge tests on deformation and failure mechanism of existing structures induced by displacements of excavation face[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(S1): 6-10. DOI: 10.11779/CJGE2024S10003

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Centrifuge tests on deformation and failure mechanism of existing structures induced by displacements of excavation face

1.
State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
2.
College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China

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Received Date: April 28, 2024

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Abstract

Abstract

The development of cities often involves the construction of new tunnels underneath densely distributed existing structures. When the tunnels experience complicated and difficult conditions, failure may occur at the tunnel face and pose great threat to the existing structures. The results of three centrifuge tests to simulate existing structures in a uniform silt and in the silt with a 4 m thick clay layer are introduced. A technique is developed to simulate the instability of the excavation face and reproduce the failure mode. The tests show that when the displacement of the excavation face is controlled (0.48H, where H is the excavation height) or there is a clay interlayer near the excavation surface, soil arching is formed to confine the failure and reduce the deformation and strain of the existing tunnel. When the displacement of the excavation face increases to 0.83H, an overall collapse is trigged and induce significant deformation and strain on the existing tunnel.
- existing structure,
- instability of tunnel face,
- deformation and failure mechanism

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