Experimental Research on the Settlement Feature of Two Ground Deformation Modes Induced by Tunnelling

Qingtao Lin, Caixia Guo, Xu Meng, Hongyu Dong and Fanchao Kong ()
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Qingtao Lin: Department of Civil Engineering, School of Civil Engineering, Tsinghua University, Beijing 100084, China
Caixia Guo: Institute of Geotechnical and Underground Engineering, Beijing University of Technology, Beijing 100124, China
Xu Meng: Institute of Geotechnical and Underground Engineering, Beijing University of Technology, Beijing 100124, China
Hongyu Dong: Institute of Geotechnical and Underground Engineering, Beijing University of Technology, Beijing 100124, China
Fanchao Kong: Institute of Geotechnical and Underground Engineering, Beijing University of Technology, Beijing 100124, China

Mathematics, 2023, vol. 11, issue 10, 1-24

Abstract: Two ground deformation modes, i.e., the arching mode and collapsing mode, may be caused by tunnel excavation. However, the development of the ground deformation corresponding to the two modes is unclear. A piece of a model test facility is designed to study the ground settlement induced by tunnel excavation. Tunnel excavation is realized by decreasing the area of the model tunnel. Two model tests with different soil cohesion are conducted, and the two ground deformation modes form in the two tests, respectively. The former mode is observed at higher soil cohesion while the latter is found to develop at lower soil cohesion. Whether the failure surface develops to the ground surface or not is the most significant difference between the two ground deformation modes. In the two modes, the failure surface occurs at the position where the ground settlement contours distribute densely, and the shape of the failure surface can be described by the semi-oval for both modes. Meanwhile, for both the arching mode and the collapsing mode, Gaussian curves can reasonably describe the ground settlement troughs before the ground surface settlement becomes stable or increases sharply, and distribution of the trough width parameter is similar.

Keywords: tunnel excavation; model test; arching mode; collapsing mode; ground settlement (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2023
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