Study on the Settlement and Deformation Characteristics of Surrounding Rock of Loess Tunnel

Zunzun Du; Gaolei Hu

doi:10.54097/z1ad6452

Authors

Zunzun Du
Gaolei Hu

DOI:

https://doi.org/10.54097/z1ad6452

Keywords:

Loess surrounding rock; tunnel surrounding rock; settlement deformation; Excavation deformation.

Abstract

There is a water culvert with masonry structure in the mountain of Hanguguan Tunnel. Soil deformation caused by tunnel excavation leads to channel cracking. On the one hand, channel water infiltration leads to loess tunnel collapse, which can easily cause engineering accidents and delay the construction period. On the other hand, it will affect the channel water supply and cause social problems. In this paper, the spatial deformation of the tunnel excavation process in the loess layer is revealed through the settlement of the vault in the tunnel, the monitoring of the convergence of the perimeter, and the force monitoring of the lining support structure of the Hanguguan tunnel, and the influence of the tunnel excavation deformation on the culvert is revealed through numerical calculation. The results show that the arch at the tunnel exit has the largest settlement deformation, the larger cumulative settlement, and the faster settlement rate, and the deformation of the culvert is small, only a millimeter. Compared with the monitoring data, the numerical simulation of tunnel excavation and the vertical settlement are basically consistent with the actual situation.

Downloads

Download data is not yet available.

References

[1] Wen B.-P. And Yan Y.-J. “Influence of structure on shear characteristics of the unsaturated loess in Lanzhou”, China, Engineering Geology, (2014) 168, 46–58. https://doi.org/10.1016/j.enggeo.2013.10.023

[2] Shao S. J,Wang L. Q,Shao S, and Wang Q. “Structural yield and collapse deformation of loess”, Chinese Journal of Geotechnical Engineering, (2017) 39, no. 8, 1–9.

[3] Tonon F. “ADECO full-face tunnel excavation of two 260m2 tubes in clays with sub-horizontal jet-grouting under minimal urban cover”, Tunnelling and Underground Space Technology, (2011) 26, no. 2, 253–266. https://doi.org/10.1016/j.tust.2010.09.006

[4] Graziani A. And Boldini D. “Remarks on axisymmetric modeling of deep tunnels in argillaceous formations”, Tunnelling and Underground Space Technology, (2012) 28, 70–79. https://doi.org/10.1016/j.tust.2011.09.006

[5] Ng C. W. W, Hong Y, Liu G. B, and Liu T. “Ground deformations and soil-structure interaction of a multi-propped excavation in Shanghai soft clays”, Géotechnique, (2012) 62, no. 10, 907–921. https://doi.org/10.1680/geot.10.p.072

[6] Lisjak A, Garitte B, and Grasselli G. “The excavation of a circular tunnel in a bedded argillaceous rock (Opalinus Clay): short-term rock mass response and FDEM numerical analysis”, Tunnelling and Underground Space Technology, (2012) 45, 227–248. https://doi.org/10.1016/j.tust.2014.09.014

[7] Assallay A. M, Rogers C. D. F,and Smalley I. J. “Formation and collapse of metastable particle packings and open structures in loess deposits”, Engineering Geology, (1997) 48, no. 1-2, 101–115. https://doi.org/10.1016/s0013-7952(97)81916-3

[8] Vietor A. M, Rogers C. D. F, and Smalley I. J. “Formation and collapse of metastable particle packings and open structures in loess deposits”, Engineering Geology, (1997) 48, no. 1-2, 101–115. https://doi.org/10.1016/s0013-7952(97)81916-3

[9] Li, G, He, M. & Bai, Y. “ The influence of the heterogeneity of rock mass for surrounding rock stability evaluation of a tunnel” ,Bull Eng Geol Environ 82, 144 (2023). DOI: 10.1007/s10064-023-03145-z

[10] Liu, Wanrong, Peng, Chao, Zhang, Baoliang. “Study on Influence of Joint Distribution on Surrounding Rock Failure of an Underground Tunnel” , Geofluids, 2021, 3621040, 12 pages, 2021. DOI: 10.1155/2021/3621040

[11] Jia J, Xi B, Wang X, Tenorio VO, Liu Z. “A Study on Deformation Characteristics and Stability of Soft Surrounding Rock for a Shallow-Buried Tunnel”, Applied Sciences, 2024; 14(14):6014. DOI: 10.3390/app14146014

[12] Shao Shuai, Shao Shengjun, Li Jun, Qiu Bing. “An Analysis of Loess Tunnel Failure and Its Mechanism”, Advances in Civil Engineering, 2021, 6671666, 18 pages, 2021. DOI: 10.1155/2021/6671666