Study on the Deformation Characteristics of Different Excavation Methods for Class V Perimeter Rock Tunnels

Authors

  • Chengzhi Qin

DOI:

https://doi.org/10.54097/8d7gjf96

Keywords:

Numerical simulation; Excavation method; Envelope deformation; CD method; Soft rock tunnels.

Abstract

Taking a water conservancy project water transfer tunnel as an example, FLAC3D finite element simulation software was used to simulate the excavation and support, and the displacement and distribution of the plastic zone of the tunnel perimeter rock were taken as the analytical indexes, and the simulation of the three excavation methods, namely, the full section method, the half section method and the CD method, was carried out to compare, and to study the characteristics of the deformation of the perimeter rock of the different methods of excavation. The simulation results show that: ① the vertical deformation of the three excavation methods all show that the bottom bulge is larger than the settlement of the vault; ② the full-face method is easy to produce shear damage at the vault, the step method is easy to produce shear damage at the waist of the tunnel, and there is no obvious damage characteristics of the CD method; ③ the CD diaphragm wall method is able to control the vertical deformation of the surrounding rock effectively, and the horizontal displacement will be increased, and joint support measures should be taken at the waist of the tunnel to strengthen the support.

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References

Penghua Li. Discussion on the application of CD method in tunnel excavation of soft and weak surrounding rock [J]. Science and Technology Innovation Herald,2019,16(14): 37-38. DOI:10.16660/j.cnki.1674-098X.2019.14.037.

Zhengbing Xi, Cang JIAO, Lianshan Wang et al. Analysis of deformation mechanism of weak surrounding rock caused by different working methods in super large section tunnel[J]. Construction Technology, 2006, (S1):50-51+68.

Dan Su, Ming Meng. Analysis of deformation of excavation and support of water tunnel in loess surrounding rock[J]. Water Resources Technical Supervision, 2023, (08): 215-219.

Xiangqun LI, Ning Wang, Zongxiao LI. Numerical simulation analysis of excavation deformation in a tunnel[J]. Journal of Jilin University of Architecture, 2022, 39(03): 31-34.

Xiaolong Guo, Zhongsheng Tan ,Yu Yu. Study on large deformation control technology and deformation control benchmark for soft rock tunnel of Chenglan Railway [J]. Journal of Railway, 2022, 44 (03): 86-104.

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Published

26-02-2024

Issue

Section

Articles

How to Cite

Study on the Deformation Characteristics of Different Excavation Methods for Class V Perimeter Rock Tunnels. (2024). Academic Journal of Science and Technology, 9(2), 266-270. https://doi.org/10.54097/8d7gjf96

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