A Study on Deformation Characteristics and Stability of Soft Surrounding Rock for a Shallow-Buried Tunnel
Source abstract
Abstract
The Heimaguan Tunnel in China serves as a case study to exemplify the variation laws related to surface settlement, deformation, and stress characteristics in a shallow-buried soft-rock tunnel, while emphasizing in the tunnel support requirements. The first stage of this study begins with monitoring the time-varying characteristics of surface settlement, vault subsidence, and the horizontal convergence of Grade V rock. In the second stage, Peck theory is used to calculate the distribution characteristics of surface settlement. The results of both stages are compared to create a vault settlement model, thus establishing the horizontal convergence based on exponential function, logarithmic function and hyperbolic function, and determining the optimal time of secondary lining construction. On this basis, the time-dependent variation laws and characteristics of vertical and horizontal displacement and principal stress of surrounding rock are studied. After this, using simulation and analysis, the proper support is recommended. The study reveals that the surface settlement, vault subsidence, and horizontal convergence of the shallow-buried soft-rock tunnel stabilize within 25–30 days. Peck theory closely aligns with predictions based on exponential functions, with only a 0.72% difference. The recommended time for secondary lining application is 26–27 days.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Geotechnical Engineering and Analysis · Geotechnical Engineering and Underground Structures · Geotechnical Engineering and Soil Stabilization
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Traffic and Transportation, Lanzhou Jiaotong University, Lanzhou 730070, China
Department of Mining and Geological Engineering, University of Arizona, Tucson, AZ 85721, USA
China Merchants Chongqing Communications Technology Research and Design Institute Co., Ltd., Chongqing 400067, China
Funding
National Natural Science Foundation of China
References (30)
Show source-provided references
1. Study on response regularity of tunnel supporting structure characterized with soft-rock large deformation
2. Dimensionless parameter diagrams for the active and passive stability of a shallow 3d tunnel face10.1007/s12205-018-5835-0 ↗
3. Application of “three-section and four-step” safety treatment technology for tunnel collapse
4. Analysis on the law of ground settlement in shallow tunnel excavation in composite layered strata
5. Calculation method of surface settlement caused by tunnel construction in rock-soil composite stratum
6. Estimation method of ultimate deformation of soft rock tunnel based on Hoek-Brwon criterion
7. Determination of deformation law and stability criterion of tunnel surrounding rock in whole process based on field measured data
8. Analysis on spatial effect of excavation of large section soft rock tunnel
9. Studying the effect of some parameters on the stability of shallow tunnels10.1016/j.jsm.2018.02.001 ↗
10. Research on support structure optimization of soft rock Tunnel
11. The long-term safety of a deeply buried soft rock tunnel lining under inside-to-outside seepage conditions10.1016/j.tust.2017.05.004 ↗
12. Study on large deformation collapse mechanism and control measures for large section tunnel face in Badong formation mudstone
13. Method for calculating penetration range of grouting slurry in the reinforced tunnel by high-pressure rotary jet grouting from ground
14. Mechanical characteristics and force slow-release method of support structure of expansive soft rock tunnels
15. Stability analysis of tunnel supports under complex conditions
16. Large deformation mechanism of surrounding rock masses of tunnels, prediction method of squeezing large deformation and its application
17. Mechanisms of large deformation in soft rock tunnels: A case study of Huangjiazhai tunnel10.1007/s10064-017-1155-8 ↗
18. Study on model test and numerical simulation of layered soft rock tunnel construction with different large deformation grades
19. Dynamic prediction of surface settlement and analysis of influencing factors for tunnel excavation
20. Stability of NATM tunnel faces in soft surrounding rocks10.1016/j.compgeo.2017.10.009 ↗
21. Face stability of a tunnel excavated in saturated nonhomogeneous soils. Tunn10.1016/j.tust.2018.09.007 ↗
22. Stability of unlined square tunnels in Hoek-Brown rock masses based on lower bound analysis10.1016/j.compgeo.2018.10.006 ↗
23. Study on deformation characteristic curve and deformation mechanism of tunnel in XiGeDa stratum
24. Xia, C., Lu, G., Bai, D., Zhu, Z., Luo, S., and Zhang, G. (2020). Sensitivity Analyses of the Seepage and Stability of Layered Rock Slope Based on the Anisotropy of Hydraulic Conductivity: A Case Study in the Pulang Region of Southwestern China. Water, 12.10.3390/w12082314 ↗
25. Study on the construction time of secondary liningin phyllite tunnel under high geo-stress
26. (2020). Technical Specification for Construction of Highway Tunnel (Standard No. JTG/T3660-2020).
27. Investigation of rock mass stability around the tunnels in an underground mine in USA using three-dimensional numerical modeling10.1007/s00603-017-1336-6 ↗
28. Numerical analysis of tunneling in slates with anisotropic time-dependent behavior10.1016/j.tust.2018.11.025 ↗
29. Large deformation characteristics and treatment effect for deep bias tunnel in broken phyllite: A case study10.1016/j.engfailanal.2022.106045 ↗
30. Large deformation characteristics and controlling measures of steeply inclined and layered soft rock of tunnels in plate suture zones10.1016/j.engfailanal.2021.105831 ↗