Stress Field Distribution and Deformation Law of Large Deformation Tunnel Excavation in Soft Rock Mass
Source abstract
Abstract
The problem of large deformation is very prominent in deep-buried tunnel excavation in soft rock, which brings serious potential safety hazards and economic losses to projects. Knowledge of the stress field distribution and deformation law is the key to ensuring rational design and safe construction in large deformation tunnels of soft rock. As described in this paper, theoretical analysis, numerical simulation and field monitoring were employed to investigate the surrounding rock stress and displacement state in the Dongsong hydropower station in Sichuan Province, China. The results show that the short-bench construction method can effectively control the deformation of surrounding rock and range of the plastic zone. In order to reserve enough working space, the optimum bench length in the actual construction was 10 to 14 m. The peripheral displacement and plastic radius decreased with the increase of tunnel support strength and the advance of supporting time. The displacement can be effectively controlled by applying the second lining in time at a position about twice the diameter of the hole (16 m) from the working face. A reasonable reserved deformation should be adopted to avoid secondary expanding excavation. The values of different positions in the tunnel laterally and longitudinally may be different, and adjustments are needed according to the actual situation.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Geotechnical Engineering and Analysis · Landslides and related hazards · Rock Mechanics and Modeling
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China
School of Civil Engineering, Changsha University of Science and Technology, Changsha 410076, China
Guangxi Communication Investment Group CO., LTD, Nanning 530022, China
China 19th Metallurgical Corporation, Chengdu 611730, China
References (48)
Show source-provided references
1. Analytical solution for longitudinal seismic response of tunnel liners with sharp stiffness transition10.1016/j.tust.2018.04.001 ↗
2. Mechanical responses of existing tunnel due to new tunnelling below without clearance10.1016/j.tust.2018.06.001 ↗
3. Multi-point shaking table test for long tunnels subjected to non-uniform seismic loadings—Part I: Theory and validation10.1016/j.soildyn.2016.08.017 ↗
4. Multi-point shaking table test for long tunnels subjected to non-uniform seismic loadings—Part II: Application to the HZM immersed tunnel10.1016/j.soildyn.2016.08.018 ↗
5. Natural wind utilization in the vertical shaft of a super-long highway tunnel and its energy saving effect10.1016/j.buildenv.2018.08.062 ↗
6. Zhang, H., Chen, L., Chen, S., Sun, J., and Yang, J. (2018). The spatiotemporal distribution law of microseismic events and rockburst characteristics of the deeply buried tunnel group. Energies, 11.10.3390/en11123257 ↗
7. Analytical solution for longitudinal bending stiffness of shield tunnels10.1016/j.tust.2018.09.011 ↗
8. Analytical solution for a finite Euler-Bernoulli beam with single discontinuity in section under arbitrary dynamic loads10.1016/j.apm.2018.03.046 ↗
9. Multi-point shaking table test of a long tunnel subjected to non-uniform seismic loadings10.1007/s10518-017-0223-6 ↗
10. Study on failure mechanism of roadway with soft rock in deep coal mine and confined concrete support system10.1016/j.engfailanal.2017.08.003 ↗
11. Experimental investigations on deformation of soft rock during cutting10.1016/j.ijrmms.2018.03.003 ↗
12. A finite strain numerical procedure for a circular tunnel in strain–softening rock mass with large deformation10.1016/j.ijrmms.2018.10.016 ↗
13. Failure mechanism and supporting measures for large deformation of Tertiary deep soft rock10.1016/j.ijmst.2014.11.002 ↗
14. Development and verification of large deformation model considering stiffness deterioration and shear dilation effect in FLAC3D10.1016/j.ijmst.2018.06.008 ↗
15. Time and technique of rehabilitation for large deformation of tunnels in jointed rock masses based on FDM and DEM numerical modeling10.1016/j.tust.2018.08.036 ↗
16. Stability of NATM tunnel faces in soft surrounding rocks10.1016/j.compgeo.2017.10.009 ↗
17. Zhang, Z.Q., Li, H.Y., Yang, H.Y., and Wang, B. (2018). Failure modes and face instability of shallow tunnels under soft grounds. Int. J. Damage Mech., in press.10.1177/1056789518773135 ↗
18. Fiber bragg grating sensors-based in situ monitoring and safety assessment of loess tunnel10.1155/2016/8658290 ↗
19. Investigation of mechanism of floor heave of roadway
20. Conception system and evaluation indexes for deep engineering
21. Study of rock mechanics in deep mining engineering
22. Latest progress of soft rock mechanics and engineering in China10.1016/j.jrmge.2014.04.005 ↗
23. Research on large deformation mechanism and control method of deep soft roadway in Zhuji coal mine
24. Failure mechanism and stability control of a large section of very soft roadway surrounding rock shear slip10.1016/j.ijmst.2013.03.002 ↗
25. Dynamic constitutive model for deformation and fracture of deep rock mass
26. Rock deformation tests to large shear strains in torsion10.1016/S0191-8141(00)00042-0 ↗
27. Roadway deformation during riding mining in soft rock10.1016/j.ijmst.2012.01.017 ↗
28. Analysis of mechanical behavior of soft rocks and stability control in deep tunnels10.1016/j.jrmge.2014.03.003 ↗
29. Study on stability of deep rock roadways in coal mines and their support measures
30. The squeezing potential of rocks around tunnels: Theory and prediction10.1007/BF01023620 ↗
31. Big tunnels in bad rock10.1061/(ASCE)1090-0241(2001)127:9(726) ↗
32. Countermeasures aiming at the support for crossing roadway of deeply buried soft rocks in Xing an coal mine
33. Design and construction aspects of deep tunnels (with Particular Emphasis on Strain Softening Rocks)10.1016/S0886-7798(01)00008-6 ↗
34. Terzaghi, K. (1946). Rock Defects and Loads on Tunnel Supports, Harvard University, Graduate School of Engineering.
35. Squeezing rocks in tunnel
36. Swelling rocks and stability of tunnels
37. A model for swelling rock in tunneling10.1007/BF01027115 ↗
38. Support pressure assessment in arched underground openings through poor rock masses10.1016/S0013-7952(97)81914-X ↗
39. Theoretical estimation of loosening pressure on tunnels in soft rocks10.1016/S0886-7798(01)00034-7 ↗
40. A case study on large deformation failure mechanism of deep soft rock roadway in Xin’An coal mine, China10.1016/j.enggeo.2016.12.012 ↗
41. Research on the deformation rule of weak rock mass tunnel under high initial geostress
42. Jiang, Y. (2004). The Study on the Forecast and Countermeasure of Great Distortion of Highway Tunnel Wall Rock. [Ph.D. Thesis, Chengdu University of Technology].
43. Squeezing rock conditions at an igneous contact zone in the Taloun tunnels, Tehran–Shomal freeway, Iran: A case study10.1016/j.ijrmms.2004.07.002 ↗
44. Displacement analysis of tunnel support in soft rock around a shallow highway tunnel at Golovec10.1016/j.enggeo.2004.05.003 ↗
45. Control technology for large deformation of Mesozoic compound soft rock in XinJiang and its application
46. Chen, S.G., Yang, J.S., and Chen, L. (2014). Deformation Characteristics and Construction Strategies of Soft Rock Tunnel, China Communications Press. [1st ed.].
47. Guan, B.S. (1993). Introduction to Tunnel Mechanics, Southwest Jiaotong University Press. [1st ed.].
48. Applying Bayesian approach to predict deformations during tunnel construction10.1002/nag.2810 ↗