Experimental Study of the Reinforcement Mechanism for the Tunnel Support Structure in Weak Rock Masses
Publication: International Journal of Geomechanics
Volume 23, Issue 10
Abstract
This study aims to comprehensively investigate the reinforcement mechanism of the tunnel support structure and its supporting characteristics in layered and weak rock tunnels. Uniaxial compressive tests were carried out to study the mechanical and deformation characteristics of anchored rock with the system anchor bolt and the steel floral pipe. Besides, a three-point bending test of the steel–concrete composite beam was conducted to investigate the bending capacity of the grilles and I-beams. The experiment showed the following results: (1) The anchor bolt achieved the anchoring effect by improving the stress state and the strength of the surrounding rock. The improvement of the anchorage strength to the surrounding rock was reflected by the effect of the compression zone of preload, the healing effect of the anchorage agent on the surrounding rock, and the reinforcement effect of the anchor bolt on the density and strength of the anchor bolt. (2) By the CT scanning of the anchored samples after the experiment, it was found that the crack was blunted and arrested within the anchorage zone, and the crack-arresting effect was related to the range of the anchorage zone. The larger the anchorage zones, the better the crack-arresting effect. (3) The steel arch could effectively improve the ability of concrete antideformation. Compared with the lattice girder, the coordination ability of steel arch and concrete deformation was relatively weak. Its coordinate deformation stage was shorter than that of the lattice girder and earlier into the debonding stage. However, the stiffness of the steel arch and concrete was greater than that of the lattice girder after debonding and showed a strong bearing capacity.
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Data Availability Statement
The data sets used and analyzed during the current study are available from the corresponding author upon reasonable request.
Acknowledgments
This study was financially supported by the National Natural Science Foundation of China (52009131).
References
Batugin, A., Z. Wang, Z. Su, and S. S. Sidikovna. 2021. “Combined support mechanism of rock bolts and anchor cables for adjacent roadways in the external staggered split-level panel layout.” Int. J. Coal Sci. Technol. 8 (4): 659–673. https://doi.org/10.1007/s40789-020-00399-w.
Boon, C. W. 2019. “Study of reinforcement support mechanisms for wide-span horse-shoe-shaped openings in horizontally layered jointed rock using the distinct element method.” Rock Mech. Rock Eng. 52 (4): 1179–1191. https://doi.org/10.1007/s00603-018-1615-x.
Boon, C. W., G. T. Houlsby, and S. Utili. 2015. “Designing tunnel support in jointed rock masses via the DEM.” Rock Mech. Rock Eng. 48 (2): 603–632. https://doi.org/10.1007/s00603-014-0579-8.
Cai, Y., Y. Jiang, I. Djamaluddin, T. Iura, and T. Esaki. 2015. “An analytical model considering interaction behavior of grouted rock bolts for convergence-confinement method in tunneling design.” Int. J. Rock Mech. Min. Sci. 76: 112–126. https://doi.org/10.1016/j.ijrmms.2015.03.006.
Chen, J., P. C. Hagan, and S. Saydam. 2021a. “An experimental study of the specimen geometry effect on the axial performance of cement-based grouts.” Constr. Build. Mater. 310: 125167. https://doi.org/10.1016/j.conbuildmat.2021.125167.
Chen, J., and D. Li. 2022. “Numerical simulation of fully encapsulated rock bolts with a tri-linear constitutive relation.” Tunnelling Underground Space Technol. 120: 104265. https://doi.org/10.1016/j.tust.2021.104265.
Chen, J., P. Liu, L. Liu, B. Zeng, H. Zhao, C. Zhang, J. Zhang, and D. Li. 2022. “Anchorage performance of a modified cable anchor subjected to different joint opening conditions.” Constr. Build. Mater. 336: 127558. https://doi.org/10.1016/j.conbuildmat.2022.127558.
Chen, J., P. Liu, H. Zhao, C. Zhang, and J. Zhang. 2021b. “Analytical studying the axial performance of fully encapsulated rock bolts.” Eng. Fail. Anal. 128: 105580. https://doi.org/10.1016/j.engfailanal.2021.105580.
Chen, J., H. Zhao, F. He, J. Zhang, and K. Tao. 2021c. “Studying the performance of fully encapsulated rock bolts with modified structural elements.” Int. J. Coal Sci. Technol. 8 (1): 64–76. https://doi.org/10.1007/s40789-020-00388-z.
Chen, Y., J. Teng, R. A. Bin Sadiq, and K. Zhang. 2020. “Experimental study of bolt anchoring mechanism for bedded rock mass.” Int. J. Geomech. 20 (4): 04020019. https://doi.org/10.1061/(ASCE)GM.1943-5622.0001561.
Liu, W., Q. Feng, S. Fu, and C. Wang. 2018. “Elasto-plastic solution for cold-regional tunnels considering the compound effect of non-uniform frost heave, supporting strength and supporting time.” Tunnelling Underground Space Technol. 82: 293–302. https://doi.org/10.1016/j.tust.2018.08.054.
Tahmasebinia, F., C. Zhang, C. Wei, I. Canbulat, S. Saydam, and S. Sepasgozar. 2021. “A new concept to design combined support under dynamic loading using numerical modelling.” Tunnelling Underground Space Technol. 117 (August): 104132. https://doi.org/10.1016/j.tust.2021.104132.
Tang, S. B. 2015. “The effect of T-stress on the fracture of brittle rock under compression.” Int. J. Rock Mech. Min. Sci. 79: 86–98. https://doi.org/10.1016/j.ijrmms.2015.06.009.
Tang, S. B. 2017. “Stress intensity factors for a Brazilian disc with a central crack subjected to compression.” Int. J. Rock Mech. Min. Sci. 93 (May 2016): 38–45. https://doi.org/10.1016/j.ijrmms.2017.01.003.
Tang, S. B., C. Y. Bao, and H. Y. Liu. 2017. “Brittle fracture of rock under combined tensile and compressive loading conditions.” Can. Geotech. J. 54 (1): 88–101. https://doi.org/10.1139/cgj-2016-0214.
Tang, S. B., C. Y. Yu, M. J. Heap, P. Z. Chen, and Y. G. Ren. 2018a. “The influence of water saturation on the short- and long-term mechanical behavior of red sandstone.” Rock Mech. Rock Eng. 51 (9): 2669–2687. https://doi.org/10.1007/s00603-018-1492-3.
Tang, S. B., C. Y. Yu, and C. Tang. 2018b. “Numerical modeling of the time-dependent development of the damage zone around a tunnel under high humidity conditions.” Tunnelling Underground Space Technol. 76: 48–63. https://doi.org/10.1016/j.tust.2018.03.012.
Wang, Q., Q. Qin, B. Jiang, H. C. Yu, R. Pan, and S. C. Li. 2019. “Study and engineering application on the bolt-grouting reinforcement effect in underground engineering with fractured surrounding rock.” Tunnelling Underground Space Technol. 84: 237–247. https://doi.org/10.1016/j.tust.2018.11.028.
Wu, X., Y. Jiang, Z. Guan, and G. Wang. 2018. “Estimating the support effect of energy-absorbing rock bolts based on the mechanical work transfer ability.” Int. J. Rock Mech. Min. Sci. 103: 168–178. https://doi.org/10.1016/j.ijrmms.2018.01.041.
Wu, X., Y. Jiang, G. Wang, B. Gong, Z. Guan, and T. Deng. 2019. “Performance of a new yielding rock bolt under pull and shear loading conditions.” Rock Mech. Rock Eng. 52 (9): 3401–3412. https://doi.org/10.1007/s00603-019-01779-8.
Yokota, Y., Z. Zhao, J. Shang, W. Nie, K. Date, K. Iwano, and Y. Okada. 2019. “Effect of bolt configuration on the interface behaviour between a rock bolt and bond material: A comprehensive DDA investigation.” Comput. Geotech. 105: 116–128. https://doi.org/10.1016/j.compgeo.2018.09.017.
Zhang, Y., M. Wang, L. Yu, X. Guo, Z. Wang, and C. Li. 2022. “Experimental and numerical research on the influence of steel arch frame corrosion on security of supporting system in subsea tunnel.” Tunnelling Underground Space Technol. 120: 104253. https://doi.org/10.1016/j.tust.2021.104253.
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© 2023 American Society of Civil Engineers.
History
Received: Nov 30, 2022
Accepted: Apr 29, 2023
Published online: Jul 31, 2023
Published in print: Oct 1, 2023
Discussion open until: Dec 31, 2023
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