Abstract
One of the most substantial issues faced during the excavation of deep tunnels in weak geomechanical conditions is the squeezing phenomenon. Thrust force determination of the shielded tunnel boring machines (TBMs) in such conditions is of utmost importance. In this study, the Beheshtabad water conveyance tunnel in the central part of Iran is chosen as a case study. The creep parameters of Burger’s model (CVISC) are determined using laboratory creep tests on samples from the 19th zone of the tunnel with high squeezing potential, and the results were verified using finite difference simulation of the test. A new approach based on the convergence-confinement method is used to calculate the required thrust force of a double-shield TBM using radial displacement profile (RDP) and ground reaction curve (GRC). The effect of various penetration rates on thrust reduction as well as the impact of different over-boring values and standstill times has been evaluated. The results show that in small values of over-boring, due to high overburden pressure and weak geomechanical conditions, required thrust values are incredibly high and the increment of penetration rate is almost ineffective, and the negative effect of standstill time is more evident. Higher penetration rates have a significant impact on thrust reduction in all cases which is a noticeable factor to avoid TBM jamming under squeezing conditions. In higher over-boring values, thrust reduction is positively conducted through increasing the penetration rate and the negative effect of standstill time is minor.
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Conceptualization: Saeed Mahdevari. Methodology: Saeed Mahdevari and Danial Mohammadzamani. Formal analysis and investigation: Danial Mohammadzamani. Writing—original draft preparation: Danial Mohammadzamani and Armin Matindoust. Writing—review and editing: Danial Mohammadzamani and Armin Matindoust. Supervision: Saeed Mahdevari.
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Mohammadzamani, D., Mahdevari, S. & Matindoust, A. A new approach to evaluate the effect of over-boring and standstill time on thrust force of shielded TBMs based on penetration rate under squeezing conditions. Arab J Geosci 17, 75 (2024). https://doi.org/10.1007/s12517-024-11878-8
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DOI: https://doi.org/10.1007/s12517-024-11878-8