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| Evaluation Method for TBM Adaptability of Extra Long Tunnels |
| GUO Limin |
| China Railway First Survey and Design Institute Group Co. Ltd, Xi'an, Shaanxi 710043, China |
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Abstract Research purposes: Through the investigation of existing TBM construction cases at home and abroad, combined with the development of TBM equipment and the improvement of construction level in recent years, the measures taken by open TBM to deal with various adverse geological problems were analyzed and studied, and the adverse geological engineering measures of TBM to deal with extremely hard rock, rock burst, large deformation of soft rock, fault fracture zone, water inrush and auxiliary tunnel conditions and the adaptability of TBM were evaluated, and a quantitative evaluation method for TBM adaptability was proposed.
Research conclusions: (1)Through the analysis of the case, the adaptability evaluation of TBM through extremely hard rock, rock burst, large deformation of soft rock, fault fracture zone, water and mud inflow and other adverse geology is obtained.(2)Combined with the investigation and analysis of the existing special tunnel auxiliary tunnel scheme, the auxiliary tunnel condition coefficient is proposed, and the auxiliary tunnel conditions are quantitatively evaluated.(3)The evaluation coefficients of TBM adaptability are quantified under various types of adverse geological conditions.(4)Combined with the auxiliary tunnel conditions and the adaptability of adverse geological TBM, the TBM selection principle is proposed, and the existing TBM tunnel project is evaluated, showing that the TBM selection principle has good applicability.(5)The research results can be applied to the adaptability evaluation of TBM construction method for super long tunnels in mountainous areas.
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Received: 11 October 2023
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2023, Vol. 40 
