近海复杂地层下城市轨道交通TBM选型优化与掘进参数控制
时健1刘卫景2张仕林1,2李锁在3孔德森1
TBM Selection Optimization and Tunneling Parameter Control in Complex Offshore Strata for Urban Rail Transit
SHI Jian1LIU Weijing2ZHANG Shilin1,2LI Suozai3KONG Desen1
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作者信息:1.山东科技大学土木工程与建筑学院， 266590， 青岛
2.青岛地铁集团有限公司， 266045， 青岛
3.中铁三局集团第四工程有限公司， 102300， 北京
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Affiliation:1.College of Civil Engineering and Architecture of Shandong University of Science and Technology, 266590, Qingdao, China
2.Qingdao Metro Group Co., Ltd., 266045, Qingdao, China
3.The Fourth Engineering Co., Ltd., China Railway No.3 Engineering Group Co., Ltd., 102300, Beijing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.03.008
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中图分类号/CLCN:U455.44∶U231
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栏目/Col:研究报告
摘要:
［目的］为提高TBM(隧道掘进机)的地层适应性，解决青岛地铁2号线(以下简称“2号线”)西延段近海复杂地层下TBM选型的难题，需对TBM选型进行优化，并对其掘进参数进行控制。［方法］通过地质条件适应性、施工灵活度及掘进效率等方面，对适宜硬岩掘进的TBM类型进行了综合比选。针对2号线TBM掘进区间存在的穿越断裂破碎带、始发空间不足、小曲率半径施工及不具备吊出条件等工程难点，对TBM进行了优化设计。确定了不同等级围岩下双护盾TBM的推力、扭矩、刀盘转速及净掘进速率等参数的取值范围。［结果及结论］经综合比选，2号线西延段近海复杂地层选用DSUC型双护盾TBM施工。该型TBM具有良好的地层适应性，支护方式灵活多样，通过优化刀盘、盾体及后配套台车设计，改进始发、拆解、小曲率半径施工方案，完善超前加固及导向系统，使TBM应用更加经济合理。双护盾TBM在中硬岩层中掘进时，可适当增加推力和扭矩，以提高净掘进速率；而通过断层破碎带时应严格控制掘进参数，以减少对掌子面的扰动。
Abstracts:
［Objective］ In order to improve the formation adaptability of the tunnel boring machine (shorten as TBM) and solve the problem of TBM selection for the west extension section of Qingdao Metro Line 2 (hereinafter referred to as Line 2) in the complex formation offshore, it is necessary to optimize TBM selection and control tunneling parameters. ［Method］ From the aspects of geological condition adaptability, construction flexibility and excavation efficiency, the TBM types are comprehensively compared and the one suitable for hard rock excavation is selected. In view of the engineering difficulties in the TBM tunneling section of Line 2, such as crossing fracture zone, insufficient starting space, small curvature radius construction and lack of lifting conditions, the TBM is optimized. The range of parameter values including thrust, torque, cutter speed and net tunneling rate of double-shield TBM under different grades of wall rock are determined. ［Result & Conclusion］ After comprehensive comparison, DSUC type double shield TBM is selected for the construction of Line 2 west extension section in complex offshore strata. This type of TBM has good formation adaptability and flexible support methods. By optimizing cutter head, shield body and back-up train design, improving the starting, disassembling and small curvature radius construction scheme, and improving the advance reinforcement and guidance system, TBM application becomes more economical and reasonable. When the TBM advances in the medium hard rock formation, the thrust and torque can be properly improved to increase the net tunneling rate. The tunneling parameters should be strictly controlled to reduce the disturbance to the palm surface when the TBM passes through fault fracture zone.
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