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A platform for research: civil engineering, architecture and urbanism
Method for controlling deformation of vertical excavation unloading segment structure of shield tunnel
The invention relates to a shield tunnel vertical excavation unloading segment structure deformation control method comprising the following steps: establishing a numerical model, and carrying out assignment analysis calculation according to the numerical model; obtaining a duct piece floating deformation and internal stress change rule under the conditions of different stratums around the formed tunnel and the excavation modes of different segment lengths and different layering thicknesses of the foundation pit; tunnel reinforcement measures are carried out, specifically, grouting is carried out on the surrounding stratum of the tunnel, segments are pulled into a whole in the length direction of the tunnel, reverse pressure compensation is carried out on the tunnel, and parameters of all the tunnel reinforcement measures are comprehensively determined according to the floating deformation of the segments and the internal stress change rule; the foundation pit is excavated in a segmented and layered mode above the tunnel, tunnel deformation and foundation pit deformation are monitored in the excavation process, and the excavation mode of the foundation pit and/or parameters of all tunnel reinforcement measures are adjusted according to the monitoring result. By means of the control method, it is guaranteed that when the foundation pit is excavated, the problems of floating deformation, slab staggering, damage over-limit and the like of the duct piece are avoided.
本发明涉及一种盾构隧道竖向开挖卸载管片结构变形的控制方法，包括步骤：建立数值模型，并根据数值模型进行赋值分析计算，得出已成型隧道周围不同地层条件下、基坑不同分段长度与不同分层厚度开挖方式下的管片上浮变形与内应力变化规律；实施隧道加固措施，包括向隧道周围地层进行注浆、沿隧道长度方向将管片拉结形成整体、对隧道进行反压重补偿，其中，各隧道加固措施的参数根据管片上浮变形与内应力变化规律综合确定；在隧道上方对基坑分段、分层开挖，且在开挖过程中对隧道变形与基坑变形进行监测，根据监测结果调整基坑开挖方式和/或各隧道加固措施的参数。该控制方法保证了在基坑开挖时，管片不会发生上浮变形、错台与破损超限等问题。
Method for controlling deformation of vertical excavation unloading segment structure of shield tunnel
The invention relates to a shield tunnel vertical excavation unloading segment structure deformation control method comprising the following steps: establishing a numerical model, and carrying out assignment analysis calculation according to the numerical model; obtaining a duct piece floating deformation and internal stress change rule under the conditions of different stratums around the formed tunnel and the excavation modes of different segment lengths and different layering thicknesses of the foundation pit; tunnel reinforcement measures are carried out, specifically, grouting is carried out on the surrounding stratum of the tunnel, segments are pulled into a whole in the length direction of the tunnel, reverse pressure compensation is carried out on the tunnel, and parameters of all the tunnel reinforcement measures are comprehensively determined according to the floating deformation of the segments and the internal stress change rule; the foundation pit is excavated in a segmented and layered mode above the tunnel, tunnel deformation and foundation pit deformation are monitored in the excavation process, and the excavation mode of the foundation pit and/or parameters of all tunnel reinforcement measures are adjusted according to the monitoring result. By means of the control method, it is guaranteed that when the foundation pit is excavated, the problems of floating deformation, slab staggering, damage over-limit and the like of the duct piece are avoided.
本发明涉及一种盾构隧道竖向开挖卸载管片结构变形的控制方法，包括步骤：建立数值模型，并根据数值模型进行赋值分析计算，得出已成型隧道周围不同地层条件下、基坑不同分段长度与不同分层厚度开挖方式下的管片上浮变形与内应力变化规律；实施隧道加固措施，包括向隧道周围地层进行注浆、沿隧道长度方向将管片拉结形成整体、对隧道进行反压重补偿，其中，各隧道加固措施的参数根据管片上浮变形与内应力变化规律综合确定；在隧道上方对基坑分段、分层开挖，且在开挖过程中对隧道变形与基坑变形进行监测，根据监测结果调整基坑开挖方式和/或各隧道加固措施的参数。该控制方法保证了在基坑开挖时，管片不会发生上浮变形、错台与破损超限等问题。
Method for controlling deformation of vertical excavation unloading segment structure of shield tunnel
盾构隧道竖向开挖卸载管片结构变形的控制方法
LEI BENJIAN (author) / QU ZHAOLEI (author) / SUN GUOAN (author) / YIN HAITAO (author) / SUN XIAOFENG (author)
2023-03-07
Patent
Electronic Resource
Chinese
IPC:
E21F
Sicherheitsvorrichtungen, Förderung, Auffüllen oder Bergversatz, Rettungswesen, Bewetterung oder Entwässerung in oder von Gruben oder Tunnels
,
SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINAGE IN OR OF MINES OR TUNNELS
/
E02D
FOUNDATIONS
,
Gründungen
/
E21D
SHAFTS
,
Schächte
/
G06F
ELECTRIC DIGITAL DATA PROCESSING
,
Elektrische digitale Datenverarbeitung
The Effect of Excavation Unloading on the Deformation of Existing Underlying Shield Tunnel
| Springer Verlag | 2021
| British Library Online Contents | 2016