基于围岩蠕变效应的盾构隧道下穿高铁隧道近接施工影响
王有旗1马国松1仇文革2,3黄海昀2张都2艾旭峰2
Adjacent Construction Impact of Shield Tunnel Undercrossing High-Speed Railway Tunnels Based on Surrounding Rock Creep Effect
WANG Youqi1MA Guosong1QIU Wenge2,3HUANG Haiyun2ZHANG Du2AI Xufeng2
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作者信息:1.中铁二十五局集团第五工程有限公司， 266100， 青岛
2.西南交通大学交通隧道工程教育部重点实验室， 610031， 成都
3.成都天佑智隧科技有限公司， 610031， 成都
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Affiliation:1.The 5th Engineering Co., Ltd., China Railway 25th Bureau Group, 266100, Qingdao, China
2.Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, 610031, Chengdu, China
3.Chengdu Tianyou Tunnelkey Co., Ltd., 610031, Chengdu, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.05.030
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中图分类号/CLCN:U455.43
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栏目/Col:土建工程
摘要:
［目的］当围岩具有蠕变特性时，盾构隧道下穿高铁隧道近接施工过程的时间因素不容忽视，近接施工的快慢会影响围岩的时效变形行为，进而影响高铁隧道的轨道沉降。因此，有必要研究围岩蠕变效应下，盾构隧道下穿高铁隧道近接施工过程的影响。［方法］以长沙轨道交通3号线盾构隧道下穿浏阳河隧道为例，基于Cvisc蠕变模型，采用FLAC 3D有限差分软件进行数值模拟，对比分析围岩在经典弹塑性和蠕变效应下的近接施工影响，分析时间相关因素——盾构隧道掘进速度对近接施工的影响。［结果及结论］泥质粉砂岩含水率的增加，会导致高铁轨道最终沉降变形增大，在进行蠕变效应分析时，需重视围岩的含水状态。考虑围岩蠕变效应后，高铁轨道的沉降变形在开挖过程中呈现出一定的滞后性，围岩蠕变效应有利于近接施工过程中的高铁轨道变形控制。随着盾构掘进速度的加快，高铁轨道沉降变形的滞后性越明显。在近接施工过程中，可充分利用围岩的蠕变效应，采取“快挖，快支护”，实现以“时间换空间”的目的，为后续轨道的沉降变形控制争取更多的安全裕量。
Abstracts:
［Objective］When the surrounding rock exhibits creep characteristics, the temporal factors in the adjacent construction process of shield tunnel undercrossing high-speed railway tunnels cannot be ignored. The speed of the adjacent construction may affect the time-dependent deformation behavior of the surrounding rock, thereby influencing the track settlement in the high-speed railway tunnels. Therefore, it is necessary to study the impact of adjacent construction of shield tunnel undercrossing the high-speed railway tunnels under the creep effect of the surrounding rock. ［Method］In the case study of Changsha Metro Line 3 shield tunnel undercrossing the Liuyanghe Tunnel, based on the Cvisc creep model, the FLAC 3D finite difference software is used for numerical simulation. The impacts of the adjacent construction on surrounding rock under the classical elastoplasticity and the creep effect are compared and analyzed, together with the time-related factor influence like the driving speed of shield tunneling on the adjacent construction. ［Result & Conclusion］Increased water content of argillaceous siltstone will lead to an increase in the final settlement deformation of high-speed railway tracks. So, the water content of the surrounding rock must be prioritized in creep effect analysis. Considering the creep effect of the surrounding rock and the time lag characteristics exhibited in the high-speed railway track settlement deformation during excavation, the creep effect of the surrounding rock may contribute positively to the deformation control in the above adjacent construction scenario. With the acceleration of the shield tunneling, the time lag becomes more obvious in the settlement deformation of the high-speed railway track. During adjacent construction, the creep effect of the surrounding rock can be fully utilized through "rapid excavation and prompt support" to achieve the goal of "trading time for space," thereby securing additional safety margins for the track post-construction settlement control.
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