[1]陈军浩,李彧翰,张见,等.地铁盾构始发端垂直分段冻结加固多场演化规律[J].福建理工大学学报,2025,23(01):40-47.[doi:10.3969/j.issn.2097-3853.2025.01.003]
　CHEN Junhao,LI Yuhan,ZHANG Jian,et al.Multi-field evolution of vertical segmental freezing reinforcement at starting end of subway shield[J].Journal of Fujian University of Technology;,2025,23(01):40-47.[doi:10.3969/j.issn.2097-3853.2025.01.003]
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地铁盾构始发端垂直分段冻结加固多场演化规律
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《福建理工大学学报》[ISSN:2097-3853/CN:35-1351/Z]

卷:
第23卷
期数:
2025年01期
页码:
40-47
栏目:
出版日期:
2025-02-26

文章信息/Info

Title:
Multi-field evolution of vertical segmental freezing reinforcement at starting end of subway shield
作者:
陈军浩; 李彧翰; 张见; 黄靖涵
福建理工大学土木工程学院
Author(s):
CHEN Junhao;  LI Yuhan;  ZHANG Jian;  HUANG Jinghan
School of Civil Engineering, Fujian University of Technology
关键词:
分段冻结; 盾构端头加固; 冻结温度场; 位移场
Keywords:
segmental freezing;  shield end reinforcement;  freezing temperature field;  displacement field
分类号:
U455
DOI:
10.3969/j.issn.2097-3853.2025.01.003
文献标志码:
A
摘要:
以福州地铁6 号线某区间盾构始发端垂直分段冻结加固为背景,分析了分段与全段冻结对温度场的影响,通过地表位移探究了分段冻结过程中冻胀作用对周边环境的影响。采用有限元软件建立分段与全段冻结数值模型,动态模拟冻结帷幕的演化过程,并将分段冻结与全段冻结数值模拟计算结果与现场实测数据进行对比验证,结果表明:积极冻结期间,在相同温度发展路径上,越靠近冻结中心区域,冻结效果越好;冻结管端头处的冻结效果比中心区域略差,冻结管底部冻结效果最差,为冻结薄弱区域;积极冻结期结束后,隧道顶部的冻结帷幕厚度达到4 m,隧道底部的帷幕厚度达到3.5 m,均满足设计值。分段冻结帷幕形成时间比全段冻结短,分段冻结的地表隆起量为24.4 mm,低于全段冻结的27.6 mm,因此分段冻结的冻结效果略优于全段冻结。研究结果可为垂直冻结法加固盾构端头的冻结方案设计与冻结法施工提供参考。
Abstract:
Based on the vertical segmental freezing reinforcement of the shield’s starting end of a section of Fuzhou Metro Line 6, the influence of segmental and full-section freezing on the temperature field was analyzed, and the influence of frost heaving on the surrounding environment during the segmental freezing process was explored through the surface displacement. The finite element software was used to establish the numerical model of segmented and full-section freezing, and the evolution process of frozen curtain was dynamically simulated. The numerical simulation results of segmented freezing and full-section freezing were compared with the field measured data. Findings indicate that during the active freezing phase, the freezing effectiveness improves with proximity to the freezing center along the same temperature development path. The freezing efficiency is least effective at the end of the freezing tube, with the bottom of the tube exhibiting the poorest performance, identifying it as a weak freezing zone. Following the active freezing period, the thickness of the freezing curtain at the tunnel crown reaches 4 m, while at the invert, it attains 3.5 m, fulfilling the design specifications. The time required for the freeze curtain to form is shorter in segmental freezing than that in whole-section freezing. Additionally, the surface uplift in segmental freezing is measured as 24.4 mm, which is less than that observed in whole-section freezing, i.e., 27.6 mm, suggesting that segmental freezing is marginally more effective. These research results serve as a valuable reference for the design and execution of freezing schemes for shield end reinforcement utilizing the vertical freezing method.

参考文献/References:

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更新日期/Last Update: 2025-02-25