| 基于变形稳定时间统计的挤压性围岩隧道二次衬砌施作时机研究 |
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| 引用本文： | 李雷,朱超,刘志春,安志飞,李宁.基于变形稳定时间统计的挤压性围岩隧道二次衬砌施作时机研究[J].隧道建设,2023,43(1):17-26. |
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| 作者姓名： | 李雷 朱超 刘志春 安志飞 李宁 |
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| 作者单位： | （1. 中铁第一勘察设计院集团有限公司, 陕西 西安 710043； 2. 石家庄铁道大学 省部共建交通工程结构力学行为与系统安全国家重点实验室， 河北 石家庄 050043； 3. 道路与铁道工程安全保障省部共建教育部重点实验室（石家庄铁道大学）， 河北 石家庄 050043； 4.
中国铁路设计集团有限公司，
天津 300143） |
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| 摘 要： | 为获取挤压性围岩隧道二次衬砌施作时间，使二次衬砌施作可操作性更强，以变形速率限值为基础，对412个挤压性围岩隧道断面变形量测数据进行拟合和统计分析，得出不同变形等级的变形稳定时间范围值和施工期分阶段二次衬砌施作时机预测方法。具体结论为： 1)提出了基于变形速率判据的变形稳定时间预测方法，通过最优指数函数曲线拟合，实现稳定阶段变形量u稳和最终稳定时间t′稳的预测； 2)通过统计分析，确定了不同变形等级、不同跨度条件下变形稳定时间t′稳范围值，用于设计阶段初步拟定二次衬砌施作时机； 3)提出了施工期二次衬砌施作时机分阶段预测方法，根据实测20、30、40 d和稳定时的相对变形，可实现分阶段预测最终变形稳定时间； 4)经实测变形数据检验，采用二次衬砌施作时机分阶段预测方法所得预测结果可被工程所接受； 5)以分阶段变形稳定时间t′稳为判别指标的挤压性围岩隧道二次衬砌施作时机预测方法，可操作性强，能避免以变形速率为判别指标时的操作困扰，可直接服务于工程实践。
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Construction Timing of Tunnel Secondary Lining in
Squeezing RocksBased
on Statistics of Deformation Stabilization Time |
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| LI Lei,ZHU Chao,LIU Zhichun,AN Zhifei,LI Ning.Construction Timing of Tunnel Secondary Lining in
Squeezing RocksBased
on Statistics of Deformation Stabilization Time[J].Tunnel Construction,2023,43(1):17-26. |
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| Authors: | LI Lei ZHU Chao LIU Zhichun AN Zhifei LI Ning |
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| Institution: | (1. China Railway First Survey and Design Institute
Group Co., Ltd., Xi′an 710043, Shaanxi, China; 2. State Key Laboratory of Mechanical Behavior and
System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043,
Hebei, China; 3. Key Laboratory of Roads and Railway Engineering Safety Control (Shijiazhuang
Tiedao University) , Ministry of Education, Shijiazhuang
050043, Hebei, China; 4. China Railway Design Corporation, Tianjin 300143,
China) |
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| Abstract: | To determine
the construction timing of secondary lining in a squeezing rock tunnel and to
operate the secondary lining construction flexibly, the deformation measurement
data of 412 squeezing rock tunnel cross -sections are fitted and
statistically analyzed based on the deformation rate limit. Consequently, the
deformation stabilization time range of various deformation levels and the
prediction method of construction timing of staged secondary lining are
obtained. Some specific conclusions are drawn as follows: (1) A prediction
method of deformation stabilization time based on deformation rate is proposed;
a prediction method of deformation amountus and final stabilization time WT《TNR#I》]tWT《TNR》]′s in a stable stage is obtained by
fitting the optimal exponential function curve. (2) The range of deformation
stabilization time WT《TNR#I》]tWT《TNR》]′s under
various deformation levels and spans is determined through statistical
analysis, which can be used to preliminarily determine the construction timing
of secondary lining in the design stage. (3) A phased prediction method for the
construction timing of secondary lining during construction is proposed; the
final deformation stabilization time can be predicted by stages according to
the measured relative deformation at 20, 30, and 40 days and stable time. (4)
The measured deformation data validate the feasibility of the proposed phased
prediction method. (5) The proposed phased prediction method avoids operation
trouble by considering the deformation rate as the judgment index and can be
directly used in engineering practice. |
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| Keywords: | squeezing rock railway tunnel construction timing of secondary lining deformation classification deformation stabilization time |
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