Construction Timing of Tunnel Secondary Lining in
Squeezing Rocks&nbsp;Based
on Statistics of Deformation Stabilization Time

LI Lei; ZHU Chao; LIU Zhichun; AN Zhifei; LI Ning

doi:10.3973/j.issn.2096-4498.2023.01.002

Tunnel Construction >

2023 , Vol. 43 >Issue 1: 17 - 26

DOI: https://doi.org/10.3973/j.issn.2096-4498.2023.01.002

Construction Timing of Tunnel Secondary Lining in Squeezing Rocks Based on Statistics of Deformation Stabilization Time

LI Lei ,
ZHU Chao ,
LIU Zhichun ,
AN Zhifei ,
LI Ning

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(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)

Online published: 2023-02-16

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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》]t[WT《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》]t[WT《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.

Key words： squeezing rock; railway tunnel; construction timing of secondary lining; deformation classification; deformation stabilization time

Cite this article

LI Lei , ZHU Chao , LIU Zhichun , AN Zhifei , LI Ning .

Construction Timing of Tunnel Secondary Lining in Squeezing Rocks Based on Statistics of Deformation Stabilization Time

[J]. Tunnel Construction, 2023 , 43(1) : 17 -26 . DOI: 10.3973/j.issn.2096-4498.2023.01.002

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