|Table of Contents|

Construction and measurement analysis of freezing method for 60 m level super long connecting passage(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年06期
Page:
148-156
Research Field:
桥梁工程
Publishing date:

Info

Title:
Construction and measurement analysis of freezing method for 60 m level super long connecting passage
Author(s):
WU Yongzhe1;  ZHU Zexuan2;  YANG Ping2;  LIU Hongwei1;  WU Wenliang1
(1. CCCC Tunnel Engineering Company Limited, Nanjing 210007, Jiangsu, China; 2. College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, China)
Keywords:
super long connecting passage;  freezing method;  temperature field;  frost heave;  thaw settlement;  measurement analysis
PACS:
TU445
DOI:
10.19815/j.jace.2021.11039
Abstract:
In order to comprehensively grasp the freezing temperature field, frost heave and thaw settlement deformation laws of the 60 m level super long connecting passage, and accumulate experience for similar projects in the future, the temperature and deformation measurement research was conducted on the freezing method construction process of the 66 m super long connecting passage between Ziyang station and Wuliting station on Fuzhou metro line 2. The construction process, freezing temperature, and formation deformation law of the super long connecting passage were analyzed through actual measurement, and the characteristics that were different from conventional connecting passages were summarized. The results show that compared with conventional connecting passages, super long connecting passages require a series of optimizations and improvements in terms of structural design, freezing scheme, construction technology, and other aspects to ensure the smooth completion of freezing construction while also considering economic efficiency. During the freezing and cooling process, the development rate of freezing inward is 1.75 times that of outward development. There is a difference in the law between the measurement points at the oblique freezing pipe and the conventional connecting passage in the silt and sand layer. The temperature of the measuring point in the overlapping area of the frozen tube is lower than that in the non overlapping area. Due to the larger volume of frozen soil, the surface uplift and settlement are larger compared to conventional connecting passage, and the impact range is wider. The smaller the distance between the measuring points on the same section and the centerline of the tunnel, the greater the displacement. When the measuring point exceeds the centerline of the tunnel by 20 m, the amount of frost heave and thaw settlement is relatively small. The frost heave and thawing settlement of point D5-4 at the centerline are 2.8 times and 2.3 times that of point D5-1 at a distance of 20 m from the centerline. The maximum frost heave and thaw settlement of each section occurs at the centerline of the tunnel and is distributed along the centerline of the connecting passage. Due to the large volume of frozen soil at the end section of the connecting channel, its frost heave and thawing settlement are 1.6 times and 1.7 times that of the centerline, which is different with conventional connecting passage.

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Last Update: 2023-12-01