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The connecting passage freezing method thaw settlement grouting optimization study in accordance with measured thawing temperature(PDF)

Journal of Nanjing Forestry University(Natural Science Edition)[ISSN:1000-2006/CN:32-1161/S]

Issue:
2017 04
Page:
167-172
Column:
lw
publishdate:
2017-07-31

Article Info:/Info

Title:
The connecting passage freezing method thaw settlement grouting optimization study in accordance with measured thawing temperature
Article ID:
1000-2006(2017)04-0167-06
Author(s):
WU Fan1YANG Ping1*WAN Chaodong2ZHANG Shanggui2HE Wenlong1
1.College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China;
2.China Railway 18th Bureau Group Co.,Ltd.,Tianjin 300222,China
Keywords:
connecting passage freezing method thaw temperature field ground subsidence tracing compensation grouting urban rail transit
Classification number :
U45
DOI:
10.3969/j.issn.1000-2006.201612001
Document Code:
A
Abstract:
【Objective】In the construction of freezing method, grasping the development rule of thawing temperature of the subway interconnecting road is the essential for tracking grouting and controlling the thawing settlement after the construction.【Method】With the background of freezing method project of the soft oil subway interconnecting road, the changing rule of the melting temperature field and deep soil temperature etc. are measured; to control the thawing settlement more efficiently, the opportunity and order of tracking the grouting and the grouting process and materials are optimized.【Result】In the 20-day thawing of the connected aisle, the temperature of some soils began to reach near 0 ℃, and the frozen earth entered the phase transition stage; the deeper the embedded depth, the longer the time of the soil phase change. The soft soil thaw settlement mainly appears two months before thawing and the fully thawing of the side wall and the top takes four months, then, 3—4 months is the least time to track grouting.【Conclusion】During the process of controlling the thaw settlement, the grouting should be carried out in the order of the bottom → the top → the side wall. At the same time, the double control standards should be implemented according to the measured temperature and the land subsidence amount. Reasonable arrangement of construction sequence and grouting parameters, as well as the reinforcement of the monitoring, can further reduce the scope of the soil around the connected aisle affected by the thaw settlement and reduce the impact of the top of the connected aisle by the thaw settlement.

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