Development characteristics of freezing temperature field of coastal soft soil strata

CHEN Junhao; ZHUANG Yan; CHEN Bijian; ZHAO Zhenwei; WANG Qiyun

doi:10.3969/j.issn.1001-1986.2020.04.024

Volume 48 Issue 4

Aug. 2020

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COAL GEOLOGY & EXPLORATION > 2020 > 48(4): 174-182. > DOI: 10.3969/j.issn.1001-1986.2020.04.024

CHEN Junhao, ZHUANG Yan, CHEN Bijian, ZHAO Zhenwei, WANG Qiyun. Development characteristics of freezing temperature field of coastal soft soil strata[J]. COAL GEOLOGY & EXPLORATION, 2020, 48(4): 174-182. DOI: 10.3969/j.issn.1001-1986.2020.04.024

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Development characteristics of freezing temperature field of coastal soft soil strata

1. School of Civil Engineering, Fujian University of Technology, Fuzhou 350118, China;
2. Key Laboratory of Underground Engineering, Fujian Province University, Fuzhou 350118, China

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Fujian Provincial Natural Science Foundation Projects(2017Y4001)

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Received Date: February 06, 2019
Revised Date: May 27, 2020
Published Date: August 24, 2020

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Abstract

In order to research the temperature fields and development law of freezing in the construction of connected aisle in coastal soft soil stratum, based on connected aisle between Luoxiu road station and Baise road station of Shanghai subway Line 15, the thickness and average temperature of frozen curtain, and the freezing process were analyzed. The temperature fields and development law of freezing were predicted by the three-dimensional numerical model of the connected aisle and the temperature data which were analyzed. The results show that the inherent pressure in soft soil causes initial pressure in the pressure relief hole. A lot of cement paste was injected during the burial of the freezing tubes, which will inhibit water migration and reduce the effect of frost heaving during the freezing process. The process of freezing can be divided into four stages by temperature:rapid drop of temperature, drop of temperature decreases first and then increases, slow drop of temperature, temperature stability. The rate of development speed of frozen inside and outside curtain is 1.42︰1. The grey silt freezes faster than silty clay with silt. The development freezing speed of silty clay with silt and grey silt are 20.02 mm/d and 29.75 mm/d.
- freezing method,
- soft soil,
- connected aisle,
- frozen curtain,
- temperature field,
- numerical simulation

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