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

WU Fan,YANG Ping,WAN Chaodong,ZHANG Shanggui,HE Wenlong

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (04) : 167-172.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (04) : 167-172. DOI: 10.3969/j.issn.1000-2006.201612001

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

  • WU Fan1,YANG Ping1*,WAN Chaodong2,ZHANG Shanggui2,HE Wenlong1
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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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WU Fan,YANG Ping,WAN Chaodong,ZHANG Shanggui,HE Wenlong. The connecting passage freezing method thaw settlement grouting optimization study in accordance with measured thawing temperature[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2017, 41(04): 167-172 https://doi.org/10.3969/j.issn.1000-2006.201612001

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