Field Measurement Study on Temperature Field of Mass Concrete Shaft Lining by Freezing Sinking Method
GUO Yu-chao
JI Hong-guang
LI Cheng-jiang
CHEN Zhi-jie
CHEN Bo
Abstract：Auxiliary shaft of Yingpanhao Coal Mine was built by full depth freezing method. The tem-perature field variation law of shaft lining was analyzed by three levels temperature field measurement in the process of pouring concrete to inner shaft lining. The results show that after the mass concrete being poured ,a large amount of hydration heat is produced ,the temperature of inner shaft lining goes up ,peak temperature will appear in 1.25~1.5 days ,it can reach 86 ℃. Hydration heat will transfer to the freezing wall ,lead to the temperature of freezing wall go up ,peak temperature can reach 21.9 ℃ , the temperature rising extent is 23.4 ℃. At the same time ,the partial freezing soil behind shaft lining begin to thaw ,the maximum thawing range can reach 1 920 mm ,it causes adverse effects to the stabili-ty of shaft lining. Subsequently ,under the common function of cooling capacity from brine circulation in freezing tubes and hydration heat ,the temperatures of inner shaft lining and freezing wall begin to fall. To about 35 days after pouring concrete ,inner shaft lining temperature is stable in positive tem-perature ,which is good for early strength development of the inner shaft lining concrete.
Keywords：freezing shaftmass concreteheat of hydrationtemperature fieldfield measurement
Publication Date：2015-08-17
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 36-40 )