In-situ Measurement and Analysis of Freezing Temperature Field of Shaft in Western Jurassic Stratum Deep Bedrock
LIU Jun-quan
HAO Jian-zhong
WANG Hong-song
HAN Bo
WU Ya-feng
Abstract：To master the development law of freezing temperature field of shaft in western Jurassic stra ‐tum deep bedrock , according to the thickness of shaft liners and the different grade of concrete strength of Hongqinghe Coal Mine No.2 air shaft in Xinjie Mining Area ,monitoring and measuring levels were set and a site measurement study was conducted on the temperature of the shaft liner and the freezing wall during freeze sinking ,temperature field variation law of the region in certain freezing conditions was obtained. The results indicate that the heat of hydration of the C 70 mass concrete in shaft crib points reaching the maximum of 71.32 ℃ within 30 ~ 36 h ,the heating rate is about 40 ℃ /h and the cooling rate is around 4 ℃ /d. The temperature variation of the external shaft liner would have three stages and they were a linear rapid increasing stage ,nonlinear rapid decreasing stage and stable stage. The concrete mix determines the heating degree of hydration heat and the thickness of shaft lin‐er determines the time span of hydration heat.
Keywords：jurassic stratumdeep bedrockfreeze sinking methodfreezing temperature fieldmass con-crete
Publication Date：2015-02-15
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 32-35 )