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Monitoring and studying the freezing temperature field in deep fractured rock mass with high confined water

LI Dongwei;ZHOU Yan;JIN Pengwei;LI Yang;ZHANG Han;State Key Laboratory of Frozen Soil Engineering,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences;College of Civil Engineering,Fujian University of Technology;College of Civil Engineering and Architecture ; Anhui University of Science and Technology;College of Civil and Environmental Engineering,Hunan University of Science and Engineering;  
Through the in-situ measurement of the mine sunken by freeze sinking in deep high-pressure water stratum,the temperatures of fractured rock mass monitored by thermometers allocated in various horizons and the variation of looping brine temperature were obtained.In the initial,temperatures in the monitoring holes dropped almost linearly.When temperature continuously decreased to the freezing temperature of the rock,the cooling rate gradually increased.When the frozen wall reached the design temperature,the monitored temperature changed gently.Cooling rate of the outside of the outer ring changed most slowly,and that between the two rings changed most fast.Cooling rate at different horizons and in different locations were inconformity,for example,cooling rate was 0.9 ℃ · d~(-1) at the temperature monitoring hole C3~# of sandy mudstone at 209 m deep and cooling rate was 0.54 ℃ · d~(-1) at the temperature monitoring hole C1~# of pebble bed at 92 m deep.Therefore,the design parameters such as the circle shift time,thickness and average temperature when frozen wall composed can be inferred from the monitored temperature.The monitored data have significant practical significance for guiding the design and construction of freeze sinking in deep fractured rock mass.
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