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Study on the Ambient Temperature Control Technology for Construction of
a Tunnel Near Heat-conducting Fault and with High Rock Temperature
(1. School of Civil Engineering, North China University of Technology, Beijing 100144; 2. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044; 3. Road and Bridge Engineering Department of Hebei Jiaotong Vocational & Technical College,Shijiazhuang 050035; 4. China Railway 16th Bureau Group 4th Engineering Co., Ltd., Beijing 101400)
Abstract In order to investigate the ambient temperature control technology for construction of a tunnel near heatconducting fault and with high rock temperature, the cooling effectiveness of the solutions including mechanical ventilation + ice, mechanical ventilation + mist spray and mechanical ventilation + ice + mist spray has been studied under different mechanical ventilation rates by using a tunnel project with high rock temperature as the study case.The results indicate: greater mechanical ventilation rate enables faster cooling rate and greater temperature drop;when mechanical ventilation rate is increased to a certain level, the tunnel cooling effectiveness is no longer improved notably, and other auxiliary measures are needed to further reduce temperature; in cooling by ice, consumption of more ice will bring faster cooling rate and better cooling effectiveness; in the mechanical ventilation + ice +mist spray solution, the average cooling rate is 5.37 °C/min, temperature drop is 53.74 °C and the stable ambient temperature is 26.26 °C, so this solution is the most effective solution for ambient temperature control in tunnel construction; when this temperature control solution is applied on site, the rock temperature at tunnel face is reduced to
46.1°C and the ambient temperature in tunnel is 25~27 °C, which meets the applicable standard.
Abstract：
In order to investigate the ambient temperature control technology for construction of a tunnel near heatconducting fault and with high rock temperature, the cooling effectiveness of the solutions including mechanical ventilation + ice, mechanical ventilation + mist spray and mechanical ventilation + ice + mist spray has been studied under different mechanical ventilation rates by using a tunnel project with high rock temperature as the study case.The results indicate: greater mechanical ventilation rate enables faster cooling rate and greater temperature drop;when mechanical ventilation rate is increased to a certain level, the tunnel cooling effectiveness is no longer improved notably, and other auxiliary measures are needed to further reduce temperature; in cooling by ice, consumption of more ice will bring faster cooling rate and better cooling effectiveness; in the mechanical ventilation + ice +mist spray solution, the average cooling rate is 5.37 °C/min, temperature drop is 53.74 °C and the stable ambient temperature is 26.26 °C, so this solution is the most effective solution for ambient temperature control in tunnel construction; when this temperature control solution is applied on site, the rock temperature at tunnel face is reduced to
46.1°C and the ambient temperature in tunnel is 25~27 °C, which meets the applicable standard.
CUI Guangyao1 WEI Yifei1 XIONG Yong1 WANG Daoyuan2,
3 TIAN Xiaolu4
.Study on the Ambient Temperature Control Technology for Construction of
a Tunnel Near Heat-conducting Fault and with High Rock Temperature[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(6): 246-254
2023, Vol. 60 