Analysis on Heat Damage Prevention and Control Technology in Sections with High Ground(Water)Temperature of Plateau Tunnel
China's Yunnan,Tibet,Sichuan and other provinces are rich in geothermal resources,and high temperature heat damage problems are often encountered in tunnel and underground engineering construction.In the construction of XB tunnel,water temperature as high as 70.0-96.3℃and rock temperature as high as 50.0-81.5℃were encountered,which brought great risks to the construction and increased difficulties to ensure the structural performance of the engineering.This paper expounds the influence of heat damage on engineering quality and work efficiency.Through engineering practice and application research,the cooling effects of measures such as placing ice,ventilation cooling,local mechanical refrigeration,spray watering,blast hole cooling and reducing heat source are compared and selected.Grouting water plugging materials and mechanical equipment under ultra-high temperature environment are developed,and four conditions for water carrying operation are put forward,aiming at achieving safe and rapid construction and providing reference for similar engineering construction.
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