Abstract:

The highest temperature measured at the working face of Qireha tal hydropower tunnel reaches 110 ℃, which has serious influence on the tunnel construction. In the paper, the causes for the high ground temperature are analyzed, the influences of the high ground temperature on the tunnel construction are studied, and cooling measures are proposed, so as to guarantee the successful construction of the tunnel. The study result shows that: 1) The region possesses very high heat flow value, and the heat flux transfers to the ground surface along the faults, thus forming the high ground temperature section; 2) Technologies used, such as tunnel ventilation combined with local ventilation and cold water and artificial ice, can solve the high ground temperature problem.

Key words: high ground temperature, hydropower tunnel, ventilation, cooling measure, Qireha tal hydropower station