IDENTIFICATION OF FROZEN AND THAWING ZONES FOR TUNNEL LEAKAGE TREATMENT IN KUNLUN MOUNTAIN DURING CURTAIN GROUTING

The drilled grout holes are used to test ground water table and ground temperature by chance of curtain grouting at the No.2 valley of Kunlun mountain tunnel.By analyses of ground water table and ground temperature and grouting-amount variation in the drilled grout hole,some ideas on thawing area developed state are identified for treatment of water seepage from the tunnel that:(1) the thawed depth at the No.2 valley is far greater than permafrost table at this area,and ground temperature at slope facing south is greater than that at slope facing north,(2) a thawed area exists 7 m around the center of the tunnel at the No.2 valley,and the thawed depth is below 2 to 5 m under the bottom of the tunnel,(3) the porosity of slope to south is higher than that of slope to north,and there are more than one underground channel between bedrock and the surface at the No.2 valley,the channel under the valley better than of slopes,(4) there are more than one unfrozen channel 17 to 30 m underground along the valley at least.