Abstract:

The Langkazhi-Road is the west part of the ring road of Shannan district in Tibet, which is 120 km long. The road's functions are transportation, diplomacy and military affairs.The road is located in the tableland, chilliness and intense neotectonic movement area. The geologic background, special climate and geography environment provide the conditions for geologic hazards occurring. Drift ice is accumulative ice that water become when it is flowing due to continuous minus temperature. Water and minus temperature are essential conditions for drift ice occurring. There are 10 drift ices along the Langkazhi-Luoza Road in Tibet, which threaten the road length 457 m seriously. According to the characters of the drift ice, the local environment and the road grade, the culvert or drain is the feasible effectual method to deal with it, but we must prevent the culvert or drain be freeze.

Key words: drift ice, character, Tibet