FORMATION AND CONTROL OF DEBRIS FLOW DISASTER AT NORTH AREA OF THE TIANSHAN HIGHWAY IN THE XINJIANG UYGUR AUTONOMOUS REGION

Debris flow is a main disaster type in north Tianshan highway in the Xinjiang Uygur Autonomous Region. The formation environment of debris flow disaster in north Tianshan highway in Xinjiang was analyzed in system from abundant debris flow materials, peculiar geomorphological character and the climate condition of foehn effect. The debris flow in the area was classified into slope debris flow and ditch debris flow, and the debris flow distributed centralized in the Lapat watershed area, the velocities calculation formula of each debris flow type was established. Two new techniques of shed drainage-diversion structure and debris flow tunnel which can be used to control the debris flow disaster in north Tianshan highway well were developed. The former technique was used to control the slope debris flow and the later was used to control the ditch debris flow, and each technique was applied to control the debris flow disaster in correspondence with K616 and K631 along Tianshan highway. The control effect of each technique was proved by physical model experiment in the room. The experiment result indicated that the proposed control technique was well practicable, the highway traffic can be unhindered during the debris flow breaking out.