TYPES OF WATER DAMAGE AND OPTIMAL DESIGN OF PREVENTION MEASURES ALONG GAIZI SECTION OF SINO-PAKISTAN HIGHWAY

As for the fact that the frequent and serious water damage disasters in the Gaizi River section of Sino-Pakistan Highway, we performed analysis and optimization design research for the actual road waterlogging disasters. In investigation, we found there was a total number of 18 water damaged work sites in the Gaizi river section. The work sites had various types and they were segmental distributed. The result shows that the hydrology and topographic conditions of the Gaizi River control the occurrence and development of water damage at the worksite. The hydrodynamic conditions are the most important control elements of water damage on roads. The valley terrain controls the distribution characteristics and the destructive form of water damage. The combined effect of hydrology and topographic conditions contributed to the current distribution of water destroyed worksites in the Gaizi river section. After verifying the current water damage characteristics and the water damage problems by hydraulic model test, we analysed the characteristics in real water damage disasters and the problems existing in the prevention and control project in paper. We proposed the optimal design scheme of typical water damage prevention and control project from the perspective of technical scheme adjustment and economic rationality. Finally, it was found that the protection effect was better in the later operation.