Study On Waterproof And Drainage Technology And Flood Risk Assessment Of Mountain Highway

Water has an important influence on the stability of pavement and roadbed.Especially in mountainous areas,the hydrology and geology of conditions of highway are complex and changeable,and a large number of water damage phenomena occur every year,resulting in a large number of direct or indirect economic losses.Therefore,we must attach importance to highway waterproof and drainage technology and facilities to enhance the ability of mountain highway to resist flood risk.Based on Pingshan Zanhuang Expressway in Hebei Province,this article introduces the general situation of the project,topographic features and hydrometeorogical conditions.On this basis,the law of rainfall infiltration and the factors affecting infiltration are analyzed,and the influence and damage of surface water and groundwater on roadbed is explained.At the same time,combined with the case,the article analyzed the damage of heavy rainfall on roads,and put forward the corresponding countermeasures.The waterproof and drainage system of mountainous highway mainly designs the surface waterproof and drainage facilities,and studies the relevant hydro-hydraulic calculation methods of the design runoff and drainage capacity of surface drainage facilities.The design and layout of surface drainage facilities are proposed,and the surface waterproof and drainage facilities of Pingzan Expressway are analyzed and introduced.Aiming at the special section of mountain highway,this article studies the drainage of deep excavated side slope and semi-filled and semi-excavated roadbed,with the drainage holes and torrent gutter as the research emphases respectively.The purpose is to analyze and study the causes of subgrade and pavement damage in the special section of mountainous highway,and to put forward the phase.Design methods and optimization measures should be adopted to reduce the occurrence of disasters and ensure smooth roads.In order to make the research of drainage facilities of highway in mountain ares more perfect,this article uses the method of fuzzy comprehensive evaluation,and combines the analytic hierarchy process to determine the weight,and evaluates the rationality of drainage facilities on the surface and underground,which provides a reference method for the rationality evaluation of highway waterproof and drainage system in the future.Finally,the flood risk assessment of highway in mountainous area is studied,and the investigation method,composition of evaluation system,evaluation index and evaluation method of risk assessment are put forward.