Study On Road Waterlogging Test And Prevention Technology Of Xinjiang

Highway water damage disasters are highly destructive and serious.With global warming and increased human activities,road water damage has become one of the most important types of road diseases in recent years,it seriously affected traffic safety and interconnection,and hindered regional economy and development.In view of the features that highway water damage of Xinjiang is complex and variable,and it has many influencing factors.Then paper takes the Gaizi River Section of Sino-Pakistan Highway as an case,analyzed the characteristics and damage forms of highway water damage disasters and studied the causes of water disasters,formation mechanisms,prevention techniques by means of field investigation,model test and numerical simulation.The main research results are as follows:First,the following research results were collected through the on-the-spot investigation and the statistical analysis of the water disasters in the Gaizi Section of the Sino-Pakistan Highway,it was concluded that:(1)there were 18 water-destruction points in the Gaizi River Section,and the number of water-destruction points in the canyon section is 6.At the same time,there were 10 water-destroying points in the narrow valley,and 2 water-destroying points in the wide valley.(2)The retaining wall damage in all the water damage disasters of the Gaizi River mainly occured in the canyon section,and the spur damage and dam damage was mainly in the wide valley section.The bridge and the culvert damage and the subgrade water damage occured on the entire line of the Gaizi River.(3)The current problem of water damage in the Gaizi River section was as follows: the depth of the buried structure of the protective structure was insufficient,improper installation of protective structures and inadequate design of protective engineering strength.Second,the Waterlogging phenomenon of the Gaizi River Section in the Sino-Pakistan highway was simulated by the water tank test,The water flow scouring characteristics and the partial flushing depth were studied by the comparison of the fixed bed test,the moving bed test,the single protective structure test and the combined protective structure test.And the results show that:(1)The water flow erosion rule and the scouring phenomenon is consistent with the characteristics of water damage in the field;(2)the length of the sluice recirculation zone is about 70-80 cm,and the spacing between the dams in the dam group should not be greater than the length of the recirculation zone to achieve good protection effect.(3)The scouring position of the dam-type protection structure is mostly located at the base of the dam,and the scouring position of the retaining wall structure is the foundation of the retaining wall in the fast current site;(4)The dimensionless scour formula is obtained by multivariate nonlinear regression fitting,including: the formula for the local scour depth of the spur dike and the formula for the maximum scour depth of the retaining wall,both of the 2 scour formulas can be better applied to the valley area of Xinjiang than the previous formula,and the accuracy of field data is better,and both of two can provide the erosion protection reference for the riverside highway in mountainous area of Xinjiang.Third,the sink test scouring process was simulated by Fluent,the simulation results show that:(1)The flow velocity and dynamic pressure both showed large convex bank and small concave bank;(2)The convex shear stress is initially larger than the concave bank,but under the action of water flow,the shear stress of the convex bank is gradually reduced due to the deposition,and the concave bank continues to scouring under the shear stress;(3)The angle between the spur and the river bank is 60°,90°,135° or when the 135° spur dike group is used,the simulation results are similar;(4)The simulation results are consistent with the sink test scouring rule and the field water destructive feature.Fourth,detailed protection measures are given for the types of highway water damage,and innovative protection structures are proposed in the new road protection technology.Five innovative protective structures are as follows:(1)A roadway shoulder wall flank foundation anti-scour reinforcement structure;(2)a new high embankment low river bed prevention structure;(3)a new type of arc rocky dam structure;(4)a combination of a stone cage wall and a dam group Subgrade anti-shock reinforcement structure;(5)A new type of dam protection structure for peripheral foundation anti-shock reinforcement.The research found that the innovative protection structure has better extreme environmental applicability and engineering economy to a certain extent.The project has strong applicability and can be applied to the subsequent field water damage prevention and control project.