| Saliva ice is a unique cold phenomenon in cold regions,which brings great threat to road,slope protection structures of stability and traffic safety.Currently domestic and international relevant saliva ice disease research mainly concentrated in the permafrost regions of low grade highway. The research for saliva ice formation mechanism is mainly general rules without a thorough internal formation mechanism study and comprehensive research of prevention measures. Therefore,this paper carry out research about saliva ice disease on the basis of Tongchuan to Huangling highway.The internal forming mechanism and development of law to the highway saliva ice disease are studied through the domestic and foreign research, onsite test, finite element simulation and saliva ice into theoretical analysis model of ice. Three new combined control measures are proposed, and the using effect of the two methods are verified by the theory and the field observation. The main research contents are as follows:1. Main features and influencing factors of highway saliva ice is proposed in basis of investigation and research for cold temperate zone,climatic zone,Middle temperate zone,field observation and fieldwork relying on the highway.2. Finite element simulation software is used to analyse the influence of groundwater,Rock material parameters,temperature below 0℃. At the same time, nine iceberg disease on the project is analysed.Then we analyse the mechanism of ice formation.Also we know the freezing and pressure effects of closed three layers and internal development mechanism.3. According to the disease situation along the project, six traditional measures and three new combination control measures are put forward based on the above information investigation,simulation and analysis of the formation mechanism.4. By using analytic hierarchy process method and numerical simulation the effectiveness of two new combined control measures adopted in the project is evaluated,then verified by the field. |
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