In-situ Monitoring And Analysis Of Typical Frozen Soil Development In Harbin

In recent years,issues related to frozen soil have been paid more and more attention.Among the total land in our country,a large part of the area has been affected by frost heave.According to statistics,61.4% of the land in China has been subject to ice and snow.The influence of soil,among which the obvious hydrological effect of frozen soil mainly includes northeast,northwest and Qinghai-Tibet Plateau,accounts for about half of the country's land area.Due to the complexity and technical limitations of frozen soil hydrology research,this science is still in a relatively weak state in the theoretical and methodological research at this stage.Therefore,real-time monitoring and analysis of the development process of frozen soil in typical cold regions is of great significance to the development and promotion of frozen soil hydrology in cold regions.The development process of frozen soil is an important parameter to measure the climatic conditions in the area.Based on the design of the plan and the design,installation and commissioning of the monitoring device,the development process curve of the frozen soil is drawn.Through the characteristic parameters of the development of frozen soil,the frozen area in the study area is analyzed and quantified.In the process of soil development,explore the development law of frozen soil in typical cold regions,and then explore the effect of temperature changes on ground temperature in the study area.It is pointed out by test analysis that:1.Provide a viable,stable,time-saving and labor-saving method for monitoring frozen soil through this test,and it can be extended to other locations with similar geological conditions.2.Propose a method for drawing and analyzing the development process of frozen soil.3.The typical frozen soil research area-Harbin Heilongjiang University Frozen Soil Monitoring Test Field during January 1,2019 to January 1,2020,the limit freezing depth is 116.78 cm,the average freezing rate is 1.33cm/d,two The indicators are less than the limit freezing depth and the average freezing rate of the same period from 2006 to 2007.It may be because the monitoring device is buried in the dense urban area,so it indicates that the monitoring results are in a reasonable range.4.According to the coupling of frozen soil development process line and airtemperature and ground temperature,explore the relationship between air temperature and freezing depth and ground temperature.5.The hysteresis of the downward transmission of temperature,that is,the peak temperatures of the ground surface and the soil depths of 20 cm,50cm,and 100 cm after the temperature peaks are 1.1d,2.0d,3.3d,and 5.2d.