Study On The Bearing Capacity Of Runway In Permafrost Region Based On Temperature Change

According to the development plan of Chinese airport,China carry out the construction of airport in permafrost region of high altitudes.Although domestic and foreign scholars have studied on the temperature field and bearing capacity of the linear engineering,the research on runway is almost blank in permafrost region.And as global temperatures continue to warm,and the influence of human activity is aggravating,the results lead to the declining of bearing capacity of runway.The evaluation method of runway bearing capacity is established,based on the basic principle of equivalent displacement.Main works are as follows.1.The finite element model of temperature field of runway in permafrost region is given,and effect regularities of annual average temperature,thickness of filling layer and rock block,thickness of EPS insulation board and paving location are further comprehensive studied.2.The finite element model of displacement field of runway in permafrost regions is given.Different displacement fields of the runway are calculated by relevant temperature fields,and many effects on displacement field are discussed.3.According to the elastic layered theory,the finite element model of common soil and permafrost are established,and the equivalent resilience modulus of soil base is calculated in different temperature field.Based on the theory of equivalent displacement,the bearing capacity evaluation method of runway in permafrost region is established.4.According to the different average annual temperature of northeast permafrost region,choosing different replacement depth and protection measures of permafrost,and analyzing a large amount of operating mode,the change on the bearing capacity of runway in different permafrost regions under the trend of global warming is researched in order to provide certain reference value for the runway construction and maintenance of permafrost regions in the northeast.