Study On Uplift Bearing Capacity Of Overhead Transmission Line Foundation In Permafrost Regions

In recent years,with the development of China's permafrost region,the state has increased the construction of transmission lines in permafrost regions.As the permafrost region is more complex geological conditions,permafrost foundation of the various types of frost damage and adverse effects on the construction and safe operation of a serious threat.Frozen areas of the transmission line not only to withstand the upper structure of the base of the load on the load,but also bear the role of freezing force.Therefore,it is necessary to study the uplift bearing capacity of permafrost transmission line foundation.Based on the analysis of the mechanical properties of the permafrost foundation parameters of the permafrost foundation,the FLAC3 D finite difference software is used to simulate the foundation of the permafrost foundation.The stability of the aerial transmission line foundation of the permafrost region is analyzed and studied.The main contents are as follows: point.(1)Study on soil mechanics parameters of permafrost foundation,including unit tangential frost heave force,freezing strength between permafrost and foundation and frozen soil shear strength.The results show that the frost heave force of the frozen soil is the same as that of the frost heave force.The experimental data are obtained by analyzing the tangential frost heave force.The experimental data and the measured data are used to study the freezing strength and permafrost strength of the influencing factors.(2)Using FLAC3 D finite difference software to analyze the column extension foundation of the overhead transmission line in permafrost region,compare the relationship between the melting period and the uplift load and the uplift displacement,and plot the T-S curve to determine the limit load and sliding fracture surface,contrast numerical simulation of the uplift bearing capacity and the specification to calculate the pull bearing capacity.(3)Using FLAC3 D finite difference software to simulate the artificial drilled foundations of the overhead transmission line in permafrost region,the relationship between the uplift and the uplift and the uplift displacement is compared with the melting and freezing period,and the T-S curve is drawn to determine the ultimate load And sliding crack surface.According to the excavation foundation mechanism,the design formula and rationalization suggestion of drawing capacity are put forward for the design and application of excavation foundation under the geological condition with large soil difference.(4)Using FLAC3 D finite difference software to simulate the pile foundation of the overhead transmission line in permafrost region,the relationship between the uplift and the uplift and the uplift was compared with the melting and freezing period,and the T-S curve was drawn to determine the ultimate load.The effect of horizontal load on the displacement is analyzed.Comparing the numerical simulation of the uplift bearing capacity and the specification of the uplift bearing capacity.