Discrete Element Simulation Of Frozen Sandy Soil Uniaxial Test

Taking frozen sand as the research object,the uniaxial compressive strength test of frozen soil is carried out under different freezing temperature and moisture content conditions,and PFC3 D is used to simulate the test structure,and the uniaxial compression process of frozen soil is explored from the meso angle.The main contents of the paper are as follows:(1)On the basis of experiments,the uniaxial compressive strength of sand under different temperatures and water content was investigated and the test results were analyzed.It is found that the uniaxial compressive strength and related mechanical parameters of the sand have a certain relationship with the temperature and water content.(2)The influence of the mesoscopic parameters on the numerical simulation results is investigated.It is found that when the other parameters are the same,the higher the value of the friction coefficient.The higher the peak value of the curve,and the greater the damage strain.With the increase of the tangential stiffness,the peak strength of the particles is also reduced,while the value of the failure strain decreases.With the increase of the bond strength,the peak strength of the particles is also increasing slowly.With the increase of the tangential bond strength,the peak strength of the particles also increases slowly.(3)By adjusting the normal stiffness,normal bond strength,tangential stiffness,tangential bond strength and friction coefficient,we simulate the uniaxial compression curves of frozen sand under different conditions,and find that the contact adhesive model has better fitting effect.Through the software function,the uniaxial compression process is observed from the meso point angle.(4)The relationship between the mesoscopic parameters and the macro factors is explored.