Experimental Study On Damage Of Mechanical PR Operties Of Artificially Prepared Ruins By Freeze-tha W Cycles

The western part of China is in a seasonal area,and its mechanical properties are attenuated by freezing and melting.The deformation and destruction process of permafrost area is essentially a process of continuous accumulation of damage.lt is of great significance to study and protect the soil of the site by understanding and mastering the damage caused by artificial preparation of soil mechanics under permafrost and melting cycle.On the basis of indoor tests,a statistical damage model is established based on damage theory and strain equivalence principle.The damage of artificial soil in permafrost and melting cycle was studie:d systematically.First of all,the samples were tested without lateral limit compressive strength,taking into account the effect of drying density,freezing and melting cycle times and the quality ratio of soil and glutinous rice paste on the unlateral limit compressive strength of the artificial soil.The paper also analyzes the attenuation law of the unlateral limit compressive strength of the soil of the site,based on the theory of damage and the principle of strain equivalence.A statistical damage model of the soil at the site was prepared artificially under the effect of freezing and melting cycle by using the distribution function of zibium,and the rationality of the model was verified.Secondly,based on the shear test,the effect of the ratio of the quality of the soil and glutinous rice paste and the frequency of the freezing and melting cycle on the shear strength and displacement curve of the soil at the site was considered.The damage coefficient of soil adhesion and internal friction angle was established for the artificial preparation of different quality ratio of soil and glutinous rice paste under freezing and melting cycle.At the end of the test,the samples were tested on three axes of water drainage,taking into account the stress of artificial soil preparation under the ratio of quality to glutinous rice pulp,density of glutinous rice paste,compaction and permafrost.Influence of strain relationship,shear strength parameters and damage intensity,The paper also analyzes the attenuation rule ofshear strength parameters of soil at the site under the effect of freezing and melting cycle,and the effect of freezing and melting on e--Influence of parameters of south water model,On the basis of damage theory and strain equivalence principle,the permafrost-melting is considered by using the distribution function of ibib and the criterion of IRR-Coulomb.A statistical damage model was prep ared by artificial soil under load coupling,and the parameters of the model were determined according to the characteristics of the soil stress-strain curve of the site.To verify the rationality of the statistical damage model by using the mechanical properties parameters of the soil of the site by artificial preparation,The change law of total damage variables with frozen melting cycle is also discussed.