The Numerical Simulation On The Dynamical Character Of The Stabilized-Soil

With the development of economy and transportation of our country, the traffic low, vehicle speed and vehicle loading are continually increasing. The influence of traffic load to pavement and road bed dynamation characteristic is greater than before. In the addition, the soft clay is distributed widely in the east coastal area of our country. The problem pf the soft soil roadbed subsidence disease is extremely prominent, such as the crack of highway pavement caused by the roadbed subsidence. So the research to deformation problem of the soft soil roadbed that is under cyclic vehicle load has extremely important meaning.While the inherent nature of the stabilized-soil has changed in some degree, soil density, the airstrikes reduced, increased shear, compression and the decline of permeability, strength and water stable increase. But a lot of test results showed that the deformation of soil still belongs to the deformation basic law.Soil is a kind of complex material that has the mechanics characteristic of non-linearity, elastic-plastic nature, non-homogeneity, anisotropism and rheology. At the same time stress level, stress path, stress history as well as soil condition, composition, structure and temperature have the remarkable influence to its nature. The elastic-plastic deformation nature is one of the earth important natures. The elastic-plastic theory of soil mainly includes loading and unloading criterion, flowing principle and induration rule three aspects contents. As for the soil material, Mohr-Coulomb yield criterion and Drucker-Prager yield criterion are the yield condition or the destruction condition applied most. The constitutive relationship is the mathematical expression that reflects mechanics performance of material. The constitutive relationship model of soil mainly includes the elastic model, the elastic-plastic model, the bounding surface model, viscoelastic and plastic model, inner time model, the damage model, the microstructure model and so on.The dynamic strength and deformation problem is one of the research content of soil dynamics. The soil dynamics performance research needs in close integration with the theoretical analysis, the room experiment, the field test, the prototype observation and model experiment. It need a series of disciplines knowledge and the achievement such as soil mechanics, the earthquake engineering, structure dynamics, the soil earthquake resistance and so on to make the multi- ways long time system exploration. This article uses the sine wave load to simulate the traffic circulation load.For the dynamical characteristic of the stabilized-soil, this article uses finite element ABAQUS to ser up the 3-dimensional finite element model of the dynamic tri-axial specimen, simulate the dynamical deformation behavior of the stabilized-soil under cyclic load. Finite element method as a most powerful tool of the numerical analysis, in the geotechnical engineering analysis, it has been widely applied. With the rapid development of the computer technology, in the field of geotechnical engineering applications made great progress. therefore, the finite element method has become geotechnical engineering analysis of the flexible, practical and effective means.This paper focuses on the freezing temperature of the strengthen soil of the plastic deformation. Meanwhile, the influence to the strengthen soil dynamical characteristic such as cyclic load's magnitude, the number of cyclic load. Frequency, confining pressure and damping factor was researched by the method of numerical simulation.1. Maintaining cyclic load's amplitude, confining pressure, Frequency and other factors unchanged, with the freezing temperature increased and the soil deformation decreased.2. Along with the increase of the cyclic load magnitude, the accumulated plastic deformation increased. confining pressure fixed, the greater the dynamic shear stress, the greater the plastic deformation.3. Cyclical load in the role, after each round and returning to the initial positions, the soil have certain plastic deformation, Plastic deformation of soil to accumulate, the discovery of the performance cycle activity. At the initial ,deformation of the soil samples faster development, but when the number of the load to a certain number, the deformation of soil samples gradually slow. Soil achieve a steady state of vibration.4. Plastic deformation is gradually increading, with the increase in the number of cycle. cyclic stress amplitude fixed, the greater the confining pressure, the slower deformation of soil slower growth.5. To impose the same confining pressure and the size of the same cycle of stress for the sample, the lower the frequency, the greater the amplitude of plastic deformation; the higher the frequency, the plastic deformation of the smaller amplitude.6.In the lower frequencies, only less cycle on the destruction of a few samples, with the frequency increasing. Specimen achieve their destructive cycle of several increases.7. With the increase in damping, plastic deformation gradually decreased and the decreased rate is relatively large.