Study On Mechanical Properties Of Accumulation Body And Its Influence On Slope Stability

Accumulation body is a kind of geological material different from soil and stone.Complex material composition and variable particle size means that the physical and mechanical properties of soil and stone can not be simply combined.Its speciality is mainly because it is composed of soil particles,stones and pores,and the mechanical properties are mainly determined by the proportion of soil particles and stones,the random distribution of rocks and the degree of particle cementation,and these factors also change with the load.Generally speaking,the main contents of this thesis are as follows:(1)By using the particle flow method in the two-dimensional particle discrete element method and the results of the previous laboratory experiments,a two-dimensional direct shear test model of accumulation body is established.The influence laws of different rock content,rock mass distribution and the degree of particle bonding on the shear strength of accumulation body are analyzed,and the influence rules are explained.Production mechanism.The influence of rock aggregate and rock distribution on the comprehensive shear strength and the formula of shear strength of composite medium are verified.(2)The AUTOCAD grid model of pile side slope is established.Based on the AUTOCAD mesh model and the PFC2 D particle flow model program,according to the influence of the rock content against the shear strength parameters and the relation between the meso parameters and the shear strength parameters,the meso parameter calibration method of different rock mass accumulation bodies and the pile side under different rock content are established.Slope PFC2 D particle flow model.(3)Based on the PFC2 D particle flow model of the pile slope,the variation of displacement deformation and point coordinate at any time in the dynamic evolution process of the slope of the pile slope under different rock content is analyzed.The mechanism of the displacement changes of the pile slope with different rock content is explained,and the strength fracture of the particle flow method and the finite element is compared.The difference between the results of the subtraction and the other calculation methods of the finite difference strength reduction method proves the applicability and superiority of the particle flow method in the slope stability analysis.