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Constitutive Model for Coarse Granular Soil Incorporating Particle Breakage

Author: LiZhaoMing
Tutor: ChiShiChun
School: Dalian University of Technology
Course: Disaster Prevention and Reduction Engineering and Protective Engineering
Keywords: coarse granular soil particle breakage constitutive model particle swarm optimization method
CLC: TU43
Type: Master's thesis
Year: 2007
Downloads: 402
Quote: 3
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Abstract


In recent years, with the development and application of large machinery rolling rocktechnology, large size coarse granular soil can be rolled into a relative close state. Rolledcoarse granular soil has the characteristics of small compressibility, high strength, goodeconomic construction and construction fast. So it is widely used in water conservancy andtraffic earth engineering constructions especially in high embankment dam construction.Coarse granular soil is made of soil granules of different size which fill each other. Testshows that the coarse granular soil is easy to break even though beared not extremely greatenergy and compression force. Particle breakage changed the particle size, size distributioncurve and dense of coarse granular soil, affect its subsequent stress-strain behavior, especiallyhas a strong role of weakening dilatancy. So developing elastoplastic constitutive modelincorporating particle breakage has practical significance of grasping the engineeringproperties of coarse granular soil and improving the analysis precision of stress-deformationfor embankment damThis article first comprehensively analyzes parameters which are used to measureparticle breakage. This article also analyzes advantages, disadvantages and the scope ofapplication of each parameter. Research found that there is some relation between coarsegranular soil breakage caused by stress and deformation and particle breakage caused bynatural weathering, common ratio of natural weathering model can be used to describe brokenindex caused by stress and deformation of coarse granular soil. Through analyzing the testdata of particle breakage of triaxial test, the formula to calculate particle breakage parameteris developed. Then, through analysis of the force of soil particles under triaxial stress, a yieldsurface equation is derived which incorporates particle breakage according to Rowe’sminimum energy ratio principle. After studying plastic flow rule, harden law and elastic lawan elastoplastic constitutive model for coarse granular soil incorporating particle breakage isproposed. Finally the model parameters are determined by using the modified swarmoptimization fitting triaxial test curve. Using these parameters triaxial test stress-strain curveof other confming pressure is calculated. Comparing the results calculated by this model withtest data the valid of this model is verified.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Soil Mechanics
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