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本文基于颗粒流理论,引入不同的颗粒接触连接本构模型,分别建立了砂土和粘性土的颗粒流模型。通过颗粒流数值模型试验,从细观力学角度对土的工程力学特性作了初步的研究。对砂土和粘性土的室内平面应变试验及其剪切带形成和发展进行了数值模拟,分别对比了不同围压下颗粒流试样与室内试验的应力应变关系曲线,基本再现了砂土和粘性土试样应力-应变关系。通过分析围压-时步曲线、体变曲线和不同阶段的颗粒位移场的变化规律,研究了剪切带的形成与发展规律。
Based on the theory of particle flow, different particle contact connection constitutive models are introduced in this paper, and the particle flow model of sand and clay is established. Based on the numerical simulation of particle flow, the engineering mechanical properties of soil are studied from the perspective of mesomechanics. The indoor plane strain test and the formation and development of shear zone of sand and clay are numerically simulated. The stress-strain curves of particle flow test and laboratory test under different confining pressures are compared respectively. Stress - Strain Relationship of Cohesive Soil Samples. By analyzing the confining pressure - time step curve, body deformation curve and the variation law of particle displacement field in different stages, the formation and development of shear band are studied.