考虑细观颗粒破损的粒状材料弹塑性本构模型研究 English Version
Study on elastoplastic constitutive model of granular materials considering meso-particle damage
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摘要: 建立考虑颗粒形状与破碎物理机制的粒状材料本构模型，是土石坝工程力学稳定性计算的重要理论基础。本研究讨论了不同形状的粒状材料内部颗粒破碎、转动和滑移等对变形的影响规律，基于岩土损伤力学及热力学定义，构建了考虑颗粒形状的颗粒破碎功及剪胀能数学表达式；并结合颗粒破损率方程，阐释了压缩过程颗粒破碎功、剪胀能和破损程度的演化规律，定量揭示了粒状材料的细观破碎变形机制。最后，将颗粒破碎功、剪胀能的定量计算方程引入D-C模型，建立了一个考虑颗粒形状与细观破碎机制的粒状材料弹塑性本构模型，并通过试验曲线与理论曲线的对比，验证了该模型的合理性和可靠性。Abstract: Establishing a constitutive model for granular materials that accounts for particle shape and breakage mechanisms has been crucial for calculating the mechanical stability of earth-rock dam projects. Initially, the impact of particle breakage, rotation, and sliding on the deformation of granular materials with varying shapes had been examined. Subsequently, based on geotechnical damage mechanics and thermodynamics, mathematical expressions for particle crushing energy and dilatancy energy that consider particle shape were developed. By incorporating the particle breakage rate equation, the evolution of particle crushing energy, dilatancy energy, and breakage degree during compression was elucidated, quantitatively revealing the meso-particle breakage deformation mechanism. These mathematical relationships of meso-deformation mechanisms were then integrated into the existing D-C model, resulting in an elastoplastic constitutive model that considers both particle shape and meso-particle breakage mechanisms. The model's validity and reliability were confirmed by comparing experimental curves with theoretical predictions.
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期刊类型引用(1)
1. 李建彪，邬叶飞，马思伟，孙昌利，邵康. 土体侧移作用下螺旋钢桩被动承载机理分析. 路基工程. 2024(05): 32-38 . 
百度学术
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