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考虑颗粒破碎影响的粗粒土本构模型

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Indexed by:期刊论文

Date of Publication:2009-11-10

Journal:岩土力学

Included Journals:EI、PKU、ISTIC、CSCD、Scopus

Volume:30

Issue:11

Page Number:3261-3266,3272

ISSN No.:1000-7598

Key Words:颗粒破碎 破碎耗能 应力软化 变异粒子群优化算法 摩擦系数 临界状态线 剪胀 particle breakage breakage energy stress-softening mutation particle swarm optimization algorithm friction coefficient critical state line dilatancy

Abstract:颗粒破碎直接改变了粗粒土本身结构,对粗粒土的剪胀、内摩擦角、峰值强度、渗透系数都会产生影响.为了能够准确地描述粗粒土的应力-应变关系,特别是高应力条件下出现显著颗粒破碎时的应力-应变关系,亟待建立考虑颗粒破碎的粗粒土本构模型.根据三轴试验数据,建立考虑颗粒破碎耗能的应力-应变关系,采用相关联流动法则导出考虑颗粒破碎的粗粒土本构模型.所建立的本构模型考虑了颗粒破碎对粗粒土剪胀、内摩擦角的影响.通过变异粒子群优化算法确定模型参数,拟合试验曲线.模型计算结果与试验曲线拟合较好,能够很好地描述粗粒土在不同围压下的体积剪胀、剪缩和应力硬化、软化现象.

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