珊瑚砂颗粒破碎本构模型构建研究  

A constitutive model of coral sand considering particle fragmentation based on uniform hardening parameters

作　　者：杨震霆 蒋敏敏[1] 李宇 白方威 YANG Zhen-ting;JIANG Min-min;LI Yu;BAI Fang-wei(Henan University of Technology,Zhengzhou 450001,China)

机构地区：[1]河南工业大学,郑州450001

出　　处：《水道港口》2023年第1期103-111,共9页Journal of Waterway and Harbor

基　　金：国家自然科学基金项目(51408197)。

摘　　要：颗粒破碎是珊瑚砂区别与其他土体的显著特征,文章从珊瑚砂等向压缩试验出发,引入统一硬化参数和考虑颗粒破碎的状态参量,分析珊瑚砂硬化规律;在修正剑桥模型框架下,构建形状参数以反映颗粒破碎和密实度对珊瑚砂屈服面的影响,继而建立了一个能够考虑颗粒破碎和初始孔隙比的珊瑚砂弹塑性本构模型,并通过与试验数据进行对比,验证了此本构模型的合理性;采用半隐式应力积分算法将所建立的模型进行了UMAT子程序开发,通过与模型计算结果对比后数据吻合良好,验证了此子程序的准确性。Distinctive to coral sand,particle fragmentation sets it apart from other soils.To analyze the hardening law of coral sand,a past isotropic compression test informed this study′s introduction of a unified hardening parameter and a state parameter that considers particle fragmentation.Within the modified Cambridge model framework,shape parameters were developed to reflect the effects of particle fragmentation and compactness on the yield surface of coral sand.This led to the establishment of an elastic-plastic intrinsic model of coral sand that can factor in particle fragmentation to the initial porosity ratio.Experimental data were used to verify the model′s validity.Finally,to develop a UMAT subroutine for the model,a semi-implicit stress integration algorithm was employed.Comparison of the subroutine′s data with the model′s calculation results has confirmed its accuracy.

关 键 词：珊瑚砂 等向压缩试验 临界状态 统一硬化参数 UMAT子程序 

分 类 号：U656[交通运输工程—港口、海岸及近海工程] TU43[交通运输工程—船舶与海洋工程]