工程科学与技术2024，Vol.56Issue(3)：90-98,9.DOI:10.12454/j.jsuese.202300388
基于三剪统一强度理论的多晶冰软化本构模型研究及应用
Research and Application of a Polycrystalline Ice Softening Constitutive Model Based on Triple-shear Unified Strength Theory
摘要
Abstract
As global warming intensifies,mountain and polar glaciers are retreating at an accelerated pace.The frequency of large-scale glacier collapse and sliding is gradually increasing.Polycrystalline ice constitutes the primary form of glacial ice.The constitutive model of polycrystal-line ice holds significant importance for glacier stability analysis,mass balance,and multi-field coupling simulation.Drawing from the Triple-shear unified strength theory,we propose yield and plastic potential functions that can effectively account for the influence of principal stress.Considering the variation of cohesion throughout the loading process,we construct a hardening function based on equivalent plastic strain.An elastoplastic constitutive model with non-associated flow is established to capture the softening characteristics of polycrystalline ice.The validity of this model is confirmed through conventional triaxial compression tests of polycrystalline ice,demonstrating its ability to accurately describe axial strain-deviator stress and axial strain-volumetric strain behaviors.Subsequently,we predict the true triaxial axial strain-deviator stress and axial strain-volumetric strain behaviors of polycrystalline ice under different medium principal stress coefficients.Our predictions reveal signific-ant softening in the deviator stress-axial strain curves of polycrystalline ice,with both residual strength and peak strength increasing with the in-fluence coefficient of the medium principal stress.Volumetric strain exhibits an initial shrinkage followed by expansion with axial strain,with the maximum shrinkage and expansion increasing alongside the influence coefficient of the medium principal stress.Furthermore,we derive and in-corporate the finite difference scheme of the elastic-plastic constitutive model into Flac3d numerical software,verifying its effectiveness through a single element simulation.In the context of global warming,these research findings are poised to offer a theoretical and numerical foundation for predicting glacier stability.关键词
冰川稳定性/本构模型/多晶冰/数值模拟Key words
glacial stability/constitutive model/polycrystalline ice/numerical simulation分类
天文与地球科学引用本文复制引用
张革,刘星炎,刘恩龙..基于三剪统一强度理论的多晶冰软化本构模型研究及应用[J].工程科学与技术,2024,56(3):90-98,9.基金项目
国家自然科学基金(U22A20596) （U22A20596）
兵团青年科技创新人才科研启动基金(2023CB008-28) （2023CB008-28）
宜昌市自然科学研究项目(A23-2-007) （A23-2-007）
