摘要
为揭示含粗粒滑带土细观参数的变化对其宏观现象的影响规律,通过可视化直剪仪对含粗粒滑带土进行宏观力学特性试验,采用颗粒流对含粗粒滑带土剪切过程进行了数值模拟,并通过位移矢量场、颗粒接触力链、内部大小主应力、组构等细观参量的演化分析其细观力学特性.研究结果表明:含粗粒滑带土的受力骨架在直剪的不同阶段会发生重分布和重构造,试样由初始的各向同性向各向异性转变直至发生变形破坏,其剪胀性和应变硬化特性是粗细颗粒之间细观接触力的宏观表现.研究结论可为土质边坡加固和滑坡灾害的科学防治提供理论依据.
In order to reveal the change of mesoscopic parameters on macroscopic phenomena of coarse-grained slip zone soil,a direct shear apparatus with the visual shear box was used to explore the macroscopic mechanical properties of the slip zone soil.Moreover,the Particle Flow Code(PFC)was used to simulate the shear processing of coarse grained slip zone soil,and the meso-mechanical properties were analyzed by tracking the evolution of meso-mechanical parameters such as displacement vector field,particle contact force chain,internal principal stress and fabric.The results show that the stress skeleton of the soil would be redistributed and reconstructed at different stages of the direct shear,and the sample is changed from initial isotropy to anisotropy until a deformation failure occurs.The characteristics observed of the shear dilation and strain hardening are the macroscopic manifestation of the mesoscopic contact forces between the coarse and fine particles.The results can provide theoretical basis for soil slope reinforcement and scientific prevention and control of landslide disaster.
作者
李泽闯
刘志斌
程培峰
张昊
蔡启源
LI Zechuang;LIU Zhibin;CHENG Peifeng;ZHANG Hao;CAI Qiyuan(School of Civil Engineering,Northeast Forestry University,Harbin 150040,China)
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2022年第2期121-129,共9页
Journal of Liaoning Technical University (Natural Science)
基金
黑龙江省自然科学基金(LH2019D001)
关键词
滑带土
粗颗粒
可视化剪切
颗粒流
力学特性
细观分析
slip zone soil
coarse particles
visual shear test
particle flow code
mechanical properties
meso-analysis
作者简介
李泽闯(1990-),男,吉林白城人,博士,讲师,主要从事岩土工程与交通运输工程方面的研究;通信作者:刘志斌(1997-),男,河南太康人,硕士研究生,主要从事岩土工程数值分析方面的研究.
