基于颗粒堆积模型的膨胀土结构膨胀机制  

EXPANSION MECHANISM OF EXPANSIVE SOIL STRUCTURE BASED ON PARTICLE PACKING MODEL

作　　者：郭永春 刘家志 尤安俊 赵峰先 闫圣龙 GUO Yongchun;LIU Jiazhi;YOU Anjun;ZHAO Fengxian;YAN Shenglong(School of Earth Science and Environmental Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学地球科学与环境工程学院,成都610031

出　　处：《工程地质学报》2025年第1期58-65,共8页Journal of Engineering Geology

摘　　要：针对膨胀土吸水膨胀前后结构状态变化的试验现象,提出了膨胀土结构膨胀的观点。通过对膨胀土结构的适当简化,基于颗粒堆积理论,建立了膨胀土结构膨胀的理想化颗粒堆积模型。通过对角锥堆积等5种理想堆积结构的几何分析和数学推导,建立了从土颗粒到土体的跨尺度膨胀变形方程,讨论了吸水膨胀前后颗粒堆积结构变化对土体膨胀变形的影响规律。基于膨胀土结构膨胀的颗粒堆积模型和膨胀变形方程,阐释了从土颗粒到土体的结构膨胀机制。In view of the experimental phenomenon of the structural state change of expansive soil before and after water-swelling,we put forward the viewpoint of structural expansion of expansive soil.Through proper simplification of expansive soil structure,based on particle accumulation theory,we established an idealized particle accumulation model of expansive soil structure expansion.Through the geometric analysis and mathematical derivation of five ideal stacking structures including pyramid stacking,we established the cross-scale expansion deformation equation from soil particles to soil,and discussed the influence of particle stacking structure changes before and after water-swelling on soil expansion deformation.Based on the particle packing model and expansion deformation equation of expansive soil structure expansion,we explained the structural expansion mechanism from soil particles to soil.

关 键 词：颗粒堆积 结构膨胀 膨胀机理 土颗粒 膨胀土 

分 类 号：P642.3[天文地球—工程地质学]