结构性土坡变形破坏数值模拟方法的对比分析  

Comparative analysis on numerical simulation of methods used in structural soil slopes

作　　者：汪儒鸿 周海清 彭国园 WANG Ruhong;ZHOU Haiqing;PENG Guoyuan(Department of Architectural Engineering, Logistical Engineering University of PLA, Chongqing 401331, China;Northwest Nuclear Technology Institute,Xi＇ an, Shaanxi 710024, China)

机构地区：[1]陆军勤务学院军事设施系,重庆401331 [2]西北核技术研究所,陕西西安710024

出　　处：《中国地质灾害与防治学报》2018年第3期47-52,共6页The Chinese Journal of Geological Hazard and Control

基　　金：国家自然科学基金项目(41272356)

摘　　要：结合现有对结构性土的认识及边坡稳定性方面的研究,分别对有限元和离散元数值模拟方法在研究结构性土坡稳定性方面的适用性进行了分析。通过在数值模拟过程中对土体强度变化、边坡失稳特征等多个因素的分析比对,得出了以PFC2D为代表的离散元软件更能有效模拟出结构性土强度的非线性变化以及结构性土坡全程失稳规律的结论。对结构性土坡失稳破坏的全程PFC2D模拟观察到结构性土坡具有失稳突然、灾前位移变形较小的破坏特点。同时,离散元分析方法更能直观地反映出土颗粒微观结构的改变对结构性土坡失稳特征的影响。Based on the existing understanding of structural soil and slope stability,the applicability of numerical simulation methods of finite element method and discrete element method in studying the stability of structural soil slope are analyzed respectively. Through analyses and comparisons of soil strength changes,slope instability characteristics and other factors during numerical simulation,it is concluded that the PFC^2D particle discrete element software can more effectively simulate the nonlinearity of soil strength change and whole process failure law of structural soil slopes. Through the full PFC^2D simulation of the instability of the structural soil slope,it is observed that the structural soil slope has the characteristics of sudden failure and small deformation before the disaster. At the same time,the method of discrete element analysis can more intuitively reflect the influence of the change of microscopic structure of soil particles on the failure characteristics of structural soil slopes.

关 键 词：结构性土坡 边坡稳定性 离散元 有限元 数值模拟 

分 类 号：P642[天文地球—工程地质学]