碎石垫层破坏模式细观机理分析  

Meso-scale mechanism analysis of failure modes of gravel cushion

作　　者：赵学亮[1] 朱小军[1] 霍少磊[1] 陈辉[1] 

机构地区：[1]东南大学土木工程学院,江苏南京210096

出　　处：《岩土工程学报》2013年第S2期1159-1162,共4页Chinese Journal of Geotechnical Engineering

基　　金：国家科技支撑计划项目(2011BAG07B01);国家自然科学基金项目(51079030);国家"973"计划(2013CB036304)

摘　　要：从细观角度对复合地基中碎石垫层的破坏机理进行了研究,结合理论研究分析,采用室内模型试验与颗粒流数值仿真两种方法对桩体上刺过程中垫层颗粒的运动变化进行了模拟,室内试验采用CCD跟踪拍摄及数字散斑相关技术,数值仿真采用离散单元颗粒流法。分析模拟了碎石垫层的破坏模式从Terzaghi破坏过渡到Mandel-Salencon破坏模式的过程,从细观角度对复合地基碎石垫层的宏观特性进行了解释。The failure modes of the gravel cushion in the composite foundation are studied from the viewpoint of meso-scale. Combined with the theoretical analysis, laboratory experimental tests and numerical simulations are employed to track the particle movement of the cushion during the upward penetration of the pile. The CCD tracking shot and digital speckle correlation technique are used for the laboratory experiments. And the discrete element method is used for the numerical simulations. The results show the development of the failure from the Terzaghi mode to the Mandel-Salencon one. Macroscale characteristics of the gravel cushion are investigated and explained from the meso-scale viewpoint.

关 键 词：室内模型试验 颗粒流 数值模拟 垫层破坏模式 

分 类 号：TU470[建筑科学—结构工程]