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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。
From the microscopic point of view, the failure mechanism of the gravel cushion in the composite foundation is studied. Combined with the theoretical analysis and analysis, indoor model test and particle flow numerical simulation are used to analyze the movement of the bedding particles in the process of pile socketing The simulation, indoor test using CCD tracking and digital speckle correlation technology, numerical simulation using discrete element particle flow method. The process of transition from the Terzaghi failure mode to the Mandel-Salencon failure mode is simulated and analyzed, and the macroscopic characteristics of the composite foundation gravel cushion are explained from the microscopic point of view.