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根据物质系统的结构功能原理,探讨了红粘土微观结构模型的构建方法,提出红粘土微观“集粒”结构模型。采用该模型对红粘土在含水量、含铁量、剖面位置等影响因素的变化和外荷载作用下的工程物理力学特性进行了理论分析、解释和推测。通过剖面分层控制取样进行室内三轴压缩试验对理论分析结果进行验证,由拟合曲线得到红粘土的相对最佳含水量、临界含水量和临界含铁量,并与相关模型试验、数值模拟结果和工程经验进行对比分析。理论分析和试验结果表明,红粘土力学特性与含水量、含铁量相关程度高,模型能够从微观角度合理解释红粘土的宏观工程力学性质,较好地反映红粘土宏观工程力学效应的微观物理力学机理。
According to the structure and function principle of the material system, the construction method of the microstructure model of red clay is discussed, and the microscopic “set grain ” structure model of red clay is proposed. The model was used to make a theoretical analysis, explanation and speculation on the change of the influencing factors of red clay, such as water content, iron content, section location and the engineering physical and mechanical properties under the external load. The results of the theoretical analysis were verified by the sample stratified control sampling, and the relative optimum moisture content, critical moisture content and critical iron content of the red clay were obtained from the fitting curves. The results were compared with the related model tests, numerical simulation Results and engineering experience for comparative analysis. Theoretical analysis and experimental results show that the mechanical properties of red clay have a high degree of correlation with water content and iron content. The model can reasonably interpret the macroscopic mechanical properties of red clay from a microscopic point of view, and better reflect the microscopic physical properties of red clay, Mechanics.