红粘土微观结构模型及其工程力学效应分析

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。

Study of Micro-structure Model of Red Clay and Its Engineering Mechanical Effect

The "set grain"structure model of red clay is proposed based on the principle of structure and function of material.,the microstructure modeling method is discussed in this paper.The model is used to analyze,explain and predict the physical and mechanical characteristics of red clay theoretically,at the changes of influencing factors such as the water content,the iron content in red clay,profile location and external loads.To verify the theoretical results by triaxial compression tests with controlled sampling in the section,The fitting curves,optimum critical water content and critical iron content are obtained from the test data,and compared with the results of relevant model test,numerical simulation results and engineering experience.Theoretical analysis and experimental results show that the mechanical properties of red clay is closely related to the water content and iron content,and the proposed model can reasonably explain the micro mechanics of red clay in accordance with the micro-structure,so it can reflect the macro mechanical effects on engineering of the physical and mechanical mechanism of red clay favorably.