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黄土是典型的结构性土,微结构控制其力学性能和强度要求。通过黄土震陷实验和微结构电镜扫描实验,应用统计细观损伤力学深入研究了考虑微结构要素的黄土震陷的内在破坏机理,得到了黄土震陷的结构损伤模型和本构关系。将计算结果与实验结果进行了比较,结果表明,应用统计细观损伤力学研究黄土震陷机理具有较高的合理性,黄土震陷主要是由其独特的架空孔隙结构破坏和土体颗粒掉入孔隙所致,与其动应力状态和孔隙分布有很大关系。
Loess is a typical structural soil, microstructure control its mechanical properties and strength requirements. Through the loess seismic subsidence experiment and the microstructure scanning electron microscopy experiment, the intrinsic failure mechanism of the loess seismic subsidence considering the micro-structural elements is studied by using the statistical meso-damage mechanics. The structural damage model and the constitutive relationship of the loess seismic subsidence are obtained. The results of calculation and experimental results are compared. The results show that the application of statistical meso - damage mechanics to study the loess subsidence mechanism has high rationality. The loess subsidence is mainly caused by its unique damage of overhead pore structure and the falling of soil particles Pores caused by its dynamic stress state and pore distribution has a great relationship.