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沈珠江等在总结岩土材料的基本特性、分析理论和研究方法的基础上,提出了岩土破损力学理论框架和二元介质模型概念。基于岩土二元介质模型思想,近年来在试验、理论和数值模拟方面对结构性岩土材料进行了详细研究。通过对棒状和棱柱状结构块试件的平面试验,探讨了结构性岩土材料的破损机制,并发现了在受荷过程中结构块逐渐破损并转化为软弱带二者共同抵抗外部作用,即验证了二元介质模型对结构性岩土材料力学抽象的正确性;扩展了岩土二元介质模型对岩土材料的脆性变化进行了模拟,并与结构性土和砂岩的三轴试验结果进行了验证;基于二元介质模型概念,发展了一种模拟岩土材料破损过程的细观数值方法,同时提出了适用于结构性岩土材料的强度准则。
On the basis of summarizing the basic characteristics of geomaterials, analyzing theory and research methods, Shen Zhujiang et al. Put forward the theoretical framework of geotechnical failure mechanics and the concept of binary medium model. Based on the idea of geotechnical binary medium model, structural geomaterials have been studied in detail in recent years in terms of experiment, theory and numerical simulation. Through the plane test on the specimens of bar and prism blocks, the damage mechanism of the structural geomaterials is discussed, and it is found that the structural blocks are gradually damaged and converted to weak bands together to resist the external action The correctness of the binary medium model for the mechanical abstraction of structural geomaterials is verified. The geotechnical binary medium model is extended to simulate the brittleness changes of geomaterials and is compared with the triaxial test results of structural soil and sandstone Based on the concept of binary medium model, a mesoscopic numerical method is developed to simulate the failure process of geomaterials. At the same time, the strength criterion applicable to structural geomaterials is proposed.