【摘要】 通过分析黄土动力变形研究的进展状况,概括已有研究的主要切入点和存在的问题,结合黄土动力变形研究对厘清其物理过程与力学机制的需求,提出未来取得突破的可能方向.分析结果显示:已经开展的相关研究工作,基本以动三轴试验作为关键基础数据来源,将分析土体物性参量、动荷载类型和微观结构特征等因素的影响作为切入点,在各类影响因素的相互制约方面未能给予足够考虑;少量基于物理力学机制的工作,虽对关键影响参量以及其间关联作了较好分析,但在理论化、定量化方面仍嫌薄弱;未来的研究中,定量刻画动荷载作用于土体的加载效应、固相动力响应与其宏观结构强度的定量关系、水气两相复合势能动力累积规律和场地边界条件对土体初始应力状态的影响等,应是值得关注的获取实质性突破的可能方向.更多还原

【Abstract】 The research progress in dynamic deformation of loess was first analyzed and the train of thought and the deficiency in the existing results were summarized. Then the requirements for dynamic mechanisms were discussed to comprehend the physical process and mechanical mechanism of loess deformation under dynamic loading. Finally we proposed several breakthrough points for research into the dynamic deformation of loess in the future. The analyzed results showed that for the existing arts, the dynamic triaxial test in laboratory is the main approach to investigating the loess deformation under seismic loadings. Based on the laboratory data, these studies attract more attention to the dynamic deformation features influenced by three aspects,i.e. the physical properties of loess, types of dynamic loadings and microstructural characteristics of the soil.Almost all researches have failed to consider the interaction between different factors and this has led to the main constraints on the rationality and applicability of relative results. A few studies, fortunately, have applied the physical-mechanical mechanism and obtained better results from the analysis of critical influence parameters and the correlation between them. But these results are still preparatory and further efforts are needed in the theorization and quantification of the essential laws concerning dynamic loess deformation. According to above analysis, we believe that for future research on dynamic loess deformation, the theoretical description of the loading effect caused by the ground motion on loess, the quantitative relation between the dynamic response of solid-phase and the macro structure strength of loess, the dynamic development laws of composite potential energy of air and water phases, and the influence of boundary conditions in field on initial stress state of loess,etc, should be the noteworthy breakthrough spoints to consider.更多还原