【摘要】 基于重正化群理论在临界突变问题分析中的优势和岩土体的自相似特性,从海床土微观结构入手,引入三维颗粒堆积模型来描述孔隙渗流临界行为,找到了土体渗流与临界孔隙率的关系,给出了海床介质孔隙率与渗流发生的物理判别准则。在土体二元介质理论基础上,分析了饱和海床土宏观液化与微观强度的定量关系,构建了海床土体微单元破坏的重正化群模型,并对结构面断裂损伤临界概率进行了研究。研究结果表明:海床土液化是渗流-应力耦合场共同作用的结果,微单元体断裂损伤导致液化贯通带形成,进而引起海床土的宏观液化,液化贯通带的提出对研究海床土液化破坏规律有极其重要的意义。更多还原

【Abstract】 With the advantage of renormalization group theory in critical mutation analysis and the self-similar characteristics of soil materials,the critical behavior of pore percolation and the relationships between seepage and critical porosity were found. In this paper,the critical behavior is described by the three-dimensional particle packing model from the microstructure of seabed soil. Specifically,the physical criterion is given to judge the seepage conditions associated with seabed medium porosity. Based on the binary medium theory,the quantitative relationship of macro-liquefaction and micro-strength of saturated seabed soil is analyzed. At the same time,the microbalance unit damage renormalization group model of seabed soil is built,and fracture damage critical probability of structural surface is studied. The results showed that the seabed soil liquefaction results from the interaction of seepage and stress coupling field. The formation of liquefied rupture band as a critical state is resulted from fracture damage of the micro unit cell,which leads to the macroscopic liquefaction of seabed soil. The soil liquefied rupture band method is important for the study of liquefaction failure regularity of saturated seabed soil.更多还原