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本文探讨了将土静力强度和稳定分析中广泛采用的极限平衡理论应用于饱和砂土动力失稳过程分析的可能性和途径。作者以动三轴试验研究为基础,考虑到往返动荷作用的特点,提出了瞬时极限平衡的概念,分析论证了动力失稳过程中极限平衡的两个特征点、三个发展阶段和抗剪强度包线的特点,建立了以瞬时极限平衡理论为基础的饱和砂土液化机理的观点。
This paper discusses the possibility and approach of applying the limit equilibrium theory widely used in soil strength and stability analysis to analyze the dynamic instability process of saturated sands. Based on the dynamic triaxial test study, considering the characteristics of the reciprocating dynamic load, the concept of instantaneous limit equilibrium is put forward. The two characteristic points, three development stages and shear resistance of the limit equilibrium in the process of dynamic instability are analyzed and demonstrated. With the characteristics of strength envelope, the viewpoint of the liquefaction mechanism of saturated sand based on instantaneous limit equilibrium theory was established.