ELASTOPLASTIC COUPLED ANALYSIS OF BURIED STRUCTURE AND SOIL MEDIUM BYPERTURBATIONAL SEMIANALYTIC METHOD

In this paper, an effective numerical method for physically nonlinear interaction analysis is studied, in which the elasto-plastic problem o f coupled analysis between the structure and medium may be transformed into several linear problems by means of the perturbation technique, then, the finite strip method and finite layer method are used to anal yze the underground structure and rock medium, respectively, for their corresponding linear problems, so the purpose of simplifying the calc ulation can be achieved. This kind of method has made use of the twice semi-analytical technique: the perturbation and semi-analytic solutio n function to simplify 3-D nonlinear coupled problem into 1-D linear n umerical one. In addition, this method is a new advance of semi-analyt ical method in the application to nonlinear problems by means of combi nating with the analytical perturbation method, and it is also a branc h of the perturbational numerical method developed in last years.