Abstract
This paper describes an analytical theory and method to compute the nonlinear surface ground motion by using a real restoring force. A surface ground motion is mathematically expressed in a wave propagation equation or vibration equation. A restoring force function of soil is given in mathematical model. The most important point of the analytical method suggested in this paper is to use real restoring force for a shearing stress necessary for calculation. The authors don't use a mathematical model but a physical model to represent a restoring force characteristics of soil. The analytical apparatus is a micro-computer connected a dynamic triaxial soil testing machine. We have got the nonlinear response characteristics of surface ground motion in liquefaction process.
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