Back Analysis Of The Loess's Nonlinear Model And The Application Of Cellular Automata Theory On It

Back analysis of parameters in Geotechnical engineering has developed for a long time. With the development of modern construction, the research and application of back analysis of nonlinear problems have been paid more and more attention by researchers.In this paper, Duncan-Chang parameters can be identified from P-S curves, which are got from loading tests either one point in the same depth or two points in the different depths in field. By the secondary development of ANSYS software, it has achieved calculation of Duncan-Chang model in the ANSYS. At the same time, field loading tests are numerically simulated by ANSYS. It is proved to be feasible of this method by the comparison of numerical results and tests datum. And it can provide a new idea: according to the datum of yield loading tests, parameters of the loess nonlinear model can be determined. Therefore we can forecast the loess mass's deformation and settlement more accurately.In the last years, cellular automata, a system of nonlinear science ,is widely applied and developed in many fields such as economic,biology,geography and so on. From the energy point , on the base of binary medium model proposed by academician Shen Zhujiang , binary medium cellular automata model has been established to simulate the properties and the failure process of loess by combining with FEM from meso-mechanics scope in this paper. The dramatic characteristic of this model is: the energy of failure cell is distributed into three parts which are expended energy, residual energy and energy transferred to neighbor cells. Concerning cellular automata—a front field of complex science, much disadvantages will need to be modified, although a few has been discussed in the paper. However, it also presents a new approach to research the failure characteristic of loess.