Xiaonong, Luo creator Shibuya, Satoru Chairperson Balasubramaniam, A.S. Examination Committee Kohgo, Yuji Examination Committee text series technical report th Bangkok Asian Institute of Technology 1997 continuing eng 115 leaves : ill. + 1 online resource Applicability of a new model for stress-strain non-linearity behavior of geomaterials, Double Exponential Fitting Model (DEFM), is studied in depth by examining its modelling capability of fitting the observed experimental data of various geomaterials over a wide range of strain. The detailed examinations are made for the results of UC and CU tests of three geomaterials, cement-treated sandy soil, mudstone and reconstituted clay. The emphasis of examination is laid on the influence of the known points on the determination of model parameters together .lwith the fitting accuracy. Similar examination is also made for the comparison ofDEFM with other existing models. The appraisal of the fitting is carried out in a quantitative manner. The results show that DEFM is effective in modelling non-linear behaviour of different geomaterials over a wide strain range in both stiffness-stress relationship and stress-strain relationship as long as the known fitting points are appropriately selected. Some criteria for choosing the fitting points in both two point fitting method and three-point fitting methods are proposed. The application of DEFM to the behaviour of stiffer geomaterials show higher degree of the fitting accuracy than those for softer geomaterials. It is found that DEFM is advantageous in modelling non-linear stress strain behaviour of geomaterials over a wide strain range as compared with other existing models. A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Civil Engineering Thesis (M. Sc.) - Asian Institute of Technology Strains and stresses Mathematical models Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B13525 http://203.159.5.9/ait-thesis/detail.php?q=B13525 970807 20260818155556.0