Abstract: To utilize the vertical bearing capacity of deep diaphragm walls in actural projects,the preliminary analysis of vertical bearing behaviors,fitting of load-settlement curves with the Yushi growth model,and prediction of ultimate bearing capacity of deep diaphragm walls are carried out.It is found that the bearing performance of the single deep diaphragm wall is better than that of the circular pile with the same volume.Fitting results of 6 field measurement data with the model show that the fitting precision is high,and the fitting effect with the model is better than hyperbolic and exponent models,especially at the tails of fitting curves.Conclusions can be drawn that the vertical bearing capacity of deep diaphragm walls should be utilized adequately;the Yushi growth mathematical model has good adaptability and is accurate and credible for fitting of load-settlement curves of deep diaphragm walls;and corresponding fitting equations can be used to forecast vertical bearing capacity of deep diaphragm walls.