ANALYSIS AND BACK ANALYSIS MODEL OF 3—D DISPLACEMENT FIELD OF CONCRETE DAMS

Based on the field theory and mechanical analysis,the author presents a new method to build a 3-D displacement field of dam body,dam base and the whole river-bed from analysis and back analysis model.It presents a method to feedback the partial and whole distortion parameters of the dam body,the dam base and the river-bed when ever the factors correlate or not.The above theory and method were applied in Long Yang Xia project,and it successfully explained the cause of doubtful distortion point during the dam's operational peri-od.