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1 问题的提出 密实砂、超固结土等材料在应力应变关系曲线上有明显的峰值 ,当应力小于峰值强度 ,在起始阶段表现为弹性状态 ,然后逐渐屈服 ;到达峰值后 ,应力随变形的增大而降低 ,这称为应变软化现象。著名学者Ｐｒｅ ｖｏｓｔ和Ｈｕｇｈｅｓ提出在应变软化范围内 ,由于应力增
1 PROBLEM PROBLEMS Materials such as solid sand and overconsolidated soil have obvious peaks in the stress-strain curve. When the stress is less than the peak intensity, they show elastic state in the initial stage and then gradually yield. When the peak value is reached, the stress changes with deformation Of the increase and decrease, which is called strain softening phenomenon. The famous scholar Pre vost and Hughes proposed in the strain softening range, due to stress increase