ABSTRACT
This paper presents the results of an experimental investigation performed to study the failure criterion of strain for natural and remolded clay from Xiaoshan under cyclic loading. The strain curves with cycle number of natural and remolded clay have all turning points under different amplitude of stress. The strain of turning points would be different if the stress amplitude change but they could be fitted well by a linear formula. The appearance of turning points means the failure of clay's structure. It'd better determine the failure criterion according to the failure of soil's structure.
