A series of undrained cyclic triaxial tests were conducted on coal ash specimens prepared by moist tamping to investigate factors affecting the cyclic behaviour. One-way and two-way cyclic loadings were employed to investigate the effect of stress reversal on forms of cyclic behaviour. The linkage of static and cyclic behaviour of coal ash was investigated by comparing behaviour of replicate specimens under cyclic and monotonic loadings. It was found that there existed a unique critical state line (CSL) for coal ash irrespective of whether the critical state was achieved from monotonic test or post-cyclic shearing. When specimens with initial states at different positions relative to the CSL in e-log(p') were subjected to different types of cyclic loading, plastic strain accumulation and cyclic liquefaction in the forms of cyclic instability and cyclic mobility were observed. Cyclic behaviour of coal ash can be synthesized by the framework of critical state soil mechanics (CSSM).
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