The undisturbed loess has special structural.In engineering,foundation settlement and foundation pit re-bound are directly related to its compression-rebound characteristics.To reveal the influence of the loess structure on its compression rebound characteristics,taking two different depths of Q3 loess in an area of Xi'an as the research ob-ject,experiments were conducted on the compression-rebound characteristics of undisturbed,remolded and saturated undisturbed loess.The compression-rebound-recompression-rebound curves of undisturbed loess were obtained.The variation law of structural indexes in the process of compression-rebound of loess was analyzed,and the influence of lo-ess structure on compression and rebound coefficients was revealed.The results indicate that when the load does not exceed the maximum load in the early stage,the compression coefficient decreases with an increase in structural index,and increases with the increase of structural index after exceeding.When the load reaches the structural yield stress,the structural indicators for the loess compression-rebound process are at their maximum,and the compression coeffi-cient also reaches its peak,followed by a decrease in both.The rebound coefficient increases with the decrease of the structural index,and different loess exhibit a similar relationship between the rebound coefficients and structural inde-xes,indicating that the compression and rebound coefficient of loess are controlled by its structure.
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