Abstract On the basis of energy conservation during the collapsible process of loess，a relation between pressure and collapse speed during collapse of loess was built. The model parameters and the curves of the relation were obtained by experiment. Based on the model and the curve，the obtained conclusions are：the higher pressure is，the higher collapsible speed is；the larger quantity of collapse is，the larger collapse pressure of origination is，and the collapsible speed has the character of salutation.
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Received: 08 November 2003
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