(1. PowerChina Beijing Engineering Corporation Limited，Beijing 100024，China；2. China Water Resources Beifang Investigation，Design and Research Co.，Ltd.，Tianjin 300204，China；3. Yellow River Engineering Consulting Co.，Ltd.，Zhengzhou，Henan 450008，China)
Abstract：The seepage deformation of soil dam(foundation) is a main cause of dam burst and failure，it is therefore necessary to study the seepage deformation of dam(foundation) soil and its types. The data of 472 tests of seepage deformation on noncohesive soil(crushed gravel soil and sandy soil) from 48 projects were collected and statistical analysis was made. The results show that the seepage deformation type of crushed gravel soil is piping；and the type of seepage deformation of sandy soil is soil shifting(flow). Further analysis is made on the distribution curve of grain sizes of the noncohesive soil with Cu≤5 and the seepage deformation type of crushed gravel soil with Cu≤5 was found to be piping.
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2014, Vol. 33 
