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Abstract The shear strength parameters of rockfill material are the main factors in calculation of dam stability against sliding，thus shear tests of rockfill materials should be conducted for all the rockfill dam projects. In order to further obtain the exact parameter values，regularity and main effective factors of shear strength，according to the classification of weathering degrees of the rockfill materials and with the method of data statistical analysis，this paper provides a statistical analysis on the shear strength parameters and regularities of rocks，crushed gravel soil and sandy pebble soil taken as main rockfill，secondary rockfill，cushion，and transition materials based on the test data of 101 specimen groups from 7 projects designed by HydroChina Beijing Engineering Corporation. Further analysis is made on the effects of immersion saturation，compaction，grain gradation(＜5 mm content)，roundness，weathering degree，and lithology to the shear strength parameters of rockfill materials. The result shows that the effect of weathering degree of rockfill material on the shear strength parameters is the most obvious，other effects are in different degrees.
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Received: 20 May 2013
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2014, Vol. 33 
