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Abstract As the control conditions of laboratory test and the basis of numerical analysis for the three indexes，i.e. the density，the gravel content and the maximum grain，the laboratory tests on series large-scale triaxial test are carried out. The results are as follows：(1) the framework action is prominent and the shear strength is mostly influenced by coarse grain，fine grain and the actions of coarse grain and fine grain on earth and rock mixtures；(2) the shear strength of earth and rock mixtures is enhanced with the test dry density increasing，but the interlocking force decreases with the p5 increasing and the maximum grain increasing；(3) because the shear strength value is the minimum when the p5 varies from 50% to 60%，it is advised to control the p5 value varying from 65% to 70% in filling compound embankment which is the optimum range for the p5 value；and (4) because of the shear strength value is maximum when the maximum grain is in the range of 40 mm to 50mm，it is better to control the maximum grain size in this range. Therefore，the condition that the maximum size is over 50 mm should be noted，especially the compaction degree should be strictly controlled.
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Received: 05 June 2007
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