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Abstract The compaction tests of clay mixed with gravels with two kinds of compaction，three kinds of compaction size and eight kinds of gravel-doped amount，were performed to study its granule curve，optimum water content，maximum dry density，broken rate，fines change and so on. The results indicate：the key factors of compaction characteristics of clay mixed with gravel are the size effect，skeleton and gravel-doped amount. The grain grading of clay mixed with gravels tended to be good under the effect of compaction stress；and its optimum water content decreases with the gravel-doped amount increasing；crushing occurs mainly in the range of particle size greater than approximately 0.5 times of the maximum particle. When the proportion of gravel-doped amount less than 60%，the results of 300 compaction under 2 690 kJ/m3 is entirely appropriate as the quality control standards of oversized clay mixed with gravels. For the compactness of oversized clay mixed with gravels，particle size of less than 20 mm could be better reflect the fines changes.
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Received: 18 April 2013
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2014, Vol. 33 
