Influence of compaction conditions and fines content on the dynamic strength of compacted soil

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (14) : 125-130.

ZHANG Xiaojun

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Abstract

To further study the compaction conditions and fines content coupling effect on soil dynamic strength characteristics, a series of cyclic loading tri-axial tests were carried out on five kinds of compacted soil of Hunan province with different gradations.The influence and corresponding mechanism of the moisture content, dry density and saturation on the undrained dynamic strength were discussed.The discrepancy of dynamic strength characteristics caused by fines content difference was analyzed.And a function with compaction degree and saturation degree as independent variables was introduced to quantitatively express the dynamic strength.The results show that under a certain compaction energy, soil with maximum dry density may not reach the maximum undrained dynamic strength.For the soil with high fines content, its dynamic strength is determined by both the compaction and saturation degree, while for the soil with low fines content, its dynamic strength is only affected by the compaction degree.The undrained dynamic strength of compacted soil can be estimated by the function without knowing compaction curves.Meanwhile, the compaction degree needed for achieving the target undrained dynamic strength can be calculated by controlling the saturation degree.

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compacted soil / cyclic loading tri-axial test / dynamic strength / optimum moisture content / maximum dry density / fines content

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ZHANG Xiaojun. Influence of compaction conditions and fines content on the dynamic strength of compacted soil[J]. Journal of Vibration and Shock, 2019, 38(14): 125-130

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