| Summary: | 碩士 === 國立中央大學 === 土木工程學系 === 86 === In this research, dynamic compaction model tests in circular
chamber and triaxial tests were conducted to investigate the
influences on soil mechanicalbehaviors under dynamic
consolidation method. Using dynamic compaction modeltests in
circular chamber, relations of the variation of dynamic impact
stress with depth at impact center is obtained through changing
the conditions ofcompaction. The effective depth of improvement
predicted by the formula ofimpact load and the relation of
dynamic impact stress and depth as mentionedbefore. From the
analyzing results of Mailia case, this prediction method has
considered the differences of soil layers between in-situ and
lab tests. Aftersome modifactions, a good prediction result is
obtained. Besides, from the results of triaxial tests, it is
known that the consolidation settlements ofsoil reached the
maximum value at the moment of impact, and it increases withthe
magnitude of impact pressure. This results matched with the
function ofcomplete major consolidation settlements in short
time as dynamic consolidation method is applied. After the
treatment of impact, the strength of soil increasesdistinct with
the impact pressure, but the increment of impact pressure has a
limit which depends on the value of the consolidation pressure
on the soil bodyand the degree of absorbing impact energy.
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