Abstract
The application case of dynamic compaction (DC) is realized in highway. In this paper, the in situ tests for evaluating effectiveness of DC are performed on a liquefiable soil and soft soil interbedding foundation encountered in highway engineering practice. Excess pore pressure, total surface settlement and lateral deformation under DC impact are measured and analysed. The cone penetration test (CPT) and spectral analysis of surface wave (SASW) are used for investigating the compaction effectiveness. The formulation of the predicting improvement depth of the DC is presented according to the pseudo-static mechanics method and is of obvious meaning of soil mechanics compared with Mendard’s formulation. The calculating results of the formulation of improvement depth of the DC are agreement with the measuring results. The investigation results indicate that the DC technique is an effective way for improving liquefiable soil and soft soil interbedding foundation in highway engineering practice.
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