| Due to the complex of dynamic compaction and many uncertain factors existed in ground, the study and design of dynamic consolidation method mainly depended on analogy and experience in past. Consequently, it is important to find a rational way to study dynamic consolidation method.On the basis of the research of application development, strengthening mechanism, designing and construction, and quality inspection of dynamic compaction method, the different area engineering data of adopting dynamic compaction method treatment of collapsible loess in HeBei province is collected. These data includes laboratory test data, in-situ measurement data (including field plate load test, pressuremeter test, standard penetration test, light sounding test, static cone penetration test etc). Contrasting simulation the experimental data before and after dynamic compaction, the reasonable designing and construction parameter of dynamic compaction method are proposed; The consolidation effect of collapsible loess after dynamic compaction is analyzed, the reasonable calculation method of subgrade bearing capacity is presented also. Adopting the formula recommended in this dissertation to calculate subgrade bearing capacity after dynamic compaction, the calculated results agree well with those measured. It is indicated that influence distance of dynamic compaction is within 5~6m when hammering energy is within 1500~2600kN·m. |
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