Dynamic Compaction Method Used to Consolidate the Multilayer Backfilled Foundation of Oil Tank

There are three kinds of methods in consolidating the backfill of oil tank foundation, that is, rolling, piling, and dynamic compaction. The dynamic compaction method is widely adopted in consolidating the foundation of building or oil tank. This method is effective, convenient and can save much time and materials in the construction. The key technical indexes of the method include consolidating depth, mono-beaten energy, times of beat, compacting times, and interval of compacting points. Taking the construction of multilayer backfilled foundation for a 100000 m³ oil tank in Qinhuangdao as an example, the paper introduces the application of this method: first, working out a test program according to the initially determined parameters; selecting one or several test areas on the typical site to make trials; measuring the test areas after one or several weeks of the trial in accordance with different soils and comparing the initial compacted data; last, verifying the compaction with these data and determining the suitable parameters for the construction. Meanwhile, the paper stresses on some issues which is needed to be paid attention to in the construction.