PDC is a new ground investigation device that can evaluate the liquefaction strength in real timewithout laboratory test.

Compared to the conventional liquefaction investigation by SPT and laboratory test,PDCrealizedcompact(work area is less than 6m2, easy to move),detail(data resolution is several cmat depth),quick(1/5 of conventional method) andlow costinvestigation.

It is often used not only for liquefaction investigation, but also for determining the effects of groundimprovement.

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