PDC is a new ground investigation device that can evaluate the liquefaction strength in realtimewithout laboratory test.
Compared to the conventional liquefaction investigation by SPTand 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) and low costinvestigation.
It is often used not only for liquefaction investigation, but also fordetermining the effects of groundimprovement.

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