DPT test accurately predicts gravel liquefaction, improving hazard evaluations.
Gravel liquefaction in earthquakes is hard to predict, especially in gravelly soils. A new test called the Chinese Dynamic Cone Penetration (DPT) can help assess liquefaction risk in gravelly soils more accurately than traditional tests. By studying sites in Alaska where gravel liquefaction occurred in the 1964 earthquake, researchers found that the DPT test can predict liquefaction potential with good accuracy. The DPT test results were similar to those from the Standard Penetration test (SPT) after adjusting for energy differences. This means the DPT test is a cost-effective and reliable way to evaluate liquefaction risk in gravelly soils. Additionally, using shear wave velocity measurements specific to gravelly soils can better predict liquefaction compared to existing methods designed for sandy soils.