Heavy-Duty Dynamic Penetration Test

(1) Before penetration, the probe frame should be installed stably, keeping the probe hole vertical. (2) When penetrating, the penetrating hammer should be allowed to fall freely with a drop distance of 76 cm. The penetration depth, the penetration weight of a burst and the corresponding number of hammers should be recorded in time (usually 5 strokes are a burst) and each The measured number of hits N penetrated 10 cm. (3) When the length of the probe rod is greater than 2 meters, the number of hammer strokes should be corrected by the following formula.

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