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Abstract The correcting coefficient for rod length in dynamic penetration test depends on the transmission of the axial impacting force and the impacting energy of hammer from the top to the bottom end of the rod after the hammer impacted the rod top. Four test schemes with the rod lengths of 22.92，25.87，40.92 and 46.85 m respectively were designed and six monitored points were arranged along the axis of the rod. The heavy dynamic penetration tests were carried out at two sites in Wuhan，one at Yaogou village near South Lake and another at the cofferdam in Yangluo. The whole strain processes of every monitored point were measured with the dynamic strain gauge. Subsequently，the axial impacting force of the every monitored point was calculated and the hammer impacting energy was obtained with F2 method based on the wave mechanics. The temporal and spatial distributions of the axial impacting force and the impacting energy of hammer along the rod were studied thoroughly. The formulations of the axial impacting force and the hammer impacting energy with the rod length were established，which were consistent with existing research results.
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2016, Vol. 35 
