Responses of Dynamic Penetrometers according to Hammer Weight and Drop Height
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The purpose of this study is to characterize the dynamic responses with respect to hammer weight and drop height in dynamic penetration tests. The tests using an instrumented dynamic cone penetrometer (IDCP) were conducted to obtain the dynamic responses during penetration. The various types of hammer weight and drop height under fixed potential energy (45.1 N∙m) were used. The measured compression stresses and transferred energies at rod head and cone tip were analyzed according to the hammer weight and drop height. Compression stress at the rod head varies with hammer weight and drop height, while compression stress at the cone tip is irrelevant with hammer weight or drop height. In addition, transferred energies into the rod head and cone tip increase as the hammer weight increases, whereas those decrease as the drop height increases. This study demonstrates that hammer weight and drop height should be considered when the characteristic of subsurface is profiled using dynamic penetrometer.