The 'dynamic probing test' (DPT) is used in the field to assess:
Choose the correct answer
Permeability of clay layer
Continuous soil resistance profile — blow count per 10 cm gives relative density/strength variation with depth
Chemical composition of soil
Swelling pressure of clay
Correct Answer
B. Continuous soil resistance profile — blow count per 10 cm gives relative density/strength variation with depth
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Dynamic probing: cone driven by falling hammer (similar to SPT but continuous driving without SPT tube). Types: DPL (Light), DPM (Medium), DPH (Heavy), DPSH (Super Heavy). Measures blow count N10 per 10 cm penetration. Gives continuous resistance profile vs depth (unlike SPT at 1.5 m intervals). Suitable for: sands, silts, soft cohesive soils. IS 10187 covers dynamic cone penetration test (DCPT).
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