The 'cone penetration test' (CPT, IS 4968 Part 3) is used to:
Choose the correct answer
Only collecting undisturbed samples
Continuous vertical profile of soil resistance (qc, fs) for stratigraphy, strength, and pile capacity estimation
Measuring groundwater table only
Rock quality designation (RQD)
Correct Answer
B. Continuous vertical profile of soil resistance (qc, fs) for stratigraphy, strength, and pile capacity estimation
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CPT: static cone (60° tip, 10 cm² area) pushed at 2 cm/s. Measures: cone tip resistance qc (MPa), sleeve friction fs, pore pressure u (for CPTu/piezocone). Continuous profile with depth. Derives: soil type (from friction ratio Rf = fs/qc × 100%), relative density of sand, undrained shear strength of clay, pile capacity, liquefaction potential. Faster and more continuous than SPT.
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