The 'boring method' most suitable for soft clays and silts (undisturbed sample collection) is:
Choose the correct answer
Hand auger in rock
Rotary/wash boring with thin-wall tube (Shelby/piston) sampler to recover undisturbed samples
Percussion (cable-tool) boring with chisel
Only SPT hammer boring
Correct Answer
B. Rotary/wash boring with thin-wall tube (Shelby/piston) sampler to recover undisturbed samples
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For soft clays/silts: best method is Rotary drilling with thin-wall tube sampler (Shelby tube, push sampler) to get undisturbed samples. Or Wash boring with Shelby tube at required depth. Light cable tool boring (shell and auger) for stiff soils. Core barrel for rock. Piston sampler (Osterberg) for very soft sensitive clays. IS 1892 covers site investigation.
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