Large diameter (>0.75 m) excavated by hand or mechanical belling tool. increase end bearing area in cohesive soils. Geotechnical failure modes: bottom heave (in soft clay) or sidewall collapse (use bentonite slurry or casing).
: Drives a sampling tube into the ground to measure "N-values," which indicate soil density and bearing capacity. Cone Penetration Test (CPT) Large diameter (>0
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