The fastest way of inserting the blade, if the soil is penetrable, i.e. obstacle-free, is using a 10 ton or 20 ton penetrometer.

Truck mounted penetrometers are very effective, but anchored penetrometers, less expensive, are also conveniently used. The advancing speed may be 2 cm/sec, as in the CPT, but speeds twice or half the 2 cm/sec are adequate because , unlike CPT, the penetration is just a means of advancing the blade, the real test occurs later.

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