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Equipment damage during SPT

Equipment damage during SPT

Equipment damage during SPT

(OP)
Hi,
we are doing Standard penetration Test for a depth of 35. The rope controlling the hammer gave away after reaching a depth of 22m.

My question is can we still continue with the same bore hole for the remaining depth after the equipment is repaired?

RE: Equipment damage during SPT

Yes.  The rope is just a means to lift the hammer.  It shouldn't impede its free fall. The driller will have to adjust his technique slightly to accommodate the new rope, but they do that routinely.  A new rope has increased friction on the cathead, so the hammer will be easier to lift, initially.  This will cause a tendency to overlift the hammer.

If you have questions, do a stress-wave energy test on the rig using ASTM D4633.  This can be used to compare different drill rigs and operators.

RE: Equipment damage during SPT

And, watch the number of turns the driller has on his cathead.  Should be 1-1/2 if my memory serves me right.

RE: Equipment damage during SPT

BigH...that's right...no more than 2-1/4. (per ASTM D1586, anyway)

RE: Equipment damage during SPT

I don't get it...Why did you think you needed a new borehole?

Also, I do not trust SPT results after a depth of 30m or so...

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