Dear Alex,
In my experience, the seating blows are recorded on the drillers' log but
are not reported in the site investigation report. As you suggest, it is
useful extra information which can be used when assessing the validity of
the SPT values observed, particularly when unusual values are seen. I would
say that it is good practice to have that data, but I wouldn't have felt
that the lack of that information invalidated the test result itself.
Regards
David Toll
-----Original Message-----
From: Geotechnical Engineering Email List
[mailto:[log in to unmask]]On Behalf Of Alex Carson
Sent: 02 March 2001 9:58 AM
To: [log in to unmask]
Subject: SPT
In the British Standard for site investigation it states that the initial
penetration of the hammer should be recorded before the start of the test.
The HA (Highway Agency) checking engineer is making statements that "the
site investigation is not in accordance with British Standard " because we
have not recorded the initial penetration. As far as I am aware the value is
not normally recorded unless it is significant. The lowest SPT 'N' is 25 .
I would be grateful for comments from the group.
Alex Carson
Babtie
Telford
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