Dynamic Probing
Dynamic Probing
(OP)
Hi all,
I am looking for information about this testing equipment. Has anyone used it before?
I am interested to find out the manufacturer's address, calibration - conversion to SPT, and case studies been carried out using this equipment .. etc.
Your help would be appreciated.
Cheers
I am looking for information about this testing equipment. Has anyone used it before?
I am interested to find out the manufacturer's address, calibration - conversion to SPT, and case studies been carried out using this equipment .. etc.
Your help would be appreciated.
Cheers





RE: Dynamic Probing
RE: Dynamic Probing
It has only one meaning "it is a test that can repalce the SPT" which is the standard penetration test, widely used for site geotechnical investigations.
Cheers
RE: Dynamic Probing
I'm guessing that MarkDK does not come here very often
Soiledup
RE: Dynamic Probing
you evidently mean dynamic penetrometer but they come in different sizes and fashions (and energies).
The only suggestable one is the one meant by BigH, the DPSH (dynamic penetrometer super heavy) with hi impact energy.
Much used here in Italy, in the Pagani website (one manufacturer) there are studies on efficiency ratio plus correlations with SPT in a couple of test fields.
DPSH (and other dynamic probes) are usually correlated to SPT, which has an average reliability of 25-40%. So, a correlation of another not-too-reliable correlation is bound to be unprecise.
Pagani studies highlight a few weak spots about this device. In my opinion, that's a rare example of scientific honesty coming from a manufacturer!!
RE: Dynamic Probing
http:/
RE: Dynamic Probing
RE: Dynamic Probing
RE: Dynamic Probing
it's not the dinastar, the relevant Pagani link is the following:
http:/
guys around here are using it with decent results, in cohesionless soils, at relatively shallow depths and with a torque sensor.
You might use a casing, but I never heard of it done in practice.
I think this gear is, energy-wise, one step down the Becker hammer or the Japanese Large penetration testing device, they use in gravels.
I would love to see the results from LPT in some familiar gravel layers where the usual dynamic tests yield high or very high blowcounts. Is that friction angle really so much large???
RE: Dynamic Probing
I recently found other sources of information such as the;
http://www.coreprobe.com/
http://w
http://www.aei-euro.com/ingles/mecanica1.htm
Regards
RE: Dynamic Probing
A friend of mine uses one made commercially, paterned after the paper by George Sowers 1959. For some reason his clients think it is magic and require it.
Uses a 15 # weight falling 20 " on e rod with 1.5" dia. cone with 45 degree tip.
Sold by Durham Geo-Enterprises Inc., Stone Mountain GA
1-800-837-0864
They furnish a chart relating to N value??????? More magic??
RE: Dynamic Probing
With such small weight and fall, it sounds like it might be usable for probing at sites where you can't put a rig to use "dummy cone" (the polite name we used in reports when I worked in FL). However, it must be pretty limited in what strength/density it can test before it refuses. At what equivalent n does it refuse? I didn't find it on Durham's website, so might be discontinued?
Thanks,
DRG
RE: Dynamic Probing
They also have STP399 with the original charts. It refuses about N=12
RE: Dynamic Probing
RE: Dynamic Probing
I actually plotted all of the established correlations that I could find for what I will term the Sowers DCP (a 15 # weight falling 20 " on e rod with 1.5" dia. cone with 45 degree tip). They were so radically different that I determined that our company needed to develop our own correlations that we felt comfortable with.
RE: Dynamic Probing
We bought it from Durham Geo a few years ago. Any one else have experience with this DCP good or bad
RE: Dynamic Probing
There is a wealth of information the Army Corps DCP. The FHWA has done extensive research on it. My experience using it for estimating CBR for pavement design has been favorable.
RE: Dynamic Probing
I also need a correlation between the DP and SPT or Qu or Phi angle