SPT test
SPT test
(OP)
What about speed of hammer blow? is there any standard?
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
|
RE: SPT test
f-d
¡papá gordo ain’t no madre flaca!
RE: SPT test
RE: SPT test
Schmertmann did a study of this in about 1975 or 1976.
RE: SPT test
RE: SPT test
Are you sure you are only in sands or do you have rock or cobbles interspersed?
RE: SPT test
RE: SPT test
As for the clay, a SPT of 6 results in a medium stiff clay according to the various references that I use. A far cry from very soft.
Mike Lambert
RE: SPT test
Iron cementation? Maybe. . .
f-d
¡papá gordo ain’t no madre flaca!
RE: SPT test
RE: SPT test
f-d
¡papá gordo ain’t no madre flaca!
RE: SPT test
RE: SPT test
RE: SPT test
However, I am one of those old "dynosaurs". The SPT is a tool - as is your fancy black-box instruments that you appear to think are infallible. The engineer needs to take into account a variety of observations and tests into account, including experienced judgment, to develop a model and confirm that foundation support systems are adequate or not . . .
Obviously, you appear to work in an area that has a plethora of expensive equipment that can work on the sides of hills and travel without problems through forests, across streams and creeks and that. Congratulations. But there are locations in this world that one cannot drive a large vehicle either on tracks or wheels to a flat site in order to carry out such investigations. The SPT gives one a sample, too, to look at - to toucvh (and even smell) and to carry out laboratory testing - something that piezocones or seismic cones or dilatometers do not.
Most, if not nearly all, experienced geotechnical engineers are fully aware of the shortcomings of the SPT - and of the advantages and disadvantages of other "black-box" investigative tools that are now in, more or less, common use . . . but also realize that judgment is highly necessary with the use of any tool. Investigators should use a number of tools at their disposal including correlating a few SPT holes (and hence obtained samples) to the other types of probings. I, although a dinosaur, do in fact use to the extent possible and available other such devices - started using the piezocone back in 1982.
The nuclear density gauge came out in common useage in the late 60s - and I would presume that you are comfortable using this instrument. Do you believe without question the test results? Throw away that old time dinosaur known as the sand cone and rubber balloon! Truly, the nuclear guage is right - it's computerized, eh?
Do not throw the old timers under the bus . . . we do have value . . . Perhaps, one day, it might come back to haunt you.
RE: SPT test
RE: SPT test
To clearify you, I am from south asian country nepal. beside SPT neither CPT nor Vane share or other test available over the Nepal.