Soil Friction Angle
Soil Friction Angle
(OP)
Is there any computer program or table to determine what the design parameters such as the friction angle is by inputting the information from a boring log.
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RE: Soil Friction Angle
There are many published tables of typical values, but those can lead you astray if you are not asking the question that they answer.
RE: Soil Friction Angle
Just to add to the discussion: To do geotechnical engineering requires subsurface exploration, sampling and laboratory testing. It also requires some understanding of the proposed construction and the loads/stresses conveyed to the subsurface. With that said, to develop correlation to laboratory testing parameters JUST from the boring log data could be negligent. It's like describing a person by looking at their back - just not the whole picture. The boring log shows the details of the subsurface as you collect samples. If knowing the friction angle is the relavent parameter, then run the lab test. Correlation would then just not be needed. If friction angle is not important, I guess you could guess - but what's the purpose? Then again, maybe you want consolidation characteristics, undrained shear strength or some other parameter. . . .
The boring log is just one dimension to the needed data. Trying to gleen the entire image from that has been attempted, but results may be misleading.
¡papá gordo ain’t no madre flaca!
RE: Soil Friction Angle
RE: Soil Friction Angle
However it does show that with only a little knowledge, you can generate numbers to design problems with the "right" software.
RE: Soil Friction Angle
RE: Soil Friction Angle
The nexus of geotechnical engineering is knowing when to:
1) know that the field data is suspect; and
2) know when the laboratory data is suspect.
It does seems that more often than not, the geotechnical's cummulative experience with formations that he's familiar with, which in my case grows with each experience, is considered by some to be less than valuable.
One wonderful geo-professor told me that after he received and reviewed his laboratory results, if the results did not fit with his expections of the parameters in question, he'd send it back to the lab be run again.
The old IBM adage of "GIGO" goes along with "caveat emptor."
RE: Soil Friction Angle
RE: Soil Friction Angle
RE: Soil Friction Angle
However, it does not have to be a bad thing, and being a proponent of the use of computer programs, I encourage the smart use of computer to develop this "feel" of what to expect, conduct the "sensitivity" analysis etc... because the time saving and the knowledge learned in invaluable.
RE: Soil Friction Angle
RE: Soil Friction Angle
all the best.
RE: Soil Friction Angle
RE: Soil Friction Angle
mudman54 has pointed out something that I have seen forgotten or misunderstood many times.
It's especially true if there are fines in the material, and be especially careful if the material being tested in DS is partially saturated (e.g., at Proctor OMC), because the capillary tension creates pseudocohesion that is lost if the material becomes saturated.
DRG