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Thank you iandig

I am trying to find some information on service life and durability off geotextiles. Any help in this regard will be appreciated very highly.

What is Riffle's Geotechnical approach? I have heard of riffling in the context of sampling. I would appreciate any help in this regard. DocDirt

PSlem Thanks again. Let me admit that I had an ulterior motive in starting this forum. We are working on a drilled friction socket caisson project. Rock is blocky and jointed shale. Designs call for an allowable socket friction of 25 psi. I represent the field inspection group. We are using a...

thanks PEinc DocDirt

Pslem Would not the rate of cutting affect the torque in the case of helical piles too? DocDirt

Thank you dik for your posting. For determining the load taken in friction and in baring, I use Figure 9.18 b, Page 371, from the text on Rock Mechanics by Goodman. By the way, I did find some reference from Ohio DOT specifications regarding my question. It states that especially for caissons...

I was wondering if there is anyway to estimate the actual socket friction in a drilled shaft from the torque put out by the rig? DocDirt

Based on slake durability tests, we found that there is minimal slaking. However, we have stipulated to the contractor that the holes have to be concreted as soon after drilling. If the hole is left open for more than 12 hours, contractor has to pull ot the rebars, roughen the sides of the...

How about using a capillary (glass) standpipe with a plastic hose at the bottom with a pinchcock? DocDirt

Thanks again PSlem for your valuable insights and contributions. Thanks to PEinc for helpful hints DocDirt

Thanks JAE Special Thanks to PSLEM. Could you please tell me as to how to calculate the area, in this case of 1.05 sq ft from the diameter of 14in and pitch of 3 in? Will be much obliged. DocDirt

Helical pile advocates use torque to determine bearing capacity of helical piles. What is the theoretical basis for calculating torque of the machine to bearing capacity of geomaterials? DocDirt

Thank you BigHarvey DocDirt

How long should the hole be left open after drilling and before concreting? The job involves a friction caisson with a socket in Shale rock. Shale tends to slake and weather on soaking. I was told that the practice in some states dictates that an open excavation should not be allowed to stand...

Folks Sorry I have been dormant all this time. What I meant was that the design bearing pressure could have some connection with the subgrade modulus. The design bearing pressure for shallow foundations on sand, if the footing width is greater than 4 ft, is calculated based on allowable...

In some cases, for footings on sand (when the width of footing is greater than 4 ft), settlement influences bearing capacity. Since K is the ratio of settlement to applied pressure, there can be a correlation in that case between allowable bearing pressure (based on a settlement of usually 1...

There is a relationship between R wave velocities and S wave velocities based on Poisson's ratio. If you have deifficulty estimating poisson's ratios, you assume shear wave velocity to be approximately equal in magnitude to R Wave velocity with 10% error. I was able to develop some correlations...

Dear F-D I am on vacation and the testing is in still in progress. I have the following information which I am providing of the top of my head Tube from Boring A - Natural Water Content = 270% LL= about 200 Pl could not be determined as it was too fibrous peat. Dry Density = 27 pcf.( Material...

Dear Aeoliantexan Thanks, we already considered that due to a last minute suggestion by a friend of mine. We tested for gas during boring by using portable gas meter and also installed gas wells and tested for gas. While we noted concentrations of upto 5% in volume by air for methane in a couple...