Search results for query: *

Hi All- In the absence of lab testing, what do you think is the preferred correlation to Su of CL material: SPT or Pocket Pen/Torvane on a sample from an SPT or CalMod sampler? Also (dgillette if you are out there); looking for USBR criteria for seismic loading for simplified seismic...

Does anyone have experience and/or references on how this may be performed? Drive Piles, 30 feet of MSW. Stiff clay below. High seismic area. Thanks

Hi guys, Trying to correlate DCP data to SPT. I have searched the threads and found some information, but nothing that quite answers my questions. The DCP is from Humboldt. It has a 17.6 pound hammer, a 20 mm (0.8 inch) diameter, 60° cone, and a drop height of 575 mm (23 inches)...

Hi, I'm not a structural engineer, but I'm doing a rough check on buckling of a pile that is supporting axial load only for a wharf. There is an unsuppoted length between the top of wharf and mudline. I'm using Euler's formula and need to know equivalent moment of inertia of a concrete filled...

Hi all, I am looking for mitigation measures to prevent chemical (water soluble sodium sulfate) heave of floor slab in Las Vegas. Local practice seems to be to provide a thickness of aggregate base below a floor slab if the subgrade soils have a high level of water soluble sodium sulfate. The...

In addition to high lateral earth pressure for a secant pile wall due to low friction angle of fat clay, lateral pressures due to potential swell may be applicable. The clay has a very high Expansion Index (130+), PI=44, LL=73. Any thoughts on how to estimate additional lateral pressure due to...

I often see geotechnical reports that recommend upper limits on passive pressure, and I cannot find a good reason for this limit in the literature. It is often in relation to soldier pile walls where an equivalent passive fluid pressure is provided, for example; "allowable passive pressure of...

Hello, Trying to make a rough settlement estimate without much project info in Southern California. Any ideas on typical column loads for a 4-Story Parking Garage (Dead and Dead + Live)? How about the ground floor (6" concrete slab + Live load from passenger cars)? Thanks!

Hello, Trying to make a rough settlement estimate without much project info in Southern California. Any ideas on typical column loads for a 4-Story Parking Garage (Dead and Dead + Live)? How about the ground floor (6" concrete slab + Live load from passenger cars)? Thanks!

Hi Guys, I have somehow managed to stay away from LRFD work up until this point in my career, but I now need to deal with it so I’m trying to wrap my head around it. I have a drilled shaft project for a pedestrian bridge in the Los Angeles area (Caltrans). A complicating issue is there is...

Hi All, I'm reviewing soil nail wall plans. They show 1 - 1' wide geocomposite drain between soil nails spaced about 5.5' horizontally. Wall is up to 25' high. I'm not anticipating a lot of seepage (Southern California), but 1' just seems a little skimpy. Is this fairly typical? Any thoughts...

Hi Guys, I know this is not a reliable correlation, but...does anyone know of something published that correlates N60 to Su? These are very stiff clays with blow counts > 30. References would be great. Thanks!

Curious to know if many people are using the 2008 Sitar/Al Atik methods for seismic earth pressure estimations rather than the classic Mononobe-Okabe, or if any agencies are allowing/recommending the newer method?

Hi Guys, The subject title says it all! There is a project requirement for this information, and I have never worked with the Pressuremeter before. Are the correlations (if they exist) very reliable? Thanks

Does anyone know a design method/guidelines for design of drilled shafts adjacent to an MSE Wall? Looking at a project where houses will be constructed adjacent to a 20' high MSE wall, maybe within about 10'-15' of wall. Looking at supporting houses on drilled shafts. Need to evaluate...

Hi Everyone: This is not a homework problem! Sorry but this is a little long-winded: I have Modified Compaction test results (6" mold) and gradation for a SM/SC material that has about 10% retained on 3/4" sieve and 30% retained on the 3/8". I also have field density tests (some rock corrected...

Does anyone know if there is anything published (AASHTO/FHWA, etc.) that provides an estimate of number of ESAL's for loaded and empty 20CY haul truck. I don't know have info. on axle config. Thanks!

I have searched but unable to find guidelines/discussions for evaluating liquefaction triggering (on flat or gently sloping ground) for a submarine condition (lake bottom or ocean). In particular, the Cyclic Stress Ratio (CSR); will the total stress include the water pressure above the soil...

Hi all, I'm looking to buy a good book for design/selection/performance for Temporary/Permanent excavation support and shoring. I have general familiarity with the topic but appears I may be doing some detailed design work soon. Nothing specific yet but I am looking for a good reference that...

I am interested to hear how geotechnical engineers in this forum are using results from isotropic compression triaxial testing; both CU and UU with respect to anisotropy. I have recently reviewed reports where engineers attempt to correct isotropic tests to model what they believe are...