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  1. pelelo

    Lateral stiffness being requested by Structural engineers

    Ok, makes sense. If I already provided all the pile capacities and rebars, what are the additional analysis the structural engineer needs to perform if I provide the P-y curves? To my knowledge I already provided all the necessary information from the engineering point of view. Nothing...
  2. pelelo

    Lateral stiffness being requested by Structural engineers

    Engineers, I am a geotechnical engineer and usually in projects that involved piles, we recommend axial and lateral pile capacity. After sending the geotechnical report to the client, the structural engineer requested the pile lateral stiffness. This is the first time we are asked this...
  3. pelelo

    Auger cast pile with no rebars

    Thanks a lot. Yes, I meant Compressive axial load only.
  4. pelelo

    Auger cast pile with no rebars

    Engineers, Someone approached and asked me if is possible to drill a hole (for example 50 ft deep), pour concrete or grout (tremie) but not include any rebars. I assume this is possible where lateral load is not a concern (only axial capacity is needed). I guess there is a name for that...
  5. pelelo

    Meyerhof's correction factors for Bearing Capacity Calcs

    Engineers, As you may know, in the general bearing capacity equation there are correction factors that account for depth, shape and inclination. Using Meyerhof bearing capacity DEPTH factors (see attached), I noticed the wider the footing the lower Fcd is, therefore will result in a lower the...
  6. pelelo

    Design allowable bearing capacity based on Overburden pressures

    I am not sure how relevant this is. All is the same. Clayey Sands (SC).
  7. pelelo

    Design allowable bearing capacity based on Overburden pressures

    Thanks for your response Tigerguy. No, I got the 8,000 psf from "local" bearing capacity analysis, such as, at bearing capacity analysis at the bottom of the excavation. Therefore the 8000 psf does not consider the Overburden pressure. In this case, settlement is the critical part. What I...
  8. pelelo

    Design allowable bearing capacity based on Overburden pressures

    Engineers, I am working on a project that will consist of a 20 story building + 45 ft of excavation for 5 levels of underground garage. Due the loads, and after performing all the geotechnical calculations, the best solution to support the building is on a mat foundation. After running all the...
  9. pelelo

    Static shear modulus based on geophysical results

    Thanks ssiguy, Just to clarify, when you say "Expect to multiply G0 by a factor of 0.25 to 0.65 for most cases", you meant to obtain Gstat from a G0?. IF not, do you know if there is a reference that correlates Gdyn and Gstat? (if there is any)
  10. pelelo

    RQD and REC in core run with different types of rock

    So if RQD is 20% for example, you would classify the core length as very poor?, instead of an specific rock type as being very poor?, correct?
  11. pelelo

    RQD and REC in core run with different types of rock

    Hello, When performing rock coring (rotary drilling), I was wondering how would you measure the recovery and RQD for an specific run IF there are different types of rock?. For example, the total run is 5 feet (60 inches). The first (top) 1 ft is sandstone, then 1.5 ft limestone, then 1 ft of...
  12. pelelo

    settlement computation on a footing subjected to moments and axial load

    Engineers, I posted this question in the geotechnical forum but did not get a response. I was wondering if a structural engineer can provide any feedbacks about this. At the end, the structural engineering and geotechnical engineering overlap at some point. I have a footing subjected to...
  13. pelelo

    Settlement calculations on eccentrically loaded footings

    Engineers, Is there any special method to compute settlement on on eccentrically loaded foundations?. There are many references about considerations for computing bearing capacity but nothing related to settlement. I have a square footing subjected to lateral force and moments in both X and Y...
  14. pelelo

    Swell tests on very stiff clays (SPT-N > 15 BPF)

    MTNClimber, Thanks for your response. California sampler is considered an disturbed sampler (due to the driving). If you want to run swell tests or any other advanced test, you want to extract undisturbed samples. Have you tried the pitcher and denison samplers?. I have not, that't why i ask.
  15. pelelo

    Swell tests on very stiff clays (SPT-N > 15 BPF)

    I have heard of this. This is a reasonable approach if the sample is shallow (< 10 feet). What happens if the sample is 50 ft below ground?.
  16. pelelo

    Swell tests on very stiff clays (SPT-N &gt; 15 BPF)

    Other than the california sampler, any one recommends any other sampler? Cali sampler is a disturbed sampler as MTNclimber mentinoned. Even though there are several types out there (denison, pitcher, etc), i was wondering which one you recommend based on your experience. Thanks,
  17. pelelo

    Static stiffness for wind turbines

    Ok, Thanks a lot!.
  18. pelelo

    Static shear modulus based on geophysical results

    Engineers, I have Vs30 from the geophysical report. As you may know G = gamma x (Vs)2. It is my understanding that in this case G would be the dynamic shear modulus Gdyn. I was wondering if there is an approach on how to determine the static shear modulus Gstat, based on the Gdyn or Vs30...
  19. pelelo

    Swell tests on very stiff clays (SPT-N &gt; 15 BPF)

    Tigerguy, I am impressed your drill crew being able to extract shelby tubes with N around 30. I have never seen that before. In my experience, SPT-N of 10 or less is ok to extract shelbys. I have heard of other firms to extract shelbys if N values are less than 15.
  20. pelelo

    Swell tests on very stiff clays (SPT-N &gt; 15 BPF)

    Engineers, The original geotechnical report of a site mentioned that there are shallow clays with swell and collapse potential (conclusions obtained based on the lab tests). There is a second round of a geotechnical investigation for this site in which it is required to perform swell tests...

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