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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. pelelo

    Swell tests on very stiff clays (SPT-N > 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...
  10. pelelo

    Static stiffness for wind turbines

    Engineers, I am working on a wind turbine project which requires to compute both the Kdynamic and Kstatic. There are several approaches for Kdynamic but I haven't found any for the static stiffness. Does anyone know a reference?. Thanks.
  11. pelelo

    Soil sieve set for performing grain size distribution

    Engineers, Do you know if there any specific sieve set to be used to perform grain size distribution analyses for typical soils?. For example ASTM C33, for fine aggregates, specifies very clearly to use sieves 3/8", #4, #8, #16, #30, #50 and #100 in order to evaluate the grain size...
  12. pelelo

    Liquid Limit Vs Plastic Limit

    Engineers, As all you may know PI = LL - PL. Is is common the fact that someone reported a plastic limit (PL) being greater than Liquid limit (LL)?. I know that automatically, since PL > LL, PI is negative and any software could call it as Non Plastic, but I am not sure if this is ok in this...
  13. pelelo

    ASTM for specific gravity in clays and silts

    Engineers, What is the ASTM followed to perform specific gravity tests for Clays and silts? I am aware that C127 is for gravels and C128 is for sands. Someone told me he runs C128 for silts and clays as well but this doesn't make sense. Please advise.
  14. pelelo

    concrete wall sliding and OT checks

    Hello, I ran a global stability analysis for a concrete retaining wall using SLOPE/W. As usual, other than global stability, we need to check Overturing and sliding. I was wondering If it is advisable to obtain the acting forces on the WALL from SLOPE-W analyses OR do i need to run another...
  15. pelelo

    factored loads vs non factored loads

    Engineers, I am involved in a project in which the scope is to confirm if an specific section of a drilled shaft with a depth D is safe to be used for a project. Client provided the the unfactored loads for both tension and compression. Naturally, these loads are coming from the structural...
  16. pelelo

    Bearing capacity near vertical cut

    Engineers, I know that NAVFAC (DM 7.2) provides guidance of how to estimate the bearing capacity of footings on slopes or near slopes. I noticed the steepest slope they consider is B = 40 degrees. I was wondering if there is any other reference which estimates the bearing capacity of soils...
  17. pelelo

    RQD in conglomerates

    Hello engineers, We are getting involved in a project which includes drilling few 15 m deep borings on an area surrounded by conglomerates, most likely in the top 20 mts. The specifications state to record the recovery and RQD whenever rotational drilling is performed (e.g coring). I...
  18. pelelo

    Shelby tubes smaller than 3 in diameter

    Engineers, As you may know, the most common shelby tube diameter is 3 inches. There are 2 inches diameter shelby tubes available as well. I was wondering what are they useful for?. It is my understanding that for consolation and triaxial testing, it is required 3 in diameter, however I am not...
  19. pelelo

    static settlement vs Post-liquefaction settlement

    Hello, Our local code limits footing settlement to 1 inch and mat settlement to 2 inches. The same way there are static settlement limits for footings and mats, are there any for post-liquefaction settlement?, or when are post-liquefaction settlements considered to be ok or too high? To my...
  20. pelelo

    Different bearing capacities point of view

    Hello Engineers, Few years ago I was involved in a project which consisted in the construction of a 12-story building + 3 levels of basement (27 ft deep excavation). The geology of the area is weathered coralline limestone (see picture attached). Consultant A (the original geotech consultant)...

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