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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...

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...

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...

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...

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...

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...

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...

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.

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...

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...

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.

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...

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...

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...

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...

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...

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...

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)...

Engineers, Anyone knows any approach on how to obtain the approximate C and phi values in rocks in order to perform slope stability analyses?

Engineers, I am getting involved in a project which consists of boulders, cobbles and large gravels. After reaching refusal in the top 6 inches below surface, the drilling firm proceeded with rotational drilling up 30 feet. The same type of materials were recovered throughout the depth of the...