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  1. geot88

    Residual strength: internal friction angle

    Dear all, I have this doubt at the office. We considered an internal friction angle for a liquefied sand, let’s say 28 degrees. The residual internal friction angle (after liquefaction) must be a lower value, let’s say 10 degrees. Structural engineers asked: why is that possible since...
  2. geot88

    NET or GROSS bearing capacity on mat foundations

    Why do we use NET instead of GROSS bearing capacity on mat foundations? Thanks in advance
  3. geot88

    Floating foundation for a WWTP

    I need to design a floating foundation for a WWTP. The bottom level of the mat if already set by the hydraulic design. The excavation needed is 6 meters (20 ft) deep. I need to check the limit states (failure and serviceability) of the foundation. However, while calculating the increase in...
  4. geot88

    Slope Stability of open channels

    We are working on a project consisting of a trapezoidal open channel. Currently, the cross section is trapezoidal but it is not uniform along this channel. The height of the slope is between 2 - 3 meters (7 - 10 ft). The project consists in excavating 1.5 to 2 meters (5 - 7 ft) deep, to increase...
  5. geot88

    Maximum horizontal acceleration and Liquefaction analysis

    I am working on a Liquefaction analysis and I don't know how to get a max / g. In my country, we have a local code, which is similar to ASCE 7-05: Site Class is E. Zone factor is 0.40 Fa is 1.0 I appreciate your help.
  6. geot88

    Limit Equilibrium or Strength Deformation Analysis on Residual Strength

    I will be analyzing the slope of an embankment over soft clays. It has been probably 2 years since the embankment was built and it shows many cracks -probably because it has slid a little bit- and I believe the clay under the embankment may have reached its residual strength. Can I perform a...
  7. geot88

    Group by Ensoft, should I consider pile cap weight?

    I am running a model on Ensoft Group. When adding the vertical loads, should I consider only the load of the superstructure? r should I add both superstructure and pile cap (or mat) above the piles, considering both kind of loads will be applied to the piles? I was searching on the manual but I...
  8. geot88

    Compensated foundation: total or effective unit weight?

    Hi all, I am analyzing a compensated foundation and I have this question: When calculating the stress of the soil to be excavated, should I use the total unit weight or effective unit weight? The data I have is: SOIL PROFILE: from 0 to 2 m depth, a granular fill from 2 to 10 m depth, soft...
  9. geot88

    LPile Loads

    Hi all, I'd like to be clear when analyzing driven piles under seismic loads. First, I calculated the axial capacity of an individual driven pile with APILE. Let's say I need 8 piles for that structure. Then, I need to analyze an indiviudal pile with LPILE. At the loading menu, should I divide...
  10. geot88

    Should I perform a slope stability analysis?

    Hello guys, I need some help on this project. I have attached the an image to understand it better. I have this concrete structure that will support a 2-lane highway, 1-way per direction. The client asked to do the geotechnical investigation and calculate the bearing capacity of the strip...
  11. geot88

    Consolidation Tests - Laboratory

    I have an unsaturated MH sample, obtained from above the groundwater level, and I need to have consolidation parameters for design. We normally run consolidation tests of samples under the groundwater level (theoretically fully saturated), so the primary consolidation process takes effect when...
  12. geot88

    Foundation for Seismic Simulator - vibrating table

    We have to do the geotechnical analysis for a seismic simulator (vibrating table) - similar to the one in the picture. It will be founded on shale and sandstone. There is also rock underneath. I am going for a mat foundation. Is there any recommendation anybody can give me? What method would...
  13. geot88

    Foundation of Monopole: Shallow or Deep?

    The company I'm currently working for has been called to do the Geotechnical design of many monopoles in the city. They gave us a sample study (they have worked like that in other countries) and wanted us to do something similiar here. The requirements were: -Do SPT continously up to 6 meters...
  14. geot88

    Bearing Capacity of Reinforced Soil over Clays

    Hi all, I need to calculate the bearing capacity of a spread footing. B= 2 ft. L= 19 ft. Df= 1 ft. The underlying soil is mainly stiff clay. The bearing capacity, using Terzaghi's theory, is kinda low. I can recommend using a geosynthetic as reinforcement, after replacing 0.7 ft. with...
  15. geot88

    Best Software for Bearing Capacity of Shallow Foundations

    Hi, I'd like to buy a software for calculating bearing capacity of shallow foundations to provide a better report presentation for my firm. The software MUST consider multilayer analysis. If it can make analysis using Geosynthetics, it would be perfect. I've heard about the one provided by...
  16. geot88

    What kind of triaxial test should I use?

    Hi, this is my first thread here :) I need to analyze the soil stability of this slope. There's a 30 KM road just next to the slope (at the bottom), and I need to stabilize it. When it rains it fails and some of the soil falls to the road. Additionally, the rain destroys the pavement. Please...

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