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  1. Eugene Lim

    Scour and Geotechnical Parameters - What are the essential info bridge engineers require?

    BridgeSmith Thanks for your input! Yes, you are right. The hydraulics engineer is the key person, who takes the geotech input and converts it to a design scour depth which bridge engineers like yourself will use. I have discovered that the geotech parameters needed are PSD and Atterberg limits test.
  2. Eugene Lim

    Scour and Geotechnical Parameters - What are the essential info bridge engineers require?

    Hi guys. My question relates specifically to scour in bridges over water bodies. I'm wondering what are the essential information that bridge engineers require from geotechnical engineers apart from particle size distribution and atterberg limits testing. Input much appreciated!
  3. Eugene Lim

    Is this slope possible?

    geotechguy1 The fill material has not been decided, but is currently well-graded sand. Beneath the embankment is stiff clay, followed by dense sand and sandstone. The existing ground at the toe of the slope continues to slope down. It would require 4-5 m extra to extend the slope to flat ground...
  4. Eugene Lim

    Is this slope possible?

    EireChch Thanks for your response. No peat or rock. Engineered fill. Are you talking about the infinite slope calculation?
  5. Eugene Lim

    Settle3

    geotechguy1: No worries. I found it under project settings. It only works for flexible footings tho.
  6. Eugene Lim

    Is this slope possible?

    Q1: What is the construction sequence for the batters? Q2: Hydroseeding with jute matting where the slope overlay is thin. But this technology will not work near the toe of the slope due to thickness. Is the slope stable under its own weight?
  7. Eugene Lim

    Settle3

    I'm using Rocscience's Settle3 to analyse consolidation settlement. Amazing! I can compute immediate and primary settlement so quickly. However, I cannot find the secondary compression part including time step. Anyone know how to work this?
  8. Eugene Lim

    Typical Gantry Loads

    Hi. I am a geotechnical engineer. I received the following sketches from the structural engineer for 2 options of highway gantries. I am estimating pile lengths, without estimated loads from the structural engineer. Can anyone give me a rough idea of how heavy these gantries would be? Rough...
  9. Eugene Lim

    Back-calculating ground compressibility from field measurements of settlement.

    My project involves adding new loading to existing pad footings sitting on 5m fill underlain by soft soils. I am trying to back-calculate ground compressibility parameters (compression ratio, coefficient of consolidation, permeability and pre-consolidation pressure) from 20+ years of field...
  10. Eugene Lim

    Small-strain vs. large-strain shear modulus - General Bearing Capacity Equation

    Thanks for your responses! EireChch: General BC Eqn. only works for the failure mode of "general shear failure." To check against other failure modes i.e. "punching shear" and "local shear failure," most codes require a check of the foundation's rigidity. I have seen 2 methods to undertake this...
  11. Eugene Lim

    Small-strain vs. large-strain shear modulus - General Bearing Capacity Equation

    The general bearing capacity equation requires a check of the foundation's rigidity index (Ir) against critical rigidity (Irc). Shear modulus (G) value is required to determine Ir. Is it the small-strain or large-strain shear modulus that should be used?
  12. Eugene Lim

    Books on running a professional engineering consultancy.

    Thank you all for your responses. @JedClampett - I get your point. I agree to a certain extent. However, in other fields, there are top people who write books. I think there maybe other reasons e.g. market, sales, etc. @glass99 - Thank for introducing PSMJ! @271828 - Looks good. I will get a...
  13. Eugene Lim

    Books on running a professional engineering consultancy.

    There seems to be limited literature on running an engineering consultancy that touches on topics such as tendering strategy, professional fees and construction supervision. I only know the following: (1) How to Select and Work Effectively with Consulting Engineers - Getting the Best Project...
  14. Eugene Lim

    Gmm vs St - Maximum Theoretical SPECIFIC GRAVITY or RELATIVE DENSITY

    With respect to quality control testing of Hot Mix Asphalt (HMA), what is the difference between the Maximum Theoretical Specific Gravity (Gmm) as defined in AASHTO T209, and Maximum Theoretical Relative Density (ST) as defined in BS 598 Part 104 (Appendix E). I understand that they are...

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