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  1. kwalton

    Slope stability software

    I suspect that cdstan has bought the software by now. However, I have used SLIDE and SLOPE/W and both seem to have similar features but sometimes dealt with in different ways, e.g. anisotropic strength functions, and one method may be preferable to the other depending on your requirments...
  2. kwalton

    GEOSTRU USERS?

    I have found the same problem but have found the company quite helpfull. If language is a problem, they do have a guy with a good command of english.
  3. kwalton

    Gravity flow from circular pipe out of tank

    Thanks for that. I have an open topped tank with pipe inlet at half bore and the outlet pipe is acting as an overflow so is flowing out under gravity at about half bore. I have got Manning's formula but can you help me with the following: Roughness - In a reference I have this can vary from...
  4. kwalton

    Gravity flow from circular pipe out of tank

    I am trying to determine the gravity flow out of an oil imterceptor tank. Water is flowing out of the tank through a 50mm diameter pipe and the pipe is about half full. Is there acalculation I can do along the lines of that for a v-notch wier to calculate the approximete rate of flow.
  5. kwalton

    looking for shear strengh parameters of highly weathered rocks

    I have also used Hoek-Bray method using Roclab (also downloadable from the "Rocscience" site)to good effect, giving what I judged to be realistic mohr-coulomb parameters in weak fragmented rock.
  6. kwalton

    how to get factor of safety of slope based on finite element analysis

    To gamadot: The problem is just the same whether you are undertaking Finite Element or Limit Equilibrium analysis. You have to decide on realistic strength & density parameters to start with and go with those unless you are undertaking probability analysis. You need to consider the nature of...
  7. kwalton

    how to get factor of safety of slope based on finite element analysis

    That will depend on the software. I have been using Phase2 (Rocscience) and my version does not do SRF automatically. I have to work out c & phi for each run then change the Mohr Coulomb parameters each time. I understand that the next version of the software will incorporate automatic...
  8. kwalton

    Slope stability with vegetation

    There's a paper on this subject in the UK Institute of Civil Engineers "Geotechnical Engineering", October this year - Just out
  9. kwalton

    how to get factor of safety of slope based on finite element analysis

    I would like to pick up a point that Smokeybear hinted upon, particularly with regard to non-circular failure. In LE methods we have to define a critical surface and then analyse that. In other words we have to decide on the critical surface before we run the analysis. Yes, we can (and...
  10. kwalton

    how to get factor of safety of slope based on finite element analysis

    I have been giving some more thought to Focht3's comments re the location of the critical surface and conclude that these comments apply equally to limit equilibrium analysis. In plastc FE analysis, you are generating the potential failure surface, not the critical failure surface. With limit...
  11. kwalton

    Slope stability with vegetation

    Professor Doug Stead at Simon Fraser University BC has published some papers on this subject wrt forestry works. They are listed on his web page at the university.
  12. kwalton

    how to get factor of safety of slope based on finite element analysis

    Before I get pulled up, yes, I have just realised that I refered to the "failure surface" when Focht3 refered to the "critical surface".
  13. kwalton

    how to get factor of safety of slope based on finite element analysis

    Bit of a put down from Focht3 & BigH! wenandsky88 was asking for the technique and I have explained it, (perhaps not as well as I might have). With regard to changing the location of the failure surface, assuming that the slope is stable, there will be no failure surface anyway at the input...
  14. kwalton

    how to get factor of safety of slope based on finite element analysis

    I am not familiar with the FE programme you are using. However, I use Phase2 from Rocscience so can tell you how it is done in that software. I presume you are using Mohr Coulomb strength parameters c & phi. (Phase also allows the use of Hoek-Brown parameters) The material type needs to be...
  15. kwalton

    Rock Mass Rating to Shear Strength Parameters

    I use Roclab too and it's a great bit of free software. River Lode goes back a long way, before Prof Jennings & Oskar Steffen were involved and there probably wasn't much design information anyway. I was Senior Soils Engineer at Nchanga 1975-1979, about the time River Lode was being filled in...
  16. kwalton

    Rock Mass Rating to Shear Strength Parameters

    have you considered using Hoek-Brown? I know it's a bit of a round about way of arriving at Mohr-Coulomb parameters but I've used it in some instances and come pretty close to my perception of the shear strength of the strata concerned. Your description of the strata could be Nchanga but I...
  17. kwalton

    FEM Mpdelling of Slope

    Look on the Rocscience web site, you'll find some downloadable papers on strength reduction ror analysis of slopes. Commercially available software will generate the mesh (matrix?) but it can be a tedious process for complicated / thin strata to get good quality mesh.

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