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  • Users: longisland
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  1. longisland

    Finite element meshing

    Hi all, I would like to know the difference between a triangular mesh & an irregular shape mesh in FEA analysis. What are the limitations & advantages between the two approaches? Thanks
  2. longisland

    Downdrag on soft clay

    Hi, I'm constructing a piled retaining wall over a soft ground. The borelog shows the first 30ft is very soft clay with plasticity index of 40 & average SPT of 2. The water table is 1 ft below the existing ground. I will raise the platform level by 4ft with compacted fill. I've referred to...
  3. longisland

    Signalized Intersection Level of Service

    Hi, I'm part of a road maintenance crew assigned to carry out a field traffic count for an existing signalized intersection. The last time I was involved in Traffic Engineering was in College. Anyway, the signal phase for each leg is about 20 to 35 seconds. The whole cycle is about 140...
  4. longisland

    Soil nail design question

    Hi all, I'm supervising a soil nail wall construction. I need to carry out some design calculation for rearranging the soil nail layout to accomodate the site. I'm using the FHWA manual as reference. How to assign the Sv & Sh if I were to use staggered layout. Assume the initial layout was...
  5. longisland

    looking for shear strengh parameters of highly weathered rocks

    Hi all, I've browsed few rock mechanics books such a Hoek et al on shear strength of rock; it would be a great help to me if I can get some ball park figures to start off with before I do a full scale testing. The rock is highly weathered or fragmented. The RQD values of the rock core samples...
  6. longisland

    Testing of stiff clay samples on slopes

    Hi all, I am carryng out routine soil investigation on slopes during slope cutting; the objective is to counter check the design parameter during design stage. Boreholes and test pits are conducted. We were unable to collect undisturbed samples in the borehole. The samples are fractured stiff...
  7. longisland

    Shear Test For Highly fractured stiff clay on cut slope

    Hi all, I am carryng out routine soil investigation on slopes during slope cutting; the objective is to counter check the design parameter during design stage. Boreholes and test pits are conducted. We were unable to collect undisturbed samples in the borehole. The samples are fractured stiff...
  8. longisland

    Grout Specification

    Hi all, I'm looking for grout specification for soil nail. My main concern is shrinkage. I checked a few FHWA specs but there is no specification on the grout. Thanx in advance.
  9. longisland

    Geoslope VS Geostudio

    Hi, I'm a Geoslope Version 4 user & I tried my friend's Geostudio 2004. There are quite a few changes in the 2004 version notably the output files are reduced to one file. I imported a version 4 project to the 2004; the results were okay in Bishop Method but the FOS were way off when I used...
  10. longisland

    Cold joints

    Hi, A post tensioned girder was poured with cold joints formed & there is no proper construction joints. The incident happened when one truck of the concrete was rejected since the slump was only 2 inch. The next pour was 2 hours later but they claimed it's okay since set retarders was added...
  11. longisland

    Superelevation

    Hi all, I'm looking for work examples for superelevation especially on reverse & compound curves for both circular & spiral curves. The curves i'm dealing are pretty 'tight'; the straight section between two curves is very short or non-existing. The radius are ranging from 200 to 600 feet...
  12. longisland

    chlotoid curve equation

    Hi all, I'm looking for chlotoid & spiral curve curve equation in metric for my hp 48 & my ipac; the green book doesn't tell much. thanx corey
  13. longisland

    Foreign steel sections

    Hi all, I'm designing a portal frame & my client told me to use some steel sections from Australia. What conversions do I need to do to perform in order for me to use the foreign sections? Our Ultimate limit state factors is 1.4D + 1.7L & I was told Australia Code is similar to Canadian Code...
  14. longisland

    Ramp

    Hi, I posted this thread in AASHTO forum & hope to get some feedback here. I'm planning to build a short span ramp to allow a 40 foot trailer to climb 10 feet. Initially, I suggested 2:1 H:V or 50% climb & the reaponse was no. What if I lower the gradient to 3:1 or 4:1 ? The climb would be 33%...
  15. longisland

    Ramp

    Hi, I post a similar question before; I hope to get better response after I refine my post. My friend is planning to build a ramp swith 2:1 (H:V) slope. The ramp is 20 ft run & 10 ft rise. I'm looking for charts or publications to check if a fully loaded 40 ft container truck can actually climb...
  16. longisland

    SPT N correlatuion to phi in rock

    Hi all, I'm looking for SPT N correlation to phi for rocks. The samples I collected ranges from very dense sand, shale & rocks with SPT N 50. Is there any reference online I can refer to ? Bowles has a pretty good correlation table for sand up to SPT 45. Thanks in advance
  17. longisland

    embankment fill on slope

    hi all, Can someone shed some light on embankment filling on sloped ground? What's the steepest allowable natural slope a 2:1(h:v) embankment can be constructed on top assuming no slope stability & bearing problem to the natural slope. In another words, the gradient which machinery can perform...
  18. longisland

    Hollow core

    Hi, Is there any way to design a hollow core without using finite element?
  19. longisland

    Basement dewatering

    Hi, I'm designing a carpark basement of a office tower. the basement is 3 ft below mean sea level & the water level recorded in the piezometer is roughly the same level. I'd appreciate if someone can shed some light on how to to ensure the basement is not subject to flood. th thanks
  20. longisland

    Soil testing for slope stability analysis

    Hi, I've assigned borehole on site to collect soil samples & data for slope design. Unfortunately, I'm getting disturbed samples since the formation is very stiff sand to sandstone of SPT 50. What other tests should I assign? In fact, is there a rule of thumb in soil test assignment for slope...

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