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  1. Jalthi

    Pile group efficiency for circular pattern

    The answer to your first question is YES. However, note that 3 times diameter is a rule of thumb and applicable for axial loading only. For lateral loading there are different critria. I am not familiar with the term "Geometric Effectivity". But it seems like this is a comparison of piles...
  2. Jalthi

    Pile group efficiency for circular pattern

    The attachement shows the minimum center-to-center spacing between any two piles is 8.5 times the diameter. In this case there is no (or extrememly minimal) group effect.
  3. Jalthi

    Excel Question - Spread Footing Design Chart

    Change the range of the 'source data' such that it will show only the portion you would like to present.
  4. Jalthi

    Tangent / Secant/ Drilled Shaft wall Modelling in Lpile

    SixDegrees: Your point is noted. That is why I model the embedded portion of the shaft in Lpile. The cantilever wall portion is assumed to be standing above the ground where I apply distributed pressure along its length that represent active earth pressure with pore water. Do you think it is a...
  5. Jalthi

    Tangent / Secant/ Drilled Shaft wall Modelling in Lpile

    I was wondering how one would model a drilled shaft wall in Lpile to determine the lateral deflection and depth of embedment. I would model the height of the wall as part of shaft that is unsupported by earth. Then apply lateral earth pressure on the unsupported part. In other words: 1...
  6. Jalthi

    Seismic Site Class Determination

    I understand that the upper 10 feet of the soils are 'very weak'. It does not necessarily mean that the upper 100 feet is weak. In my opinion you can do a shear wave test to determine the site class. Generally these tests consider the soils in the upper 100 feet.
  7. Jalthi

    Direct Shear Help

    Theoretically, yes you should run consolidation test. However, I haven’t seen anyone doing it. The rates I have seen vary between 0.0005 inch/min (for clay) and 0.02 inch/min (for sand). The rate of shear should be determined such that there is ample time for drainage. Remember the test is...
  8. Jalthi

    Base Course for Highway Pavement

    It is worth to note that the roadway design is not necessarily applicable to parking lot design. Parking lots are generally “designed” based on prior experience. Pavement sections for roadways are, on the other hand, designed based on ESALs. However, if you choose to go with AASHTO, the design...
  9. Jalthi

    Retaining Wall Design?

    The wall is estimated to move 0.002 times the wall height to mobilize the active earth pressure (DM 7.2). If the wall (top) movement does not reach 0.002H, you may expect additional movement as well as lateral forces in the future.
  10. Jalthi

    gINT Log design

    I agree the gINT help manual is not helpful at all. I haven't understood what you would like to do. Can you rephrase or attach a diagram?
  11. Jalthi

    Seismic Data (Site Class / Soil Class)

    Usually the geotech consultant determine the site class. They generally recommend site class D(Kind of default). If the soils are 'weaker' then the class will be E or F. Higher classes such as A and B should be determined through seismic testing. Since you are using a bearing capacity of 2000...
  12. Jalthi

    where to download CWALSHT

    Prepaid envelope required?
  13. Jalthi

    design Anchor force on SLOPE W

    There must be a way in Slope/W. I use Slide and it has an option 'show support forces' to get this data. On another note, if you use grout anchors in the upper strata, there is a potential that the adjacent building could move up by inches.
  14. Jalthi

    Strike and Dip

    Strike and dip are the very basic angles that defines the orientation of a rock mass. It is used mainly to determine the failure plane.
  15. Jalthi

    Slope Stability Analysis under an Earthquake

    Should be in the user's manual.
  16. Jalthi

    MSE Wall - LRFD Version

    In the external design of MSE structures, a limiting eccentricity of L/6 is conventionally used in ASD method. [Reference: Page 92, MSE Walls and Reinforced Slopes Design and Construction Guidelines, March 2001 (FHWA-NHI-00-043)] As we know, the limiting value is derived from the ‘middle third...
  17. Jalthi

    AREMA Trial Wedge Method

    Would you mind posting those pages. Don't have AREMA handy.
  18. Jalthi

    AREMA Trial Wedge Method

    The formula looks like it calculates the depth of tension crack, which is not applicable to c=0 soils.
  19. Jalthi

    Determining axial loading for CU tests

    Check out this forum. http://www.eng-tips.com/viewthread.cfm?qid=272835&page=1
  20. Jalthi

    Negative skin friction and geotechnical capacity

    I assume the project site is in Canada. If so, my understanding of CFEM is that the two loading cases to be analyzed for structural capacity are: 1. DL + drag load but no LL 2. DL + LL but no drag load However, the geotechnical axial capacity is selected to resist DL + LL (Case 2) because...

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