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  1. geomo

    Excel VBA Embedded Chart Formatting

    I posted this in the VBA forum last week with no luck... I'm trying to use an embedded chart in an Excel sheet where I want to switch between multiple data sets, and I only want to see one data set at a time. I can do this without a problem, but the size of the chart area needs to remain...
  2. geomo

    AutoCAD VBA - Polygon

    The following code example draws a closed rectangular polyline (of a size representative of an architectural masonry block), puts it on layer "srw", and gives it a linetype scale of 1/3. The thing to remember is that even if using a 2D polyline, you need the 3D set of points...
  3. geomo

    Excel Embedded Chart Formatting

    I'm trying to use an embedded chart in an Excel sheet where I want to switch between multiple data sets, and I only want to see one data set at a time. I can do this without a problem, but the size of the chart area needs to remain constant while I change the scale settings for the chart...
  4. geomo

    cofferdam

    What about vibrating the piles in place? There are some really powerful vibrators, some excavator mounted, that might work nicely in your saturated, very dense, cohesionless soils. The vibrator would create a temporary quicksand condition at the pile tip, considerably reducing the penetration...
  5. geomo

    Retaining Wall without heel and toe

    Sounds like your designing a cantilever wall that will behave like the stem of a wall w/ no footing. The reinforcement you design for the wall stem can be extended as anchors into the limestone to handle the shear and moment for the whole system. However, consider using a lot of reduncancy to...
  6. geomo

    Anchors for concrete block retaining wall

    If you use a cementatious grout in contact with the geogrid, be careful about chemical degradation of the polymers. Some geogrids can handle it and some can't. HDPE grids, like Tensar, are OK. Some polyester and polypropylene grids have problems. PVC is probably OK, but installation damage to...
  7. geomo

    SRW Maximum height record on one single tier

    I think I remember hearing of one over 100', maybe 125', in Hong Kong, maybe elsewhere in SE Asia, at least a year ago. It could have been facing a rock cut/slide area, so not subject to same loading and design conditions as typical SRW. Nonetheless, photos were impressive.
  8. geomo

    rock dowels, anchorage, cohesion intercept

    Do you want a cohesion, c-value for designing rock dowels/bolts/anchors? If you want a value to determine the pullout capacity of the dowels, then you want the bond strength, not cohesion. This is a great reference paper: Littlejohn, G.S., "Design Estimation and Load Holding Capacity of...
  9. geomo

    Doubt on Monobe Okabe Coefficients.

    I am not sure, but I think the higher active pressure is a pseudo-static active pressure taking into account the inertia of the retained soil mass acting on the retaining wall. It is a crude way to model a dynamic response using static methods. For the passive coefficient, again I am not sure...
  10. geomo

    Retaining wall / Slope stability design

    The reinforced slope will help you to make that portion steeper, but a steeper slope on top of a retaining wall will actually increase the surcharge load, whether reinforced or not. Where steepened slopes are used over a retaining wall, there aren't always clear methods of determining how that...
  11. geomo

    Retaining wall / Slope stability design

    For highway projects it is common for the local DOT to take responsibility for global stability. Some commercial projects require wall construction in the DOT right-of-way or walls that support DOT facilities. In those cases the local DOT will probably have the same jurisdiction as they would...
  12. geomo

    Anchor Rods

    Your anchored bulkhead is similar to temporary excavation support systems that also utilize tiebacks and sheetpiles. In those projects the standard practice is to apply a load, usually with a hydraulic jack, at the connection of the tieback to the sheetpiles. The deflection vs. anchor load is...
  13. geomo

    Retaining wall design: need help

    It will be difficult to keep the 1:1 slope stable, as ishvaaag noted, and the slope will also put a surcharge on the wall, making it more difficult to calculate earth pressure on the wall unless the phi angle is greater than 45 degrees. There are many companies that supply materials for...
  14. geomo

    Gravity retaining wall design

    Get this reference: Collin, James G., Ph.D, P.E., Editor, "Design Manual for Segmental Retaining Walls," Second Edition, Second Printing, National Concrete Masonry Association (NCMA), Herndon, Virginia, 1997. Also get the program, SRWall2.1 from NCMA. Call (703) 713-1900 and they will...
  15. geomo

    How do we design retaining walls to retain stiff soils

    RE: Ginger's reply, more questions to ask are: How long will it take for rock to weather into a soil-like state? What is the design life of the proposed structure, and can the rock be expected to remain intact during that life span? If earth pressure from stable rock is a lower bound, and...

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