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Recent content by voi

  1. voi

    Ground floor slab in area with High water table

    We founded the footings at 5 m because that is where we encountered firm material. I like the idea of Ron of applying coal tar and placing lean concrete. The only concern is the cost. Backfilling entire 5 m with lean concrete will increase the cost.
  2. voi

    Ground floor slab in area with High water table

    We have a site where up to 5 m the ground is silty clay. We removed the entire clay and reached rock. The building is founded on rock at about 5 m below ground with columns/ pad footings and the walls are supported on strip footings also on the rock. We are near an area with high water table so...
  3. voi

    Structures on Geothermal terrain

    We recently carried out geotechnical investigation on a hill and we seem to have struck a geothermal zone. We drilled a borehole up to 10 m and we encountered steam. The steam has not stopped even after two weeks. The logs are all rocky highly weathered. Our client wants to construct a high...
  4. voi

    Steep Rock Slopes

    No Miningam. The comments by RobPE are very educative and exciting. What he has brought to my attention is before I think about software or analysis of the slope I should look at the rock mass in its entirety. He points out that at 25 m deep excavation is very unlikely to happen far from the cry...
  5. voi

    Steep Rock Slopes

    The comments by RobPE is great and highly appreciated it. I am not sure why he feels the Hoek Brown has no applicability for Rock slopes. Are you suggesting that theories such as Mohr - Coulomb are better.
  6. voi

    Steep Rock Slopes

    Hi Bigh, In my initial note I just wanted to know where I can obtain software on steep slopes. Swiver mentioned rockscience and swedge. That is the input i was seeking.
  7. voi

    Steep Rock Slopes

    I know it is difficult for one with mining background to understand the complexities of slope stability. I am from the local council department and the consultants ( by the way the project is being handled) by a consortium of Geo-technical firms with international experience They have submitted...
  8. voi

    Steep Rock Slopes

    Hi Swiver, Thank you for responding to my thread. I have a case where we are excavating four basements down ( 25 m below ground). The area is urban and the terrain is all rock. I know SLOPE/W implements the Generalized Hoek-Brown but it is very expensive. So I am looking for any other ideas or...
  9. voi

    Steep Rock Slopes

    Hello, I need an input in how to analyze steep rock slopes. I particularly are interested in software that can assist me in the analysis, thanks Voi
  10. voi

    underpinning on weak soil

    I have a project of a four level building constructed using natural stones for the walls and the strip footings,beams and floor slab are all constructed in RC. The contractor had founded the building on rock at 1.5 m but after completion it started having large settlement cracks. We were then...
  11. voi

    PILE CAP DESIGN

    Hi, I need to understand how to design a pile cap carrying several column loads ( not one column) scattered over the pile cap. All the cases I come across is a single column load supported by 2, 3, 4 etc piles. If I am to assume the total loadings from the columns is at the centroid what column...
  12. voi

    Percussion vs Rotary drilling

    Hi All, Thanks for all the comments and suggestions. It was quite educative.I would like to thank particularly BigHarvey for the paper on vibrations. voi
  13. voi

    Percussion vs Rotary drilling

    Hokie 66, I also do not have experience with any kind of Piling. I work with the local authorities in the geotechnical section and this issue has been put in front of my Boss by the consultants who have objected to the contractors method. So I wanted to hear what others on this forum would say...
  14. voi

    Percussion vs Rotary drilling

    Hi Most of the answers have concentrated on the design aspect. What about the issue of percussion vs rotary drilling as the heading on the post mentions. Percussion using the method the contractor wants use is basically hammering into the ground and smashing the rock. This method will have...
  15. voi

    Percussion vs Rotary drilling

    hokie66, yes the contractor is not changing the number of piles. He says he does not have 600 mm casings but a lot of 1000 mm casings and his procedure for socketing is not in dispute. The cleaning and removing of cuttings is with use of bentonite. The Geotechnical Engineer feels that 1000 mm...
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