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  1. SJcivil

    Horizontal Directional Drilling

    Has anyone had experience with stabilizing the area outside the directional drilled pipe. The normal drilling mud is documented as providing little to no support to the pipe. Therefore, it is hard to make ring deflection calculations work for normal pipe design. I was wondering if an...
  2. SJcivil

    Horizontal Directional Drilling - Bentonite

    Thanks rconnor, have you ever had experience with drillers mixing grout or cement in with the drilling mud or pressure grouting outside the pipe after it has been installed. I would think using cement or grout with the drilling mud would be risky in terms of timing in getting the pipe pulled...
  3. SJcivil

    Horizontal Directional Drilling - Bentonite

    Sorry, I did not mean 100% I was just reiterating that it is in situ soil. That is not really relevant to the question I had though.
  4. SJcivil

    Horizontal Directional Drilling - Bentonite

    I am designing a pipe for an HDD application, the driller is using a Bentonite mixture for his drilling mud. When I do the ring deflection calculation for the pipe what can I assume for supporting soil for the pipe. The Directional Driller has told me that the mud gets very hard after a 24...
  5. SJcivil

    HDPE pipe Under Railway Loading

    Thanks, we have gotten permission to not have to use a casing pipe from the owner, and they have used HDPE DR11 in previous cases, I am doing my due diligence to confirm the design, I just am looking for guidance on evaluating the HDPE design requirements. Thanks
  6. SJcivil

    HDPE pipe Under Railway Loading

    I am trying to directinal drill an HDPE line under the railway with 5 feet of bury, can someone help me with choosing the proper DR ratio.
  7. SJcivil

    Quantifying the amount of Wastewater for a Office Building

    I need to design a small lift station for an office building, is there a resource to help me quantify the design flow for wastewater produced by that building. Thanks SJCivil
  8. SJcivil

    Unreliable Stormwater Outlet

    Thanks for the suggestions, I am leaning to SAM74's direction, even if you test it to see what the capacity is you can't rely on it staying that way in the future. I am in the process of analyzing some software to see if I can model this catchment area to determine the required holding area. I...
  9. SJcivil

    Unreliable Stormwater Outlet

    I have a situation where the existing stormwater disappears into a fractured rock bed in the side of a mountain and disappears. Locals have stated that there may be a cave underneath. Either way it is impossible to determine what its capacity is other than the fact that it has been working up...

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