Drawing Flow Nets in Geotechnical Engineering

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  • Опубликовано: 4 дек 2024

Комментарии • 41

  • @roboarmy357
    @roboarmy357 Год назад +3

    Thank you for this video, this makes so much more sense! You are the best!

  • @katsuragrey
    @katsuragrey 3 года назад +2

    Welcome back sir, thank you so much for the upload!

  • @Leeshixo
    @Leeshixo 7 дней назад

    Best video ever! Thank you kind sir ❤

  • @nathancommissariat3518
    @nathancommissariat3518 Год назад +1

    thanks for the video! About to start learning about this in class on Monday :)

  • @MrRICHARDGOMEZ
    @MrRICHARDGOMEZ Год назад

    Thank you For sharing your knowledge. Very helpful.

  • @sethaho2747
    @sethaho2747 2 года назад +2

    Super helpful, thank you!!!

  • @mathiaspedersen1965
    @mathiaspedersen1965 2 года назад +4

    Great video got a exam in this tomorrow, you answered some question my book couldnt :D

  • @arifhossainshah6346
    @arifhossainshah6346 Год назад +1

    Thank you

  • @lewisgilmour3434
    @lewisgilmour3434 7 месяцев назад +1

    very good helpful video

  • @omarDababa23
    @omarDababa23 Год назад +2

    thank you so much ❤️,
    so basically Nf= is most of the times given and it is no of channels? and Nd is basically up to us?

    • @EngineeringEconomicsGuy
      @EngineeringEconomicsGuy  Год назад +2

      Yes, Nf is the number of flow channels; it is not usually given, but drawing the flow net with 3-4 channels usually works out. Fractional channels are also possible. The number of Nd will be determined by how well you follow the rules for drawing the flow net. Don't over think it - just draw!

  • @khashayarsamiee
    @khashayarsamiee Год назад +1

    Thank you for the video. at the end we found the seepage rate but how can we compare it to allowable rate ? how can we use it for proof of safety ?

    • @EngineeringEconomicsGuy
      @EngineeringEconomicsGuy  Год назад

      Good question. There is not typically an allowable seepage rate, therefore we are not able to calculate a 'factor of safety' in the same sense we would for bearing capacity, or other geotechnical calculations. We would use the calculated seepage rate for something like selecting the capacity of de-watering pumps for a project - i.e. we would supply pumps that could keep up with the seepage we anticipate - and we might size the pumps 3-4 times what the calculations suggest. This would be the closest thing I could think of to a 'factor of safety' for seepage. Hope this helps!

  • @oliverd8524
    @oliverd8524 Год назад +1

    thanks that was beast

  • @vanskis7618
    @vanskis7618 27 дней назад +1

    so drawing the flow nets is arbitrary? I can draw one with more drops or less drops?

    • @EngineeringEconomicsGuy
      @EngineeringEconomicsGuy  27 дней назад +1

      Yes. As long as you follow the rules for drawing the flow lines and potential lines, the 'ratio' of the number of flow channels to number of potential drops should be approximately the same.

  • @mohsenbodaghi8044
    @mohsenbodaghi8044 Год назад

    thanks man that was great

  • @adithyasundar2017
    @adithyasundar2017 2 года назад

    Thank you very much for the video, But how can you predict water goes in a particular path in soil, At 5:12 you said that "water is going to go down then around the tip of sheet and go up" why does that happen

    • @EngineeringEconomicsGuy
      @EngineeringEconomicsGuy  2 года назад

      Thank you for the question. Water is 'driven' (i.e. - flows) from regions of high-pressure to low-pressure. The difference in the elevation of the watertable on either side of the sheetpile wall creates this pressure difference. The flow net is a way to predict the path that the water will follow. The flow net method is based on the assumptions that water does not 'cross-over' itself - it only flows in continuous 'parallel' paths. It is also based on the assumption that the flow into an 'element' of the flow nets equals the flow out of the same element. These assumptions come from the french mathematician Laplace - you can read more in any textbook or on the internet, if you are interested.

  • @niksugden1096
    @niksugden1096 2 года назад +1

    How do I know how many equipotential lines to draw. Do I need to calculate each one?

    • @EngineeringEconomicsGuy
      @EngineeringEconomicsGuy  2 года назад +2

      Believe it or not, any number of equipotential lines will work! BUT, you must follow the rules for drawing the flow lines and equipotential lines. If you follow the rules, the RATIO of the number of flow channels to number of equipotential drops should always be about the same regardless of how many lines you draw. Hope this makes sense. Thanks for the question.

  • @lisho6806
    @lisho6806 3 года назад +1

    Thank you sir

  • @jamescavalari3977
    @jamescavalari3977 11 месяцев назад

    So you can get a different answer by just choosing to draw a different number of lines? I don't buy it. lol I could easily see 2 or 3 people legitimately following the super-vague rules of drawing a flow net, and getting 2 or 3 different ratios of Nf to Nd.

    • @EngineeringEconomicsGuy
      @EngineeringEconomicsGuy  11 месяцев назад +1

      This is a common observation made by students. If you follow the rules perfectly, everyone should get a value of Nf/Nd within +/- 10-15%. This kind of accuracy is well within the acceptable limits for geotechnical engineering. In fact, there is probably more uncertainty and assumptions in the value of the hydraulic gradient! Think about drawing twice as many flow channels...if you follow the "rules" you will need twice as many equipotential lines...and you'll get the same ratio!