MXRoad ditch design separately

Is it possible road side ditch design separately. I mean we have a road as build survey data and we need have to design side ditch. But ditch will be controlled by embankment shoe and ditch profile.

Is it possible ditch profile can be designed separately road centerline.

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  • Thank you sir.

    But problem is ditch upper edge is fixed distance from embankment shoe. then I dont know where  will touch the ditch bottom. its depending ditch depth.

    In attached image maybe first chainage ditch and next chainage ditch's depth is different regarding ditch profile. But profile must be ditch bottom.

    Its the very difficult to design.

  • Asumptions

    1. You know where the top right of the ditch is - fixed distance from embankment.

    2. You have a string (6D or 3D) which defines the proposed profile of the bottom of the ditch. This can be anywhere in plan within 100m of centreline. (The 100m is default - this can be changed with global option 017)

    Take 2 sets of cross sections - one through ground model (A) and the other sectioning ONLY the proposed profile string (B)

    Use multi-strata interface to start at the known top of ditch position to interface to the (B) section, and then to the (A) section - see INTERFACE example 16 in the Help file. Even though the (B) sections have only one point, that point's level will be used to define the bottom of the ditch, so that the bottom of the ditch will follow the proposed profile.

    This is a simple operation - the only 'strange' thing is that you are using one string to define a 'ground' to interface to - this is in reality the proposed profile.



  • Thanks Sir.

    But Iam not experienced line mode so can you little more explain or is it possible to use just mx tool for design, create, amend something?

  • I will try explain - but I should say you should get line mode experience.

    1. Create a model with only one string (red arrow) which represents the proposed level of the ditch. This string will 'define' a flat plane (yellow dashed line)

    2. Design to the top of ditch as normal (orange arrow).

    3. Do earthwork analysis using 'orange arrow' string as level datum string, and interface to the model create in point 1 (this is like a 'fill' slope). The earthworks will assume (as there is only one string in the 'ground' model) that the 'ground' is flat. This will create the points shown as greenish boxes - i.e. that string will be at the same level as the one created in Point 1.

    4. Design the other side of the ditch (blue arrow).

    5. Interface from the left edge of the ditch back to the normal ground model (green arrow).