describing grading slopes for transportation projects

Landscape Architecture for Landscape Architects Forums GENERAL DISCUSSION describing grading slopes for transportation projects

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  • #3559662
    Stephanie Smoot
    Participant

    I am working on a Design build narrative for some large earthwork roadways at an interchange. In particular, i would like an engineer to understand what I want.

    1. I would like to describe a overall naturalistic contouring objective so that the roadway embankments of up to 20 feet high aren’t uniformly 2:1 slopes intersecting abruptly into the flat horizontal layout.

    2. How do I describe the grading practice at toe of slope conditions where I want the profile of the slopes to transition smoothly from the vertical plane (up to 2:1 slope) to the horizontal plane rather than changing abruptly. Some call it a “seam”, but I am wondering if there is an engineering term. One thought I had was to try to describe the profile of the slope as similar to the profile of a roadway where you identify algebraic differences and make tangent curves such as ” the algebraic difference of the intersecting curves shall not exceed 33%” but i wasn’t sure if that will get me in a hole. Maybe “toe of slope shall be smoothly graded at 3:1 or less steep to prevent an abrupt visual change of grade?”

    #3559663
    Andrew Garulay, RLA
    Participant

    The simplest way would be to say that you would like the lower slope concave and the upper slope convex, or so I think this is what you want to describe.

    #3559664
    LM
    Participant

    If you know how much room you have, you can state that the transitions from the 2:1 slope at the top and toe shall occur smoothly in no less than (for example) ten feet.

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