Help please: Model a sloped surface a a rock filled wall in the middle using InRoads

You need more information.  I see two constraints: two 2% slopes.  What else is fixed?  What else can vary and what controls how that varies?  For example, what is the height of the wall defined by?  It is impossible to define it in software if you can't specifiy it in English.  If you can specify it in English, I can do it in InRoads.

Hi Jeff, Thanks for you response.

For the upper surface and the lower surface both we know one side of the surface elevation, the wall's front slope, back slope and the bottom width are known. And there are other information available also. What I am seeking is the general procedure of model similar site.

What I did is model the upper surface and lower surface seperatly by draw three dimensional lines (use the slope to manually caculate the other side of elevation) and import them to the surface.

For the wall I made a template and make the top right corner of the wall to project to the upper surface, and use this template to design the wall surface.

If this is the right approach? I would appreciate if you can share your valuale experience.

Thanks in advance

The general approach is to use the known information that you have.  Generally each segment in a template has two degrees of freedom (slope and width for example).  Either or both of those degrees of freedom can be can be locked to a control, in a variety of ways.  InRoads is very flexible in that regard.  

If you have known 3D lines, you can make them features or alignments and then either use their locations as Template Point Controls (assigned in Roadway Designer) or Target them in End Conditions.  None of that is conceptually complicated, but it all works together.  

Thanks Jeff,

What if I don't have the 3D lines, but I know the elevation at the upper surface where it meets the wall, and of cause the outline (2d) of the surface pad,  then how to model the upper surface?

Thanks Jeff,

What if I don't have the 3D lines, but I know the elevation at the upper surface where it meets the wall, and of cause the outline (2d) of the surface pad,  then how to model the upper surface?

if it's a known elevation you can target a Constant Elevation, or use a Point Control at that elevation.  If the elevation varies along the alignment, you can define that as a Vertical Alignment or a Feature and Target the Elevation of the Alignment/Feature or use it as a Vertical Point Control (the horizontal location of the alignment or feature won't matter when targeting only the vertical).  

My guess is that you have known constraints at both ends and everything in the middle is completely defined by that.  You would be able to make a template to do this automatically.  But you cannot do it if you can't state it clearly and explicity in words first.  I know of a large company that requires their users to sketch it out completely before they start trying to do it in InRoads.  They insist that it saves time to be completely clear up front.

Bentley Institute offers an On-Line Class on February 13 to February 16, 2012 (4 days) called Advanced Roadway Designer for InRoads, V8i (SELECTseries 2) with MicroStation.  It assumes you know the Template basics, and takes you into really advanced territory.  

Thanks again, Jeff, very appreciate your help.

I kind of understand your concept, but still have questions:

1. When you talk about the alignment, are you refer to create an alignment along the boundary of the surface (the outline from the plan view at my previous screen shot), or you refer to create an alignment along the edge of the wall?

2. Your guess was right,  I have known constraints at both ends and everything in the middle is completely defined by that. You mention that we can make  a template to do this automatically, then does the template should be looked like the section I showed in my previous screen shot (a template includes the both upper and lower surface and the wall in the middle) ? then where the alignment should be so the template could run along it?

I will register the training for Feb13 if my boss can approve it. I will find similar training from OnDemand as well. Thanks for the information.