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?

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.