This subassembly inserts a paved shoulder with all pavement, base, and subbase layers extended to the shoulder daylight slope.
Attachment
The attachment point is at the inside edge of the paved shoulder, which is typically at the outside edge-of-traveled way.
Input Parameters
Note: All dimensions are in meters or feet unless otherwise noted. All slopes are in run-over-rise form (for example, 4 : 1) unless indicated as a percent slope with a “%” sign.
| Parameter | Description | Type | Default |
|---|---|---|---|
| Side |
Specifes to insert the subassembly either on the right or the left side of the attachment point. |
Left / Right | Right |
| Shoulder Width | Width from the attachment point to the shoulder hinge point. | Numeric |
2.4 m 8.0 ft |
| Use Superelevation Slope | Specifies to use the slope from the superelevation specification defined on the baseline alignment. |
Selection List:
|
No |
| Shoulder Slope Direction |
Specifies whether the shoulder slopes away from the crown or towards the crown |
Selection List:
|
Away from Crown |
| Default Shoulder Slope | Default cross slope of the shoulder surface. This value is used if superelevation slope is not used, or is not specified for the baseline alignment. | Numeric | -6.0% |
| Ditch Width | Specifies width of the ditch from shoulder hinge point. | Numeric, positive |
3.00m 9.00ft |
| Ditch Depth | Specifies depth of the ditch. | Numeric, Positive |
0.40m 1.20ft |
| Subbase Foreslope | The value of the subbase forelsope to tie in the ditch top. | Numeric, positive | 2 ( : 1) |
| Subbase Superelevation | Specifies to use the slope from the superelevation specification defined on the baseline alignment. | List of options: a.) No, b.) Outside shoulder slope, c.) Inside shoulder slope | No |
| Default Subbase Slope | Default cross slope of the subbase surface. This value is used if superelevation slope is not used, or is not specified for the baseline alignment. | Numeric | -4.0% |
| Pave1 Depth | Depth between finish grade and Pave1 (zero to omit) | Numeric, non-negative |
0.025 m 0.083 ft |
| Gap between Pave1 and Pave 2 | Depth reduction of Pave1 to interlace subbase material between Pave1 and Pave2 | Numeric, positive |
0.000m 0.000 ft |
| Pave2 Depth | Depth second level pavement material (zero to omit) | Numeric, non-negative |
0.025 m 0.083 ft |
| Pave2 Trim | Reduced width of Pave 2 material to enable subbase interlacing. Side edge of the material layer will have same slope as shoulder daylight slope. | Numeric, positive |
0.4 m 1.32 ft |
| Gap between Pave2 and Base | Depth reduction of pave2 to interlace subbase material between Pave2 and Base Course | Numeric, positive |
0.01 m 0.033 ft |
| Base Depth | Depth of base course (between Pave2 and Base; zero to omit) | Numeric, non-negative |
0.100 m 0.333 ft |
| Base Trim | Reduced width of Base course material to enable subbase interlacing. Side edge of the material layer will have same slope as shoulder daylight slope. | Numeric, positive |
0.4 m 1.32 ft |
| Subbase Depth | Depth of the subbase layer at the attachment point from bottom of base course (zero to omit) | Numeric, non-negative |
0.300 m 1.0 ft |
| Topsoil Thickness | Specifies depth of material lining along daylight link. If a value of ZERO is entered - then no lining material is added. | Numeric, non-negative | 0.0 |
| Topsoil Shape Code | Specifies shape code for the topsoil material | String | Topsoil |
| Pave1 Shape Code | Specifies shape code for the top layer (below topsoil if enabled) material | String | Pave1 |
| Pave2 Shape Code | Specifies shape code for the second layer material (above base course) | String | Pave2 |
Target Parameters
This section lists the parameters in this subassembly that can be mapped to one or more target objects, such as a surface, alignment, or profile object in a drawing. For more information, see To Specify Corridor Targets.
| Parameter | Description | Status |
|---|---|---|
| Shoulder Width | Can be used to override the fixed Shoulder Width and tie the edge-of-shoulder to an offset alignment. The following object types can be used as targets for specifying this offset: alignments, polylines, features lines, or survey figures. | Optional |
Output Parameters
| Parameter | Description | Type |
|---|---|---|
| Ditch End Slope | Slope of the ditch at the end | Numeric |
| Ditch End Offset | Offset of the end point of the ditch | Numeric |
| Ditch End Elevation | Elevation of the end point of the ditch | Numeric |
| Shoulder Width | Width of the paved shoulder | Numeric |
| Shoulder Slope | Slope of the paved shoulder | Numeric |
Behavior
The finish grade of the shoulder is inserted for the given Shoulder Width and Shoulder Slope outward from the attachment point. Then parabolic ditch links are added as a series of 6 links from the end of the shoulder to the specified width, using the ditch bottom depth as low point of the parabola.
Now the subbase link is inserted from the attachment point offset starting at the Subbase Depth below the finish grade, using default shoulder slope (or the superelevation slope). Other end of the subbase is found by drawing a link from the end of the ditch with the subbase foreslope as shown in the illustration.
If topsoil material is set with “a positive” value then a new material layer is introduced to the specified thickness right below the daylight link. The thickness is measured perpendicular to the parabolic ditch shape. Top of the ditch is drawn from the shoulder hinge point to the specified width and the ditch depth. On inside edge of the ditch a link offset link is added (along the shoulder link) so that the specified ditch topsoil depth is achieved. Similarly a horizontal link is added on the outside end of the ditch. Now using these two and the topsoil thickness, reminder of the parabolic topsoil bottom is created. Due to this new layer provision, width of the shoulder top layer will be adjusted as shown in the following illustration.
The Pave1, Pave2, and Base surface links are inserted parallel to the finish grade at the given depths. Bottom of the Pave1 link is always extended to the daylight link. If Pave 2 and/or Base Trim values are set to zero value – then the top links of these layers will be extended to the offset of “bottom link of the previous layer”. Bottom links of these layers are extended such that slope of the wedge formed on the side is same as the ditch start grade (Note: compute the start grade of the parabolic ditch using three known points of the parabolic equation).
If the above trim values are set for a positive value then top of respective material will be shortened by that value and the bottom link will be derived with material side slope equal to the daylight slope.
Further, if the “gap between Pave1/Pave2 and/or Pave2/Base” is set to a positive value – then those lavers will be separated by that gap as explained in ShoulderWithSubbaseInterlaced subassembly.
Layout Mode Operation
In layout mode this subassembly displays the links comprising the shoulder with default parameters assigned to it.
Point, Link, and Shape Codes
The following table lists the point, link, and shape codes for this subassembly that have codes assigned to them. Point, link, or shape codes for this subassembly that do not have codes assigned are not included in this table.
| Type | Codes | Description |
|---|---|---|
| P2 | EPS | Edge of paved shoulder, finish grade |
| P3 | Daylight_Sub | Subbase daylight point |
| P5 | EPS_Pave1 | Edge of paved shoulder on Pave1 |
| P7 | EPS_Pave2 | Edge of paved shoulder on Pave2 |
| P9 | EPS_Base | Edge of paved shoulder on Base |
| L1, L2 | Top | Finish grade of the shoulder |
| L3, L4 | Datum, SubBase | |
| L5 | Pave1 | |
| L6 | Pave2 | |
| L7 | Base | |
| S1 | User Defined Code | User defined code for top layer of shoulder (default - Pave1) |
| S2 | User Defined Code | User defined code for second layer of shoulder (default - Pave2) |
| S3 | Base | |
| S4 | SubBase | |
| S5 | User Defined Code | User defined code for topsoil material (default - Topsoil) |
Coding Diagram
