Options

Quality Targets

Specify the highest/lowest number of times the weight must be dropped at each location (similar to pass counts for roller and impact compaction), e.g., if you set the minimum to 12 and the maximum to 14:

• <12 is below tolerance
• 12 - 14 is within tolerance
• >14 is above tolerance

You could also set the minimum to 12 and the maximum to 20 (or a similar unreasonable number), which effectively turns this quality target into a pass/fail target.

Specify the average maximum vertical distance that the impacted ground can move in the last two drops, as calculated by DPS900 in the field. The value is positive when displacement occurs. Any value over this number is deemed a failure if used in the quality check.

Drop locations objects are created at 0,0 elevation. Vertical displacement is measured from that elevation.

Specify the 2D/horizontal accuracy tolerance for the drop location, which is the maximum horizontal distance from the planned drop location to the as-build drop location. This indicates how close the operator needs to get to the planned drop points, e.g., if you set 20 cm as target:

• <20 cm is within tolerance
• >20 cm is out of tolerance
• Any value over this number is deemed a failure if used in the quality check.

Enter the required impact energy in kilo-Newton-meters for the first drop, as defined by the engineering plans. This value is defined by the mass of the tool x gravity x height of the tool above ground when dropped (e=mgh).

Check the box for each quality target that is required for pass/fail metrics.

Layout

Enter the distance between columns (horizontal in the Plan View). This is the distance between the center point of the weight at each drop location.

Enter the distance between rows (vertical in the Plan View). This is the distance between the center point of the weight at each drop location.

2D edge tolerance

Edge tolerance is applied to inclusion and exclusion boundaries. Specify the maximum distance a drop location's center point can be outside of the compaction area. This is the distance tolerance (from the tool's center point) used to ensure sufficient drop location coverage within the inclusion boundary.

For an inclusion boundary, a positive edge tolerance is applied outside of the boundary and negative goes insides the boundary. For an exclusion boundary, the opposite is true. A positive edge tolerance is applied inside and a negative tolerance goes outside.

Note: If dynamic compaction plans overlap, duplicate drop location objects can be created in the same location.

Tool

Enter the size of the tool. Typically, this is the diameter of a circular weight or length of one side of a square weight.