Question

What is the purpose of the mass haul diagram? How is it used in the computation of earthworks for roadway alignments?

Answer 1

Mass haul is defined as the volume of material multiplied by the distance it is moved during construction. A mass haul diagram consists of two objects: a mass haul line, and a mass haul view. The mass haul line represents the free haul and overhaul volumes in cut and fill conditions along an alignment. The mass haul view is the grid on which the mass haul line is drawn.

The middle axis of the mass haul view is known as the balance line. The location of the mass haul line relative to the balance line indicates material movement in the current design. When the mass haul line rises above the balance line, it indicates a region in which material is cut. When the mass haul line falls below the balance line, it indicates a region in which material is fill.

A mass haul diagram presents a graphical view of material moved in the proposed design site, displaying balance points, free haul and overhaul regions, and grade points. They are used to analyze the following aspects of the design:

• Distance over which the cut and fill will balance
• Amount of material to be moved and the direction of movement
• Identification of borrow pits and dump sites.

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