MASS HAUL DIAGRAM



  


  • MASS HAUL DIAGRAM IS GRAPHICAL REPRESENTATION OF AMOUNT OF EARTHWORK INVOLVED IN ROAD CONSTRUCTION AND THE MANNER IN WHICH THE EARTH TO BE HAULED ECONOMICALLY.

  • It gives the cumulative amount of earthwork at any point.
CHARACTERISTICS 
  1. Ordinate at any point represent the earthwork accumulated to that point.
  2. Maximum positive ordinate indicates change from cut to fill in profile.
  3. Maximum negative ordinate indicates change from fill to cut .
  4. Rising curve indicates excess of excavation over fill at the points and depression curve indicates excess of filling over cut at that point.
  5. Steep rise or fall indicates heavy cut or heavy fills.
  6. convex loop(concave down) indicates that the haul from cut to fill is from left to right and concave up loop indicates that the haul from cut to fill is from right to left.
  7. the algebraic difference between any two ordinate is a measure of total earthwork in that section.
  8. Any line drawn parallel to the base line and intersecting two points within the same curve indicates a balance of cut and fill between these two sections. In figure point X and Y indicates a balance section. (Balance points is a point where volume of excavation balanced the volume of embankment)
  9. The area between the balancing line and the mass diagram is a measure of haul between the balance points. 
TERMS

Haul- It is used to describe the distance over which the materials is moved.
Free Haul- It is the distance to which the contractor is supposed to move the earth without additional charge.
Over Haul- It is the distance in excess of free haul for which the contractor will be paid extra for each unit of haulage.
Economic Haul- It is distance to which the material from cutting to filling can be moved more economically than to get material from burrow pit and waste the cutting materials. The economical haul can be determined by equating the cost of roadway excavation plus overhaul and tipping in embankment with the cost of borrow pit excavation and transportation and the waste of roadway cutting material within free haul distance.
Shrinkage- When earth is excavated from borrow area and deposited on the embankment, its volume increases but as compaction is done the final volume of the compacted bank become less than the burrow area volume, This is known as Shrinkage,


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