Voids in rock stock pile
Voids in rock stock pile
(OP)
I am working on an earthworks project and have to come to an agreement with the contractor for the volume of rock (solid boulders) excavated. The contractor has surveyed the rock stock piles using a total station and computed the volume using modeling software. We are reasonable comfortable with the total volumes however we think that there should be a deduction made for voids (air) within the stockpile. We are suggesting a 30% deduction for voids; naturally the contractor is in a disagreement. Has anyone come across any supporting information that determines the amount to be deducted for voids in a stockpile?
Regards,
Snatch
Regards,
Snatch





RE: Voids in rock stock pile
RE: Voids in rock stock pile
If it is not spelled out in the project specs, see if there are other specs referenced in such as APWA, which may then clarify.
RE: Voids in rock stock pile
RE: Voids in rock stock pile
Cvg: The boulders are already transported/deposited offsite
Rgds
Snatch
RE: Voids in rock stock pile
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Voids in rock stock pile
Rock, blasted: 4000 pcy in bank; 50% swell; 0.67 swell factor; 2680 pcy loose wt.
Shale: 3000 pcy in bank; 33% swell; 0.75 swell factor; 2250 pcy loose
Sandstone: 4100 pcy in bank; 54% swell; 0.65 swell factor; 2700 pcy loose
Swell factor "is a factor to convert loose cubic yard weight to the bank cubic yard weight, and is used by the estimator as he considers both the net volume of pay yards being excavated, and the volume of loose yards which is actually carried in the dipper" (of a hoe bucket).