Subgrade Inspection, and backfill
Subgrade Inspection, and backfill
(OP)
Material Earth-Fill Widen roads for bike lanes
Purpose: Length of trench 23 Metres
depth 2.5 metres
depth of bench 0.6 metres
width of trench 4.5 metres
Recent engineering graduate working as field inspector/quality control
Is settling and cracking, the governing failure mode for roadway filling? How come we only consider, Dry Density and optimal moisture content for compaction, and not other engineering properties such as shear strength.
What happens if the foreman adds another lift when the previous lift fails, how detrimental is this for 5-6 lifts are going to be added?
Purpose: Length of trench 23 Metres
depth 2.5 metres
depth of bench 0.6 metres
width of trench 4.5 metres
Recent engineering graduate working as field inspector/quality control
Is settling and cracking, the governing failure mode for roadway filling? How come we only consider, Dry Density and optimal moisture content for compaction, and not other engineering properties such as shear strength.
What happens if the foreman adds another lift when the previous lift fails, how detrimental is this for 5-6 lifts are going to be added?





RE: Subgrade Inspection, and backfill
RE: Subgrade Inspection, and backfill
first lift has a much lower Dry Density value, compared to 2nd and 3rd lift - you will need to maintain the required percent compaction regardless of the type of material being placed.
what are the effects if another lift is added before the previous one has passed - you had better hope it passes, otherwise you may have to go back, remove it and re-compact it.
RE: Subgrade Inspection, and backfill
soil derived from the bench excavation must meet spec when reused for earth fill. That's also the contractor's responsibility.
Hopefully the engineer defined the material requirements.
f-d
ípapß gordo ainÆt no madre flaca!
RE: Subgrade Inspection, and backfill