Volume-IF - JantERmantER

DCPL-K4A02
3.8.0 Earthwork in Filling
3.8.1 Area Filling for Grading
The material to be used for area filling shall be selected material
capable of being compacted to the requirements stated herein below and
approved by the Engineer, obtained directly from excavation for area
grading, from nearby areas where excavation work by the same agency is
in progress, from temporary stacks of excavated spoils or from borrow
pits in selected areas designated/approved by the Engineer. The quality
of the material shall conform to that mentioned in clause 2.5.2 of this
specification.
Where excavated material is mostly rock, the boulders shall be broken
into pieces not longer than 150 mm size, mixed with properly graded
fine material consisting of murum or earth to fill up the voids and the
mixtures used for filling.
If any material is rejected by the Engineer, Contractor shall remove the
same forthwith from the site at no extra cost of the owner. Surplus fill
material shall be deposited/disposed of as directed by the Engineer after the
fill work is completed.
No earthfill shall commence until surface water discharges and streams
have been properly intercepted or otherwise dealt with as directed by the
Engineer.
Before commencement of area filling the existing top soil shall be removed
upto a minimum depth of 150 mm, or more, as directed by the Engineer
in order to clear the surface of undesirable materials. After this the
filling operation shall be performed with earth in layers not exceeding 250
mm, loose thickness. Successive layers shall not be placed until the
layer under construction has been thoroughly compacted to the
specified requirements as given below and got approved by the Engineer.
a) Each layer of earth of cohesive in nature shall be compacted to 90%
of proctors dry density unless otherwise permitted/directed by
the Engineer.
b) Each layer of earth of non-cohesive in nature shall be compacted
to minimum 75% relative density unless otherwise permitted/directed
by the Engineer. Each shall be compacted with approved machine
(mechanical plant) and usually manual compaction shall not be
allowed unless specifically permitted by the Engineer. The
original ground formation and each fill layer shall be compacted by
rollers as described below with a maximum of six posses of 8/10
tonne roller.
i) When the optimum moisture content of soil is relatively high, a
pneumatic tyred roller (type pressure 3.0 - 3.5 kg/sq.cm) shall
be considered to give better performance for mechanical
compaction.
(PCA.774.S034sca) V.II-D2/S-I : 15