CHENNAI METRO RAIL NEWS LETTER

Creativity
can
solve almost
any
problem.
The creative
act, the
defeat of
habit
by
originality,
overcomes
everything.
George
Lois
Caption describing picture
or graphic.
Quaity control in CMRL Depot works at Koyambedu
A specific Project Quality Plan (PQP) has been approved and followed for Koyambedu Depot
work. Required Quality Control Team to ensure quality of work has been engaged by contractors
and General Consultants. An independent audit wing of General Consultants also established to
audit the quality of works.
Earth filling & Ground Improvement works:
As per the scope of work a huge earth filling work about 4 lakhs cum is involved in the Koyambedu
work including ground improvement work. The contract provides details of quality control
tests to be conducted for selecting the fill material as well as for earth filling work. The samples of
fill material are tested for particle size distribution, liquid limit, plasticity index, coefficient of uniformity,
free swelling index, sulphate content, optimum moisture content, and maximum dry density
as per PQP. The samples are tested for the moisture content and relative compactions
(FDD) as per contract provisions.
* 294 samples from 23 quarries have been tested for fill material to ascertain the suitability of
the soil as per specifications;
* 3004 samples of soil have been tested for FDD (Field Dry Density) to ensure 98/95% of
MDD as the case may be;
* The settlement of the soil filling is monitored by measuring the settlement through the settlement
marker installed at prescribed spacing; and
* Similarly the pore water pressure of the water in the soft day layer is measured by means of
Piezometers.
Concrete for piling work
Piling work of 600mm dia.(driven cast in-situ) is in progress. Quality control test for concrete in
the field has been conducted as per PQP.
* 645 concrete cubes have been cast so far and it is a continuous process as the concreting in
progress. So far 243 cubes are tested (7 th and 28 th day) as per specifications.
Piezometer Reading in progress Plate Settlement Marker reading in Progress
Progress of Depot work
The up-to-date progress in Depot work is as follows:
Sl. No. Description Unit Qty
1 Earth filling Cum 142787
2 Installation of Prefabricated Vertical Drain(PVD) RMT 880955
3 Surcharge filling Cum 64297
4 Test piles of 600 mm dia (Admn. Bldg. and shed) No 4
5 Working piles of 600 mm dia (Admn. Building) No. 88
Page 2 Chennai Metro Rail Newsletter