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Sr.No. Major Activities Technical Risk Observed at Site Mitigation strategy Adopted/Suggested

1 Exavation Safe bearing capacity of soil Minimum S.B.C. should be 45 tonnes / sqm

(FOS = 1.5) or Chemical consolidation of soil

Seepage of water from adjacent land Constructing Drains or Freezing process

Shifting of service lines Shifting of service lines is Hudas responsibility

Damage of water lines/sewage lines/electrical

lines

Damaged to service lines will be equally shared by

contractor

Settlement of foundation

Load cells placed in foundation to check the

settlement & to take suitable preventive measures

Alignment problem because of temple &mosque.

Its an Huda's responsibility

2 Foundation Concreting Quality of materials, Site conditions, Mixing &

Placing Methods

Testing of materials, Concrete should be laid in

layers not exceeding 15 cm in thikness

3 Procurement Inventory of Mac alloy bar used for lifting

operation. Cost Rs. 180/Kg

ABC analysis for major items like Mac alloy bar

which can be used for proper stock maintenance

4 Profiling of tendon bars used

for pre stressing

Used for proper stress distribution. Risk of

collapse of structure due to uneven stress

distribution

Check list should be prepared, followed by engineer

inspection

5 Alignment Change in alignment will cause risk of excessive

cost & completion time of project

Provide detail drawings with checking points

&intermediate levels

6 Crash Barriers Risk of crash barrier fall down due to improper

tieing which may lead to accident

Crash Barrier bars should be welded with the deck

slab reinforcement

7 Faulty design, material &

workmanship

Risk of bad quality, excessive cost &

completion timeClause of liquidity damages & penalty will help to

mitigate such risks

Observed Technical Risks & its Mitigation Process in PVN Elevated Expressway

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8 Bearings Damages during installationRisk: Excessive cost & time

Poor bedding & Inaccurate positions

Risk: Improper load distribution

9 Creep Creep increase the deflection with the time and

may be critical consideration in design.

Creep can cause to cracking to interior of

surface lead to failure of elevated structure

10 Shrinkage

Risk of reduction in volume which may

developed cracks at the surface

Preventing the rapid loss of water from the surface.

Thus it can be done by covering the surface with

polyethylene sheeting.

Affecting the strength of the structure

Carbonation of concrete also results in increasing

the strength of concrete and reduces permeability.

Used expansive cement or shrinkage compensating

cement

11 Temperature variations Temperature variation may lead to deveopment

of cracks in the structure

Fixing of expansion joint to absorb expasion and

contraction

12 Live load and Dead load Live load and dead load lead to various type ofmovement in the elevated expressway.

Provide damping of vibrations and minimize effectsof impact loading

14 Equipment Risk

Launching Girder Risk of derailing of launching girder

Risk of tiliting of launching girder

Risk of collapse of segment due to improper

support

Steel shims method: Bearing is correctlypositioned and leveled on steel shims and the

remaining space filled with a grouting material.

Proper mix design of concrete & use of lesser water

cement ratio

The 300 tonne launching girder can be stabilised by

giving support to it. Barricade area & movement of

people should be banned in case of emergency.

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