manzanilla-mayaro road presentation from pure

8/10/2019 Manzanilla-Mayaro Road Presentation from PURE

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Manzanilla-Mayaro Road Rehabilitation

Project

Programme for Upgrading Roads Efficiency


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The Manzanilla-Mayaro Road was rendered

impassable as a result of severe structural breaches

in the roads subsurface layers. A prima facie

investigation pointed to the persistent inclementweather experienced over several days preceding

the disaster as the precipitative cause of flooding

and the resultant collapse of the roadway.

CHALLENGE


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The Manzanilla/Mayaro Road:

Approximately 20km in length.

Connects Sangre Grande to Mayaro which

comprises villages of Ortoire, St. Joseph, Beau

Sejour, Plaisance, Pierreville, Beaumont, St. Ann's,Radix, Ste. Marguerite, Lagon Doux, Grand Lagoon

and Lagon Palmiste.

BACKGROUND


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LOCATION

Figure 1 : Location Plan

Alternative routes: Cunapo Southern Road and Plum Mitan


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LOCATION

Figure 1 : Location Plan

Alternative routes: Cunapo Southern Road and Plum Mitan


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PROJECT APPROACH

In order to develop an all-encompassing solution to a

disaster of this scale, the expertise and experience of a jointtask force was engaged, comprising :

Highways Division

Coastal Protection Unit Environmental, Health & Safety Unit

PURE Unit (MOWI)

Engineering Corps TT Army

UWI (Department of Civil and Environmental

Engineering and the Geomatics Department, of the

Faculty of Engineering)


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PROJECT APPROACH

Input was also sought from major stakeholders including:

Environmental Management Agency

Zoological Society

Utility Agencies


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OBSERVATIONS

Figure 2 : Existing Road Structure mainly consisting of layers of : Sand

Boulders, Asphalt


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OBSERVATIONS

Five road failures were initially observed:

Figure 3: Failed Area #1

Failed Area #1

Distance from beach facility - 1.2kmLength 124m

E 0713895

N 1160844


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OBSERVATIONS

Failed Area #2

Length 106m

E 0713944

N 1160646



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OBSERVATIONS


Failed Area #3

Length 40m

E 0713944

N 1160311


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OBSERVATIONS

Failed Area #4

Length 140m

E 0714022

N 1159501



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OBSERVATIONS

Failed Area #5 -

Length 140m

E0714048

N 1159145


Since our initial condition survey, latest reports indicate that a

sixth failure has emerged and the other five failures have

significantly deteriorated .


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PROJECT APPROACH

Concurrent pursuit of both short- term and long

term solutions in a phased integrated approach to

Achieve project objectives.

Phase 1 - Short Term: Restore Connectivity

Reinstatement of roadway.

Installation of Subsurface drainage.

Phase 2 Medium to Long Term: Holistic water

management - Coastal Protection Unit will discuss

Coastal Protection.

Wetland Conservation


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Road condition survey- 100%

Topographical surveys- 100%

Aerial reconnaissance - 100%.

Report acquisition- In progress

Geotechnical investigations- 90%

Hydrological information.- In progress

Tidal information.- In progress

Bathymetric surveys.- To commence shortly

Phase 1.1- DATA ACQUISTION


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Phase 1.2 SCOPE DEFINITION

The philosophy for the restoration works are:

A sustainable approach (temporary works will form

part of the permanent solution.)

Energy saving strategies for the restoration works

will be considered such as; use of recycling

technologies for salvaged and recovered materials

will underlie the design. Establishment of utility corridor within the cross-

section of the roadway.


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DESIGN CONCEPT

Road structure founded on a reinforced flexiblestone, overlaid with a recycled stabilised layer

comprising salvaged aggregate and asphaltic

materials, and surfaced with hot mix asphalt.

Encasement of the subsurface aggregate layers

within water permeable geotextile membrane

allows for water through flow while securing the

structural integrity of the road.

Geometry of the roadway will be constructed as

to maintain the hydraulic balance.


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Phase 1.3 -PROJECT COST-TIME

1.3.1 Preliminary Budget and schedule

Estimated STAGE A Cost of Phase 1 construction -Approximately TT$57M

Estimated Construction Duration: Two months.

Projected Start Date: To be determined


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Phase 1.4 -CONSTRUCTION

During this phase emphasis will be placed on

Delivering connectivity at the shortest time frame.

Construction of Temporary works - Coffer

damming and dewatering in-order to mitigate

flooding of the work zone.


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FIRST PHASE MISSION

Restoration of Connectivity

Reinstatement of roadway.

Re-Installation of Subsurface drainage.


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Thank you

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