A mechanically-stabilized earth (MSE) wall using Maccaferri’s Terramesh System was constructed within the DPWH road widening scheme
The Philippines’ Department of Public Works & Highways (DPWH) decided to widen a section of the Marcos Highway, in San Jose, Antipolo City, Rizal using a mechanically-stabilized earth (MSE) wall to accommodate increasing volumes of traffic. The DPWH engineers designed a 12 metre high and 60 metre long MSE wall using Maccaferri’s modular Terramesh System.
Traffic in the Metropolis is an increasing problem and one which calls for a major program of road improvements to accommodate the increasing volumes of traffic. The DPWH, Region IV-A Office, determined the need to make improvements to sections of Marikina-Infanta Highway, which is an important and busy 110 km mountain road linking Metro Manila with Infanta, Quezon Province. Known as Marcos Highway, or MARILAQUE Highway (Marikina-Rizal-Laguna-Quezon Highway), the road must now accommodate higher volumes of traffic.
The requirement set out by the DPWH was to widen a section of the highway in San Jose, Antipolo City, Rizal using an MSE wall system. Part of the design brief included maximising the opportunity to reuse site-won materials for an economical and speedy to build structure that affords high levels of safety and durability.
Based on the data provided by the DPWH Engineers, a 12 metre high by approximately 60 metre long MSE (Mechanically Stabilised Earth) wall was designed using Maccaferri’s modular Terramesh System . In common with structures of this type, Maccaferri’s MacTex non-woven geotextile was inserted behind the Terramesh System gabion fascia units, as a separator between the unit and the compacted backfill.
Construction commenced in February 2016 with site clearing, drainage works and preparation for installation of the Terramesh System units. The downslope portion of the site was prepared with loose fill materials prior to construction of the MSE wall. Recommendations were given for this section to be further graded and compacted to add additional stability to the bottom portion of the slope. Maccaferri also advised that the lower portion be vegetated with bamboos to provide additional protection against erosion.
As each course of the Terramesh units was laid, the reinforced backfill of the MSE wall was compacted to a minimum 95% of MDD by Standard Proctor. Maccaferri’s MacDrain drainage geocomposite and 100mm HDPE drainage collection pipe were also used behind the structure to aid drainage.
The wall now provides high stability for the roadway above and an additional pavement width of 6.5 metres. The project was completed on-time and within budget by the contractors who said that they found the Terramesh System easy to install.
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