Reinforced Soil Walls and Slope Reinforcement
ANTIPOLO CITY, RIZAL - REGION IV-A - Philippines
DPWH Region IV-A
January 2016- Before Construction
June 2016 – During Construction
August 2016- During Construction
The Department of Public Works & Highways (DPWH) Region IV-A Office has implemented various road widening programs along the Marikina-Infanta Highway, also known as Marcos Highway or MARILAQUE (Marikina-Rizal-Laguna-Quezon) Highway), a 110 km mountain road that connects Metro Manila with Infanta, Quezon, due to an increasing volume of traffic. A portion of the highway in San Jose, Antipolo City, Rizal required an earth retaining structure system to achieve the desired width of the widened road adjacent to a cliff. In this, an earth retaining structure system that maximizes in situ materials, economical, and easy to build was required by the DPWH engineers.
Based on the data provided by the project proponent, a 12-meter high mechanically-stabilized earth (MSE) wall by about 60 meters long was designed by Maccaferri engineers. Terramesh System in combination with Maccaferri’s high-tenacity woven polyester geogrids for soil reinforcement were recommended. The reinforced backfill of the structure was compacted to minimum 95% of MDD by Standard Proctor. Moreover, the downslope portion of the MSE wall has been found to be composed of loose fill materials that were dumped prior to the construction of MSE wall to stabilize its toe. It has been recommended that the said portion must be re-graded and properly compacted to ensure its stability. Also, it has been advised to expedite vegetation on the exposed slope surface at the toe of the wall to ensure protection against erosion, and planting of bamboos locally abundant in the area can also be incorporated for additional erosion prevention.