28/07/2025
TECHNICAL OBSERVATION ON THE RECENT LANDSLIDE AFFECTING KENNON ROAD TUNNEL PROJECT
Recently, a landslide occurred near the newly constructed tunnel along Kennon Road, prompting public concern—especially after this photo surfaced online. As a professional in the field of architecture and construction, I believe it’s important to offer an objective technical review, not to point fingers, but to open a dialogue on lessons learned and how we can improve our infrastructure moving forward.
🔍 Observation Based on the Image:
1. Lack of Structural Support Beneath the Tunnel Section
From an engineering perspective, the exposed condition of the tunnel base suggests a potential deficiency in slope stabilization and foundation anchoring. It appears that the tunnel extension was placed on a cut slope without sufficient deep foundation elements or retaining structures to resist erosion or washout.
2. Insufficient Erosion and Landslide Mitigation Measures
Given Kennon Road’s high-risk location for landslides—especially during heavy rainfall—standard practices such as soil nailing, gabion walls, retaining walls, or deep pile foundations should have been explored more rigorously. There’s also a notable absence of slope protection systems like shotcrete or vegetative stabilization in this exposed zone.
3. Geotechnical Due Diligence?
One has to ask: Was there a thorough geotechnical investigation for the slope stability, soil bearing capacity, and hydrology of the area? Infrastructure in mountainous terrains demands specialized solutions based on site-specific soil and rock behavior, not just standard road construction templates.
🔧 Our Takeaway as Design and Construction Professionals:
Projects in geohazard-prone areas like Kennon Road demand more than just civil design—they require integrated geotechnical and structural planning, risk mitigation strategies, and a long-term maintenance mindset. This isn’t just about building roads—this is about building resilience.
🚧 Let’s use this moment to reflect on how we approach infrastructure design and ex*****on in the Philippines. Our terrain and climate are challenging, but not impossible. It only takes science-based planning, transparency in implementation, and genuine accountability to get it right.
🛠 If you’re in the AEC industry, let’s continue to advocate for stronger technical reviews and inclusive design processes, especially in government projects. The safety of the public—and the integrity of our profession—depends on it.
