Charan Sanitwong Road Collapse at Fai Chai Intersection: Engineer Highlights 4 Main Causes
On May 9, 2026, a road subsidence occurred on Charan Sanitwong Road in front of Wichaiwet Hospital, Fai Chai Intersection. The collapse spanned approximately one traffic lane and formed a V-shape, causing a motorcycle to lose its balance and fall. No serious injuries or further damage were initially reported.
Expert Analysis
Prof. Dr. Amorn Pimanmas, President of the Structural Engineers Association of Thailand, analyzed that the issue was not merely surface damage but a "loss of the supporting soil layer beneath the road surface". He identified four primary potential causes:
- Underground Leaks: Potential leaks at the joints of electrical conduits or utility manholes, allowing soil to flow into the pits and create cavities.
- Weather Factors: Recent heavy rainfall making the underground soil soft and more prone to flowing than usual.
- Construction Impact: Nearby excavation or open-pit construction potentially causing soil to shift toward lower points.
- Pipe Failures: Broken water or drainage pipes washing away the soil until the road structure can no longer support the weight.
Recommendations and Monitoring
While this incident was noted to be less severe than the subsidence near Vajira Hospital as it was not directly adjacent to subway construction, this specific area has experienced similar events previously in 2021 and 2023. Consequently, Prof. Dr. Amorn provided several recommendations for the relevant authorities:
- Urgent Underground Inspections: Conduct a detailed investigation of underground utility systems to locate any leak points.
- Utilize Scanning Tools: Regularly use scanning equipment to detect underground cavities or holes, particularly during the rainy season, to prevent recurring hazards.
- Monitor Expansion: Closely monitor the affected area to determine if the subsidence continues to expand.