Safety Flash
Well drilled in the wrong place breaches railway tunnel
Well drilled in the wrong place breaches railway tunnel
- IMCA
- Safety Flash
- IMCA SF 15/19
- Competence and TrainingControl of Work
- Structural and asset integrity
- Drilling
- Control of work
- Construction
Summary
An exploratory well drilled during a Paris underground railway extension breached an existing tunnel, admitting groundwater and mud and closing the line for three days. No injuries were reported. The flash identifies missing client approval and surveyor validation, and recommends obtaining professional surveying advice for positioning operations.
Classifications: Structural and asset integrity; asset integrity; structural integrity.
Classifications: Drilling; well drilling.
Classifications: Control of work; work control.
Classifications: Construction; construction industry.
Summary
An incorrectly positioned test well breached a railway tunnel, causing a major groundwater and mud inrush.
IMCA SF 15/19. Themes: competence and training, control of work.