Perris Road

Landslide remediation for pipeline

This project involved the remediation of a landslide that had deformed and put pressure on a pipeline. As part of the remediation effort our team was requested to monitor the landslide and design stabilisation and mitigation options to prevent the pipeline from further damage. Geotechnical investigations were undertaken and piezometers were installed to establish the mode of failure and determine whether there was a connection with groundwater. Monitoring involved regular site walkovers to observe any changes and to measure groundwater changes.

Remedial works to reduce strain on the pipeline and provide long term stability of the landslide involved removing landslide debris safely without causing more ground instability; redesigning the slope; drainage system design and installation; excavating and exposing the pipeline to relieve stress and to realign the pipeline; installation of a groundwater monitoring system; and using rudimentary inclinometers to measure possible deformation and movement in the landslide area. Final remediation works were successfully completed in May 2022.

Key Aspects:

Geohazard Assessment
Geotechnical and groundwater investigations (hand augering, soil logging, piezometer installation and measurements, slope stability analysis)
Design of earthworks and drainage system
Destressing and Realignment of pipe