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Slope Management and Landslip Preventative Measures Development of the Hong Kong System

Slope Management and Landslip Preventative Measures Development of the Hong Kong System. Major Landslide at Maracas, Trinidad - Late December 2002. Prevention of Landslides. Database of Slopes Type of Slope Condition Consequences. Cut Slopes Fill Slopes Retaining Walls

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Slope Management and Landslip Preventative Measures Development of the Hong Kong System

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  1. Slope Management and Landslip Preventative Measures Development of the Hong Kong System Major Landslide at Maracas, Trinidad - Late December 2002.

  2. Prevention of Landslides • Database of Slopes • Type of Slope • Condition • Consequences • Cut Slopes • Fill Slopes • Retaining Walls • Hybrids: Cut/Retaining Wall / Fill/Retaining Wall • “Natural” Slopes - slopes where there has been no anthropogenic activity, or where such activity is causes small changes to the geometry of the slope so that the Factor of Safety is largely unaffected.

  3. Development of Slope Registration Scheme • Began in late 1970’s based on geographic map area • e.g. 11SW-A • followed by a code • C - Cut Slope : F - Fill Slope • R - Retaining Wall : N - Natural Slope • CR - Cut Slope with Retaining Wall • FR - Fill Slope with Retaining Wall • followed by a number i.e. 11SW-A/R188 refers to Retaining wall 188 in Map area 11SW-A

  4. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 NW A NE B SW C SE D Hong Kong Slope Catalogue Map Referencing Scheme 11SW-A

  5. Some recent Landslides in Trinidad • There is NO proactive system in place • Everything is Reactive

  6. Landslide at Maracas December 2002 December 2004 – note the slide is much more extensive

  7. December 9th Landslide 3 km beyond Las Cuevas as seen on TV half of road blocked Landslide 11th December 2004 at approximately 13:00 1 km before Las Cuevas half of road blocked

  8. Slope before failure at Couva Slope after Landslide Slide by Derek Gay, UWI

  9. Could we improve on Hong Kong System? • A unique number code irrespective of feature type • Allow for more codes e.g. NRF - natural-retaining-fill • Or RC as well as CR? • What about including a code for stability • e.g. L – Landslide • S - Stable • P – Preventative Works done etc • 43D-1a/RCN-002/L • Retaining wall beneath cut slope then natural in area 43D-1a • Reference number 002 - landslide has occured

  10. Best way to record information • Map Reference • need to have a good map at time of recording • GPS – convert to Map Reference • need to have GPS • (software needs to be written to convert to Map reference) • Chainage – • Most roads in Trinidad have chainage markers at 25 m intervals • Easy to record • Needs some thought to convert to GPS and hence Map Reference • Most simple method for basic recording

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