HONG KONG
CAPE COLLINSON RD. BUDDHIST CEMETERY LANDSLIP PREVENTION
- MARKETS :
- Slopeland development
- SERVICES :
- Geotechnical Engineering
Structural Engineering
- SCOPE OF WORK :
- Site investigation and stability assessment
Soil nails and raking drains design
Concrete buttresses design
Construction supervision
Keeping slope cemetery safe
Space is scarce in Hong Kong, and cemeteries are often built on mountain slopes. The slope under investigation is a 50 m long cut slope up to 19 m high, and consists of three 50 degrees steep slope flights separated by intermediate berms. Behind the slope crest is a catchwater, possible leakage from which has been considered in the stability investigation. Upgrading measures implemented to bring the slope to current safety standards include re-profiling, soil nailing, raking drains and concrete buttresses. The soil nails are maximum 11 m long and provided with solid copper wire with insulation for non-destructive test using the time-domain reflectometry method to verify the length of soil nails installed and the quality of grouting. Fifteen pull-out tests have been carried out on trial nails to verify the design assumptions, in particular the bond strength between grout and surrounding soil, prior to the installation of working soil nails. As for soft landscaping, planter holes are provided on the shotcrete cover on the slope surface.
Scope of work
- Desk study, site investigation and stability assessment
- Design of 255 numbers of 3 to 11 m long soil nails and 4 numbers of 5 m long raking drains to upgrade the soil slope portion
- Design of 3 m high concrete buttresses to support overhanging blocks of the rock slope portion
- Construction supervision
- Preparation of maintenance manual
