Jingwen He, Elise Jackson CEEn 544

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Presentation transcript:

Jingwen He, Elise Jackson CEEn 544 Po Shan Landslide 1972 Jingwen He, Elise Jackson CEEn 544

HongKong

Hilly Natural Terrain Land Reclamation Residential Areas

Po Shan Hillside Po Shan hillside is underlain by thick bouldery colluvium susceptible to development of high groundwater levels failure when disturbed by construction activities Steep terrain History of landslides during heavy rainfall

1972 Unusually high volume of rainfall Twice as the average rainfall for June. The 5th highest on the record

Geotechnical Study of Slide

Assumed FS of 1.5 along cut, but didn’t take into account the excessive rainfall.

Recommendations Regular inspections by engineers Construct water mains of non-brittle materials to avoid problems from differential settlement Drainage necessary on slope to prevent future disasters

Remediation Vertical Drain System Avoids problems from horizontal loads due to seismic forces Flexible barriers installed for shallow landslides