A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Landslide processes and landslide susceptibility analysis from an upland watershed: A case study from St. Andrew, Jamaica, West Indies
Abstract Rainfall-induced landslides are common geomorphic events on the steeper slopes of Upper St. Andrew and cause severe environmental, engineering, social and economic repercussions in the area. A geotechnical study was initiated to identify (a) past, present and potential landslide types and sites for landslides; (b) to examine the nature of geological, geomorphological and geotechnical conditions under which failures can take place and (c) the potential landslide hazard in the area. 886 failures were mapped, more than 80% of which were located in soils. A total of 1.55 km2 (9.80% of the total area) had failed. Approximately 59 failures per km2 were mapped, with the highest density within elastic sedimentary units and weathered granodiorite. 789 failure were mapped on slopes between 20°–45°, with no failure on slope less than 10°. 481 failures were mapped along twelve major roadways (46.6 km of road), with approximately 10 failures/km of road. Analysis of eighteen geotechnical units within nine geological formations revealed that the highest susceptibility for failure was within Old Landslide Deposits, with granular nonplastic to low plasticity soils, and on slopes between 20° and 30°. The lowest susceptibility was found within White Limestones and Recent Alluvium and Terrace Deposits. Granular, nonplastic to low plasticity soils are generally more susceptible than fine soils, especially on slopes between 30° and 45°, while granular and expansive clay soils demonstrate similar susceptibilities, but on slopes between 30° and 45° and 20° and 45°, respectively. Clastic sedimentary rocks are more susceptible that igneous lithologies. An increase in slope angle increases the susceptibility to failures, but only on slopes up to 45°. An increase in the degree of weathering of soils and bedrock and fracturing of bedrock, as well as road construction increases the landslide susceptibility in the area.
Landslide processes and landslide susceptibility analysis from an upland watershed: A case study from St. Andrew, Jamaica, West Indies
Abstract Rainfall-induced landslides are common geomorphic events on the steeper slopes of Upper St. Andrew and cause severe environmental, engineering, social and economic repercussions in the area. A geotechnical study was initiated to identify (a) past, present and potential landslide types and sites for landslides; (b) to examine the nature of geological, geomorphological and geotechnical conditions under which failures can take place and (c) the potential landslide hazard in the area. 886 failures were mapped, more than 80% of which were located in soils. A total of 1.55 km2 (9.80% of the total area) had failed. Approximately 59 failures per km2 were mapped, with the highest density within elastic sedimentary units and weathered granodiorite. 789 failure were mapped on slopes between 20°–45°, with no failure on slope less than 10°. 481 failures were mapped along twelve major roadways (46.6 km of road), with approximately 10 failures/km of road. Analysis of eighteen geotechnical units within nine geological formations revealed that the highest susceptibility for failure was within Old Landslide Deposits, with granular nonplastic to low plasticity soils, and on slopes between 20° and 30°. The lowest susceptibility was found within White Limestones and Recent Alluvium and Terrace Deposits. Granular, nonplastic to low plasticity soils are generally more susceptible than fine soils, especially on slopes between 30° and 45°, while granular and expansive clay soils demonstrate similar susceptibilities, but on slopes between 30° and 45° and 20° and 45°, respectively. Clastic sedimentary rocks are more susceptible that igneous lithologies. An increase in slope angle increases the susceptibility to failures, but only on slopes up to 45°. An increase in the degree of weathering of soils and bedrock and fracturing of bedrock, as well as road construction increases the landslide susceptibility in the area.
Landslide processes and landslide susceptibility analysis from an upland watershed: A case study from St. Andrew, Jamaica, West Indies
Maharaj, Russell J. (author)
Engineering Geology ; 34 ; 53-79
1993-02-04
27 pages
Article (Journal)
Electronic Resource
English
Landslide processes and landslide susceptibility analysis from an upland watershed
| British Library Online Contents | 1993
Landslide processes and characteristics from south-eastern Jamaica, West Indies
| British Library Conference Proceedings | 1996
The draining of Matthieu landslide-dam lake, Dominica, West Indies
| British Library Online Contents | 2012
| British Library Conference Proceedings | 2007