Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

Abstract

The creep deformation of slopes in Woo-wan-chai landslide area has been a serious problem for District V, Directorate General of Highways, Taiwan, in maintenance of Province Road 18 since opening. With a 3-Km long section being laid across the area, the road is a main access to Alishan National Scenic Area and Yushan National Park in Taiwan. To closely observe the slope deformation, a long-term monitoring program was set up at the site. Results indicated the deformation was intimately related to the rainfall, ground-water rise, and slope toe erosion, with an average sliding rate reached about 20mm/month. Causes and mechanism of the slope creep-ing were further examined through several stages of field investigations and laboratory testing. Results indicated the geologic structure in the area was complicated by the faulting. Several potential sliding masses were identified with multi-layered deep-seated slip surfaces. The slope movements appeared to be the retrogressive-type. The short-term, residual and creep strengths of the sliding sur-face material were evaluated. Results indicated the creep strength of the material was about 85% of its short-term strength, which was roughly the required strength value of the slip surface material to maintain a marginal long-term stability of the slopes.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Sixth Conference

Publisher

Missouri University of Science and Technology

Publication Date

8-11-2008

Document Version

Final Version

Rights

© 2008 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Aug 11th, 12:00 AM Aug 16th, 12:00 AM

Investigation on Mechanism of Creep Deformation of Slopes in Woo-Wan-Chai Landslide Area, Taiwan

Arlington, Virginia

The creep deformation of slopes in Woo-wan-chai landslide area has been a serious problem for District V, Directorate General of Highways, Taiwan, in maintenance of Province Road 18 since opening. With a 3-Km long section being laid across the area, the road is a main access to Alishan National Scenic Area and Yushan National Park in Taiwan. To closely observe the slope deformation, a long-term monitoring program was set up at the site. Results indicated the deformation was intimately related to the rainfall, ground-water rise, and slope toe erosion, with an average sliding rate reached about 20mm/month. Causes and mechanism of the slope creep-ing were further examined through several stages of field investigations and laboratory testing. Results indicated the geologic structure in the area was complicated by the faulting. Several potential sliding masses were identified with multi-layered deep-seated slip surfaces. The slope movements appeared to be the retrogressive-type. The short-term, residual and creep strengths of the sliding sur-face material were evaluated. Results indicated the creep strength of the material was about 85% of its short-term strength, which was roughly the required strength value of the slip surface material to maintain a marginal long-term stability of the slopes.