Location
Arlington, Virginia
Date
14 Aug 2008, 4:30pm - 6:00pm
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
Meeting Name
6th Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2008 Missouri University of Science and Technology, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Chang, M.; Chiang, G. M.; Chen, S. D.; Zhang, Y. S.; Liu, H. C.; and Wu, C. F., "Investigation on Mechanism of Creep Deformation of Slopes in Woo-Wan-Chai Landslide Area, Taiwan" (2008). International Conference on Case Histories in Geotechnical Engineering. 30.
https://scholarsmine.mst.edu/icchge/6icchge/session02/30
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.
