Spatial and Temporal Distributions of Sliding Masses in Woo-Wan-Chai Landslide Area and Numerical simulation of Sliding Behavior

• Main Authors: Yu-Xin Zhang, 張佑新
• Other Authors: Muhsiung Chang
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/42851535942729958414

碩士 === 雲林科技大學 === 營建工程系碩士班 === 96 === Province Road 18 (i.e., Alishan Road) has been suffered frequent damages and slope failures during typhoon seasons or heavy rainfalls since the construction. The area of current study is located at the mileages between 43K+100 and 46K+800 ( new mileage numbering system) along the road. Due to zigzagging alignment, the area was named as Woo-Wan-Chai, which means five switch-backs in Chinese. National Yunlin University of Science and Technology (NYUST) has started a long-term monitoring program in Woo-Wan-Chai landslide area since year 2000. Prior to mitigation of the slopes, an understanding of the sliding mass distribution and their sliding behaviors in the area appears to be necessary. The study herein employed several ways in defining the boundaries of the sliding masses, which included the variation in topography (i.e., elevation, surface grading, etc.) with time, the result of inclinometer monitoring on the depth of sliding, and the result of site reconnaissance. Once the sliding mass distribution has been decided, the sliding behaviors of the masses were then investigated. By adopting the concept of block displacement and rotation, the spatial and temporal interactions among sliding masses could be examined. As for numerical analysis, the commercial software, FLAC, using finite difference method was employed for simulation of the behavior and the extent of in-situ sliding. Additionally, the creep module of the software was also utilized to verify the displacement-time relationship of the sliding masses. Results of numerical analysis were compared with those from the on-site monitoring, and the reasonability of adopted analysis parameters could therefore be checked. Numerical simulation provided a better picture on the process of slope sliding and the variation of stress and deformation in slope with time, which would help in the explanation of sliding mechanism of the slopes.