dc.description.abstract | Transportation is the foundation of the development. With the strong emphasis of the economic development, highway construction becomes the major engineering construction in this island. Over the past years, the Taiwan Government has spent major effort to build highways between the cities and rural farming areas and from coastline to the inland mountain region to stimulate the growth of nation’s economy and to increase the higher living standard and quality of living across the Island. Seeing the trend of the rest of the world and the gorgeous landscaping of the inland mountain region, the Government has put the major effort to build roadway system into the inland mountain region to promote the tourist industry. However, the government overlooked the power of the nature and the poor geological condition in the mountain, the rolling terrain, and the steep hills. With the torrential rain brought by the seasonal tyfengs and the earthquakes, especially the 921 Earthquake, the soil layer of the land became very loose and unstable, the disaster happens easily, especially, in the sloping hills, and causing the road damages and traffic closure.
Tao Yuan Rd #113 is the major road that connects Tao Yuan, Fu-Hsing Shiang and Shin Tzu, JianShih Shiang. The heavy rainfall brought by the Tyfeng Alice flooded the area, collapsed the roadway, and consequently the landslide, road caved in and the closure of the traffic. Our preliminary study has found that the vigorous geographic movement, the fragility of the soil structure, the heavy deposit of the weathered soil, the weakened coherence between soil and roadside rock layer have caused the damages. The excessive damages in this area also resulted from the lack of the soil conservation and drainage system when the highway was first built. In order to rebuild the damaged highway in the above mountain region, it is necessary to understand the causes, and the types of disaster.
The goal of this research is to study and develop a specific method to rebuild the local damaged roadway by using the combination of the technologies of Environmental and Conventional Structural Engineering. The study is thus designed based on the careful examination of concurrence of the functional, safety, economical factor, long-term, ecological and landscaping concerns, and according to the guideline published by the Legislature Yuan “Operation point of the After - Calamity Reconstruction Engineering Budget of the Public Facilities Deliberates”.
Our study has shown the high correlation between the mode of the destructions and the cause of the damages, and between the analysis of hydrology and geodetics. Therefore we recommend the following methods to restore the total damaged areas: stabilizing the embankment, enhancement of the drainage system, and plant vegetation along the roadside. In terms of other unstable and possible recurrent landslide embankment sites, we also recommend to take more flexible methods, such as, routine road maintenance service to tardy and lessen the flood damage; providing detour service to avoid major collapses. Finally, we recommend to install a system monitoring the changes of the ground water level, water pressure, and land sliding characteristics in various embankment sites, to provide information for future study, analysis, rebuilding and prevention, thus to minimize the human life and property losses. | en_US |