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標題: The evaluation of slope stability and improvement method on steep gravel slope and pits--A case study of Kweishan village in the Taoyuan county
作者: 童秉紳
Tung, Ping Shen
關鍵字: gravel extraction;砂石;slope stability;gravel layer;邊坡穩定;卵礫石層
出版社: 水土保持學系

This study is mainly focusing on the five large scale manmade excavation pits in the region of Tarliao and Longhwa of Kweishan village in the north of Taoyuan county. In this study, numerical tool was adopted to analysis the stability of the slope, and a series of suitable countermeasures are worked out to solve the problems existing in the field site. Among the various solutions, we try to find out the most economic, efficient and feasible treatment method. Finally, the SWOT analysis is used to analyze the environmental protection actions in promoting community development, and offer the tactical suggestions.
The slope analysis for these manmade excavation pits with the heights from 50m to 100m is summarized below:
1.To find out the most likely sliding face matching with the current and historical form of the slope.
2.To study the influence of soil factor C、ψ for gravel and inter-layered rock by using simulation method.
3.Based on the 921 earthquake, the horizontal acceleration factor Kh=0.08, and several countermeasure method were used to simulate the soil factor. The results show that the actual soil factor is higher than the references.
Safety is the major concern for the treatment of the pits. Unless there is immediately danger for house and traffic in the vicinity, the local government will be forced to treat the problems. Otherwise fence or warning poster can be set up at the initial stage to keep people away the pits. Fill and level up the pits by slope cutting or filling up method is the ultimate countermeasure for safety consideration.
The profits of the filled up of the pits cover several fees(regulation fee of abandon soil, transportation, etc). Further analysis shows that the filled up process might not be beneficial, so unless it’s highly dangerous and the landowner refuse to take the responsibility, government should forced the landowner to solve the problem.
All the five pits has stabilized after the 921 earthquake, Typhoon Hurb and Nali. But the local citizens strongly protest the gravel extraction, which kept all the legal extraction proposal still on paper only.
The pits can be used as the abandon area for sludge from the dam, which will need further study about its soil texture, the monitoring process, transportation fee, economic feasibility.
To control the illegal excavation and filled up of the pits, government should higher the fine based on the actual quantity of excavation. In the future, we shall revise the law of region planning, higher the limit of the fine, using the market price and the actual quantity of excavation as the base for the fine.
Appears in Collections:水土保持學系

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