| Summary: | 碩士 === 中華大學 === 土木與工程資訊學系(所) === 94 === This study evaluates the optimum retaining structure system by investigating the soil characteristics and the useable lands along the slope of widening of the Tao-Chu Road #20, Taoyuan County, Taiwan. The evaluated factors include: cost, materials specification, availability of on-site materials, construction difficulty, inspection, risk potential, vegetation, environment & landscape, acceptability by residence, maintenance & management. Among the three different types of retaining structures, namely, reinforced soil wall, stone wall, and sandwiched wall, the above 10 factors are evaluated and the reinforced soil wall is considered the optimum ecological engineering method. Due to the elevation difference of more the 10 m, and the space constraint, the stone wall is unsuitable due to its stable high limitation of only 3m. Sandwiched wall is also unsuitable because of its big volume of rigid gravity wall, necessity of piling and uneconomic in cost. The reinforced soil wall, on the other hand, is flexible wall and the earth pressure could be reduced due to some allowable lateral deformation. Besides, it has several other advantages, such as high earthquake resistance, rapid construction, unnecessities of heavy construction equipments and very skillful workers, and the possibility of building very high wall, etc. Besides, since the geogrid has openings, spreading the weeds and cohesive soils will allow vegetation to grow. When the vegetation grows, not only green and beautiful, it also provides the nest for small animals and bugs to reside.
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