| Summary: | 碩士 === 國立高雄應用科技大學 === 土木工程與防災科技研究所 === 102 === It is often to see that MRT system is located in crowed urban area. Therefore, deep excavations are commonly delivered in the corridor area next to MRT system. However, due to limitation in space, it generally leads to the difficulty of construction and may even become worse to cause damage of adjacent structures.
In this study, three cases located in protection and safety zone of Kaohsiung MRT system are selected for research background for further study. Key conclusions of this study include: (1) shape of lateral displacement of retaining wall behaves in cantilever mode from the beginning to the end and this may be connected with use of buttress or cross- wall; (2) excessive deformation induced may be linked to poor quality of diaphragm wall as well as faster pumping at the site; (3) Once buttress and cross- wall constructed by poor quality of hydraulic grab method, the effectiveness of said protection measure become significantly less; (4) Installation of high- quality cross- wall or buttress can reduce the deformation. However, a big difference is seen for impact from cross- wall or buttress once the distance to these measures is different; (5) Except very large displacement occurs, strain induced by stress relief of tunnel excavation is generally less than 0.5%. In addition, very limited number of instruments installed inside the tunnel next to excavation, it is thus difficult to explore further for induced behavior or damage of tunnel caused by the excavation. Therefore, it is suggested to select certain areas to install related instruments to collect useful data for further evaluation.
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