| Summary: | 碩士 === 國立中興大學 === 土木工程學系 === 88 === Constructing or renewing service pipelines is one of the major construction works during development of an urban area. Traditional trench excavating method has advantages, such as easy working and low cost, etc., however, it has large impact on not only the environment but also the traffic. Also, it does not suitable for the conditions with permanent surface facilities. Therefore, trenchless construction methods were developed and applied to avoid those difficulties. The surface formations of Taichung area, besides a 5 meter thick soil, consists of a gravel formations thicker than 50 meters. As the quartz-sandstone gravel is very hard and difficult to break, the most common excavation methods are non-mechanical and semi-mechanical methods. In recent years, due to the rapid development of the city, there are more and more trenchless pipejacking constructions. The objective of the study is focused on the pipejacking construction in gravel formations. The finite element software ABAQUS was used to simulate the behavior of underground excavation in the gravel formations.
In the three-dimensional pipejacking simulation, the extended Drucker-Prager models are adopted. We analyzed the behavior of the gravel formations in the process of pipejacking construction and compare the numerical results with the in-situ subsidence surveying results.
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