| Summary: | 碩士 === 國立中興大學 === 土木工程學系所 === 105 === There are densely populated and land limited in Taiwan area. The land acquirement is getting more difficult with the rapid development of urbanization. More underground excavation engineering is widely carried out. The stability of retaining structure and the engineering properties of underground excavation adjacent to the retaining walls is worth studying further in order to provide the references of construction and design for relevant engineering agencies.
This study aims at the related mechanical behavior and engineering properties of underground excavation adjacent to the retaining walls with different distance between the retaining wall and excavation, different excavated depth and horizontal support using Plaxis 2D finite element program. From the analyzed results, it indicates that: (1). the maximum heaving quantity of final excavated surface is deeply affected by the excavated depth and irrelevant to the distance between the retaining wall and excavation and with or without horizontal support. (2). under the condition of 1m between the retaining wall and excavation and 3m of excavated depth, the horizontal displacement and moment of steel sheet pile without horizontal support are much greater than those with the installation of horizontal support, especially in the maximum horizontal displacement from 3.6mm increasing to 22mm. (3). under the condition of 3m of excavated depth, the maximum horizontal displacement, moment of steel sheet pile and axial force of the second layer of horizontal support are reduced in the rates of 46%, 38% and 64% respectively when the distance between the retaining wall and excavation is from 1m increasing to 5m. (4). under the condition of 5m between the retaining wall and excavation and 3m of excavated depth, the maximum axial force of horizontal support is only 9.2T compared with the pre-stressed force 10T and the condition of 5m between the retaining wall and excavation and 6m of excavated depth, the maximum axial force of the second layer of horizontal support is only 19.9T compared with the pre-stressed force 30T, those show the action of overstressing the horizontal support.
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