- 學位論文
地下結構承受大地應力產生之應力分布探討
Discussion on Stress Distribution Caused by Underground Structure Bearing Geostress
摘要
現今地下化的工程廣泛的被使用，而臺灣的地質環境多斷層且分布全臺，使得這類地下化工程可能因大地應力作用產生的應力集中現象，導致地下結構物的變形。而分析時，因現地工程數據如：地層、地質以及地形等，使得問題較難以解析解處理，需要藉由軟體輔助處理實際工程情況。本研究使用ANSYS Workbench有限元素分析軟體來做為現地工程的參考依據。 通過邊界設定以及分析功能的設置，探討含孔洞土體受張力作用下的應力分布及變化，並藉由網格切割出重點分析之處，以增加計算結果精度，並減少計算時長。 首先，探討分析在ANSYS Workbench中所呈現的計算結果是否與解析解相吻合。於後續分析中討論各種形式的孔洞於不同環境下所產生之數值結果，研究結果證明配合有限元素分析軟體可有效且快速的凸顯應力集中分布，有助於對於日後於斷層旁的地下工程給予了一個參考依據。
並列摘要
Today's underground projects are widely used, and Taiwan's geological environment has many faults and is distributed throughout Taiwan, so this type of underground project may be caused by the stress concentration phenomenon caused by the action of the earth's stress, resulting in deformation of underground structures. During the analysis, due to the on-site engineering data such as stratum, geology, and topography, it is more difficult to analyze and solve the problem, and it is necessary to use software to assist in processing the actual engineering situation. This study uses ANSYS Workbench finite element analysis software as a reference for site engineering. Through boundary setting and analysis function setting, the stress distribution and change of the soil with holes under the action of tension are discussed, and the key points of analysis are cut out by meshing, so as to increase the accuracy of calculation results and reduce the calculation time. First, it is discussed whether the calculation results presented in ANSYS Workbench agree with the analytical solution. In the follow-up analysis, the numerical results of various types of holes in different environments are discussed. The research results prove that the combination of finite element analysis software can effectively and quickly highlight the distribution of stress concentration, which is helpful for future underground engineering next to the fault. a reference.