| Summary: | 碩士 === 國立臺灣海洋大學 === 河海工程學系 === 92 === Taiwan is restricted by the geographic condition at near shore area and request of national economy development. The site of the coastal structure has been become very difficultly to evaluate and to obtain the suitable land space to build. From the viewpoint of coastal geotechnical engineering practice, the soft ground of seabed has without enough bearing capacity or induced excessive settlement, and inclined to the structures damage etc. Therefore how to deep understand the mechanical behavior of soft marine silts will be one of the important investigations of the nearshore geotechnical engineering topic.
In this study, the related literatures and basic environment data were collected and analyzed to understand the properties of site regional state. From the microstructure analysis, the chemical composition construct of soft marine silts belong to the granite weathering and deposition. And the fabric network is described in terms of inter-aggregate and intra-aggregate porosity and will be obtained lower shear strength. On the other hand, jointed with the analysis of laboratory experiment and comparing with related research results and experience equations, the correctness of the test result is verified. And then, the test result feedback into the development of numerical simulation to make numerical analysis and to assure rationality and quality.
Based on linear-elasticity, Modified Cam-Ｃlay and consolidation theory, the model of settlement and stability was established. Finally, the mode results could be provided to estimate settlement and have deep finding out the real damage reason and mechanism of the “Matsu Harbor of Fu-ao region extend construction for breakwater”. It will conduct disaster prevention, stability under nearshore structure, and could be useful for the reference of the following repair engineering and estimate the settlement stability.
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