Case study of settlement of Hydraulic Reclamation Land

• Main Authors: Yei-Tar Chen, 陳穎達
• Other Authors: Lien-Weit Chien
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/09730054319143363541

碩士 === 國立臺灣海洋大學 === 河海工程學系 === 96 === Abstract Over the past two decades, due to speeding population increase causing the reduction of suitable land for industrial estate development in the inland and the influence of high environmental protection awareness of the public, it is an unavoidable trend to develop landfill on the coastal area for such purpose. However, landfill formed with dredging usually creates unstable and weak soil layer which is susceptible to settlement. The problems of settlement can be attributed to self-settlement of the sand and soil by its own weight, structure loading greater than the bearing capacity, original seabed settling due to overbearing of the landfill, and soil liquefaction subject to earthquake, which are in need of early solution. This study takes the landfill for N3~N4 Container Terminal at Taipei Harbor as a case study for appraisal of the settlement amount and to establish reference indicators for landfill elevations. The methods of this study are: (1) using representative bore holes data at the Container Terminal to calculate i) the settlement amount of the vertical inner stress of the soil layer due to container loads and ii) the self-settlement amounts for both the backfilled soil and improved (dynamically compacted) backfilled soil, and (2) assessing the soil liquefaction potential by applying the horizontal acceleration of earthquake of Amax=0.24g and Amax=0.308g. The settlement amount after liquefaction can be calculated by using bore holes data: i) of the soil layers after liquefaction, and ii) of the soil layers after liquefaction and soil improvement (by dynamically compaction). Because of the sensitivity of the automatic container handling facilities and related mechanical equipment to settlement, and the land settlement may render them to be unusable and out of function, there is very little allowance for land settlement at the container terminal, therefore, the accurate calculation of expected settlement amount is important for the landfill elevation of the container terminal. The main purpose of this study is by investigating the land settlement amount of landfill container terminal, to ensure the safety and reliability of the terminal facilities after the terminal is loaded with containers.