A Study of Ground Improvement Techniques of Pre-loading with Prefabricated Vertical Drains Construction Method—Illustrated by the Land Reclamation Project at Warehousing and Logistic Area in Taipei Port

• Main Authors: Chen, Te-Lung, 陳德隆
• Other Authors: jing, Jong Jang
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/9e36m4

碩士 === 國立臺灣海洋大學 === 河海工程學系 === 106 === Abstract This study investigates the process construction, removal of construction obstacles and the inspection of land subsidence in the land reclamation project at Warehousing and Logistic Area in Taipei Port. Taipei Port was built in 1993. The first phase of land reclamation construction was meant to solve the problem of lack of land storage, and the storage land was built by 10,730,000 m3 waste soil into a 43-ha reclamation. Different from most cases in the western Taiwan being reclaimed on sedimentary rock, the composition of the reclamation in this case was rather more complicated. Therefore, the SPT-N level ranged from 1 to more than 100, and its moisture content was up to 51%, which was a rare pre-loading with prefabricated vertical drains construction case in Taiwan. This case study entails the techniques of pre-loading with prefabricated vertical drains construction method. The method utilizes pre-loaded soil to enhance the soil stress. The dead load would thus stimulate the saturated and weak clay deposit to enhance the excess pore water pressure and succeed in the effect of preloading. Prefabricated vertical drains are, therefore, employed to enlarge the drain path of pore water or shorten drain distance. In so doing, the preloading time will be shortened and the soil resistivity will be strengthened to achieve the expected amount of consolidated settlement. The results showed that the properties and nature condition of soil would affect the construction of drains relatively. The geographical location, weather, nature environmental factor and timing of construction would all be possible factors influencing the rather low rate of work in building draining system. The results of practical experiment showed a subsidence value close to the theoretical one, which could be evidence that draining system will be functioning and could compress the construction time. Key words：Rec1aimed land, Excess Pore Water Pressure, Prefabricated Vertical Drain, Preconsolidation Load, Consolidation Settlement.