Soil Improvement for Offshore Wind Farm with Soft Soil( I )

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Project title

Code/計畫編號

MOST104-2622-E019-006-CC2

Translated Name/計畫中文名

離岸風場軟弱土層改良研究( I )

Project Coordinator/計畫主持人

Tai-Wen Hsu

Co-Investigator(s)/共同執行人

郭玉樹

Department/Unit

Department of Harbor and River Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=11473876

Year

2015

Start date/計畫起

01-06-2015

Expected Completion/計畫迄

31-05-2016

Bugetid/研究經費

1655千元

我國目前規劃之先導型彰濱離岸風場、福海離岸風場以及竹南海洋離岸風場，海床表層多為中等緊密至疏鬆之軟弱土壤，為提供足夠之基礎承載力，避免土壤液化造成基礎失穩，傳統設計概念皆為加大基礎尺寸或埋置深度。面對我國軟弱海床土壤，若離岸風機基礎設計尺寸超出我國鋼鐵製造產業生產能量，可能造成離岸風電產業過度倚賴進口，對我國產業及經濟發展並無助益。本產學合作計畫由科技部與國森企業有限公司支持，進行離岸風場軟弱海床土壤改良研究，規劃以快速凝結材ES搭配灌漿工法進行軟弱海床土壤改良，透過室內土壤力學試驗評估改良土壤基本物理性質及土壤剪力強度，結果顯示快速凝結改良材可大幅提升傳統地盤改良水泥漿材之凝聚力，可達到降低海床土壤液化潛勢、提升基礎承載力之目標。本計畫建議國森企業推廣快速凝結改良材搭配低壓灌漿之工法進行軟弱土壤地盤改良，以應用於離岸風機基礎設置及自昇式平台船站立施工。本計畫原為二年期計畫，但由於國森企業提出合作計畫中止申請，原規劃之現地土壤改良試驗僅完成試驗規劃，本計劃現有評估成果仍需後續現地實驗驗證，以確保工程實務應用性。 Geologically, the seabed of offshore wind farms in Taiwan mostly comprises modern alluvial layers formed by rivers and is composed mainly of sand mixed with miscellaneous clay. In the face of soft soil with high liquefaction potential, the size of foundations, the embedment depths or number of piles may increase to ensure the safety of offshore wind farms, however, these methods are limited by production capacities of the industries, and may also increase the cost of manufacturing and construction significantly. In this project, the surface soil improvement is proposed as an alternative method to reduce the seabed liquefaction potential and improve the lateral and scour resistance of the foundation. From the test results by soil mechanical laboratory tests and model tests, the soil hardening accelerator could greatly enhance the cohesion of traditional cement paste, and should be able to reduce the soil liquefaction potential, and increase the soil bearing capacity of the seabed. This project will assist Kuo Sen Enterprise Co., Ltd. in developing the soil improvement method in soft seabed soil for offshore wind farm, and enhance the development of offshore wind technologies in Taiwan.

Keyword(s)

離岸風場
海床土壤改良
模型試驗
現地試驗
offshore wind farm
seabed soil improvement
sandbox experiment
in-situ test

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Soil Improvement for Offshore Wind Farm with Soft Soil( I )

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