台灣目前所仰賴的能源主要來自於非再生能源，為保護環境以達永續發展，故研發再生能源之發電技術是現今的主要目標，離岸風電即為目標之一。樁基礎為離岸風機常採用的基礎型式，其受側向載重的行為是設計時主要控制的因素，而離岸風機之基樁常年會受到風、波流造成的側向反覆載重，且因台灣西海岸為軟弱的粉質砂土層，又時常受到颱風、地震的侵襲，造成基樁側向載重傳遞機制複雜。本研究利用一可控制土壤邊界應力與應變之模型基樁測試平台，用以模擬現地土壤的應力狀態，其為原用於CPT標定之標度槽修改而成，利用標度槽可控制邊界條件之特性，試體壓密時可利用邊界應變控制維持Ko狀態，而在側向加載過程中可施加數值模擬之邊界補償應力以模擬半無限域狀態，進而降低邊界效應的影響。本研究利用霧式霣落法製作飽和均質的大型粉質砂土試體，以模型基樁測試平台模擬不同邊界條件，進行長樁模型的側推(push-over)與側向反覆加載(cyclic lateral loading)試驗，以現地縮尺模型試驗探討在不同邊界條件下靜態(static)與循環(cyclic)加載之樁土互制反應其差異性，協助台灣離岸風電的發展。

Electricity supply in Taiwan is mainly depending on non-renewable energy. To protect our environment for the purpose of sustainable development, research and develop renewable energy power generation technology is an important goal in nowadays. Offshore wind power technology is exactly one of it. Pile foundation is often used in offshore wind turbine. The main control in designing it is responses of lateral loading on the pile. Offshore wind turbine will be loaded repeatedly by winds and waves in lateral direction for a long time. Furthermore, soil in western seabed of Taiwan consists of weak silty sand and frequently hit by typhoons and earthquakes, which make lateral loading transfer mechanism in pile foundation complicate. We used a pile foundation model testing platform which can control the boundary stress and strain condition of the soil to simulate the in-situ stress condition of the soil. It was modified from the calibration chamber which is originally used on CPT tests. Taking advantage of the characteristic that the calibration chamber can control boundary conditions, we can maintain the specimen in Ko condition by controlling boundary strain during consolidation and provide boundary compensation stress during lateral loading, which are captured from numerical simulation, to simulate the semi-infinite domain situation for the purpose of reducing boundary effects. This study used mist pluviation to prepare a large, homogeneous, saturated silty sand specimen and the pile foundation model testing platform to simulate different boundary conditions, testing push-over and cyclic lateral loading on the long pile model. Discuss the difference of soil-pile interaction response from static and cyclic loading in different boundary conditions by the in-situ scale model in order to assist the development of Taiwan’s offshore wind power technology.

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