離岸風力發電為台灣未來急需發展的再生能源之一，而台灣西海岸為砂土與粉土堆積土層，且時常受到颱風、地震影響，眾多因素下對於基樁基礎選擇需審慎考慮。由於海床土壤樁土互制以及基樁載重傳遞機制複雜，發展一可控制土壤邊界應力之模型基樁側推試驗並量測樁土間互制反應對樁基礎研究具有相當價值。傳統基樁側向載重試驗多為現地基樁或室內縮尺固定邊界試驗，花費高昂、重複性低、與現地土層狀態仍有差異，本文介紹一應力控制邊界試驗平台，以原用於CPT之標度槽，轉換為可分層控制邊界應力、量測邊界應變並具可應用於飽和土壤試體，同時以霧式霣落法完成飽和粉土質細砂試體，利用基樁側推系統搭配模型基樁，以數值模擬計算不同側推位移時之邊界應力，以邊界應力補償方式降低邊界效應模擬現地半無限空間狀態，量測基樁受側推時樁土互制反應、不同有效應力狀態下土壤p-y行為，以提供發展不同飽和土層p-y曲線，協助離岸風電產業發展。

Wind power is one of the important renewable energy sources. Because of restrictions such as vibration and noise of land based wind turbines, offshore wind turbines are preferred options in Taiwan. Due to seismic, wind, wave and ocean current loadings and the thick layers of silty sand in the western seabed of Taiwan, pile foundations are considered more suitable for offshore wind turbine although lateral load transfer mechanism of pile is complicated for various soil conditions. This study develops a testing system that is capable of controlling boundary stress conditions of a model pile under pushover loading. A layered calibration chamber which was used for CPT is converted to a field stress simulator to mimic and compensated pressure conditions during pushover loadings. To prepare the saturated, silty sand specimen, mist pluviation (MP) technique is adopted. To reduce boundary effects during pushover tests, numerical analyses were performed to estimate the distribution boundary stresses and those values are used as boundary compensated pressures in calibration chamber. Strain gauges and tactile sensors for bending strain and interface stress measurement are attached to model pile and embedded in the calibration chamber. Lateral loads are applied on the pile top with different constrained conditions. With different consolidation pressure, apply normal and over consolidation condition to pushover tests. This thesis will provide verification data for p-y curves in saturated silty soils under different effective stress conditions.

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