竹南砂模型側向樁p－y曲線之研究－Reese與API模型之驗證

p-y CURVES OF MODEL PILE IN ZHUNAN SAND - VERIFICATION OF REESE AND API MODEL

徐雅涵(Ya-Han Hsu) ； 徐煜淳(Yu-Chum Hsu) ； 陳冠羽(Kuan-Yu Chen) ； 楊鈞翔(Chun-Hsiang Yang) ； 黃俊鴻(Jin-Hung Hwang)

《中國土木水利工程學刊》 30卷4期 (2018/12) Pp. 263-273

https://doi.org/10.6652/JoCICHE.201812_30(4).0003

摘要

為瞭解離岸風機基礎於台灣西部風場地層側向受力之行為，本研究選用鄰近苗栗海洋示範風場之竹南砂製作模型地盤並設計模型基樁試驗，以靜態極限側推試驗結果對側向樁承載行為進行分析與討論。本研究使用三種相對密度之乾砂與飽和砂試體進行12組試驗，並利用迴歸分析與彈性梁理論建立竹南砂之p－y曲線。試驗結果顯示Reese模型與API模型皆有高估初始勁度之現象，在深度小於三倍樁徑時，亦皆有低估強度之現象。比較p－y曲線之發展，Reese模型與試驗結果之非線性行為較為接近，而API模型除有高估初始勁度之現象外，其曲線與完全彈塑性模型較為相似。

關鍵字

模型樁 ； 側向載重試驗 ； p-y曲線 ； 水平地盤反力係數

並列摘要

A series of lateral model pile test was conducted in this study to find out the behavior of pile foundation for offshore wind turbine under lateral loading. The test specimens including dry sand specimens and saturated specimens were prepared by Zhunan sand, which was the coast sand of western Taiwan. After doing the lateral loading tests, the moments along the model pile measured during test were used to develop the p-y curves by regression analysis and the elastic beam theory. Comparing the p-y curves with Reese model and API model, the strength of the p-y curves were underestimated by Reese model and API model when the depth was less than 3 times the diameter of the model pile. The initial stiffness of the p-y curves were overestimated by the two models for all depths. The non-linear relation of Reese model was similar to the p-y curve of the test results. Different from the Reese model, the non-linear relation of API model was similar to elastic-perfectly plastic model, and the initial stiffness was overestimated.

並列關鍵字

model pile ； lateral loading test ； p-y curve ； coefficient of horizontal subgrade reaction