地震發生時，土壤液化為常見之地工災害，並可能因此造成地盤之側潰，對地下工程構造物如基礎等造成危害。本研究針對工程上常用之樁基礎，探討土壤液化所引致側潰作用對基樁之影響及基樁之抵抗性能。研究方法兼採數值分析與物理模型試驗，首先，回顧過去液化側潰引致基樁破壞之歷史案例與相關前人研究，採用SAP2000有限元素分析軟體，利用溫克基礎模式針對側潰對基樁造成之影響進行數值分析，藉此與實際情況與前人研究成果相互比較印證，並探討以不同加載模式模擬側潰作用時分析所得之基樁反應有何差異。另一方面，進行縮尺物理模型試驗，以剛性試驗箱容納地盤試體，透過注水系統使地盤達到之液化並側潰，觀察其對模型樁造成之影響，試驗過程中量測樁身應變、樁頭位移與樁身之變位，並基於梁理論分析樁身所受之彎矩、剪力、土壤反力等，發現模型樁受液化側潰作用時之行為與數值分析之結果相似，並展現出地盤不同位置之土壤反力特性差異。相關成果將有助於釐清基樁受液化側潰作用下之行為，合理掌握基樁之抗液化側潰性能，並可回饋至結構基礎之耐震設計，以減輕液化之危害。

Soil liquefaction is a common geotechnical disaster during earthquakes, which could lead to lateral spreading of the ground, causing damage to underground structures such as pile foundations. This study aimed to investigate the impact of liquefaction-induced lateral spreading on piles and their resistance performance using numerical analysis and scaled physical modeling. First, historical cases of pile failure cause by lateral spreading and the associated studies were reviewed. The SAP2000 finite element software was adopted for the numerical analysis of this case using the Winkler foundation method. The results are compared with the field observations and findings of the existing research to examine the differences in pile responses obtained by numerical analysis with various loading modes to simulate lateral spreading. Additionally, several scaled-model tests were performed using controlled seepage to induce liquefaction and lateral spreading of a ground specimen accommodated by a rigid box. During the tests, the strain and displacement of an embedded model pile was measured. The observed behavior of the model pile approximated that in the numerical analysis and also reveal the diverse characteristics of soil resistance at different depths. These findings contribute to the clarification of pile behavior under the influence of liquefaction-induced lateral spreading and a better understanding of the resistance performance of piles, which are beneficial for the seismic design of structural foundations. Thus, the hazards of soil liquefaction can be reduced.

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