對於設計資料佚失之老舊結構物及歷史建物而言，由於早期的設計規範已不符目前使用需求，故提高老舊建物基礎基樁長度的檢測可靠度，以作為後續安全性評估之依據，已成為目前工程界的重要課題。
本文旨在探討平行震測法於受測體與測孔不平行時，測孔傾斜程度對檢測成果所造成的影響。
本文利用應力波射線理論推導出平行震測法測孔的傾斜修正式，並建立三維軸對稱有限元素模型，進行含測孔傾斜角度0-10度平行震測試驗之模擬。最後，再以現地預埋樁平行震測法檢測試驗及測孔傾斜檢測試驗成果，進行平行震測法測孔傾斜修正式的適用性探討工作。
根據數值模擬分析結果顯示，樁長預測誤差將會隨傾斜角度增加而增大，當採用本文所提出的平行震測法測孔傾斜修正式修正評估樁長後，樁長的預測誤差將會明顯減小，且使檢測成果趨於保守。此外，初始波抵達時間與深度曲線上部回歸線斜率通常可代表基樁的波傳速度，但若測孔並非完美地平行於受測基樁時，將此斜率視為基樁波傳速度將會是不合理的結果，經結合現地測孔的傾斜量測結果後，可將其視為評估受測體是否傾斜與斜樁設計是否存在的指標。
另由現地檢測試驗結果顯示，當測孔與地表面趨近於垂直時，現地試驗成果與數值模擬成果趨勢相符，採用Liao(2006)修正式與本文所提傾斜修正式的結果相近，皆使檢測成果趨於保守，有助於提升檢測成果之可靠度，同時也驗證本文所提測孔傾斜修正式應為Liao(2006)修正式之廣義修正式。

The loading capacity provided by pile foundations is largely dependent on their length. If the length of the foundations is not known accurately, necessary repair work might not be carried out. Unfortunately, the design information of old structures might be lost over time, and thus information about the foundation depth and geometry would be unavailable. To inspect the geometry of existing foundations become an important issue.
This study uses the ray theory to derive a correction factor for the PS test applied to pile foundations with an inclined borehole condition. Three-dimensional finite element studies using axisymmetric models were performed to show the influence of an inclined borehole on the pile length prediction. In this study, a borehole inclination factor is proposed in this paper to enhance the accuracy of the parallel seismic method for pile length assessment when a borehole is not drilled perfectly parallel with the tested foundation. Three dimensional axisymmetric finite element models were performed to show the effects of the inclined angles of the borehole. The results from the numerical models show that the estimated error of the pile lengths increases with the increasing inclined angles, and can be reduced to less than 5% when the derived inclination factor is considered. In addition, the slope of the top fitted straight line in the first arrival time versus depth plot does not represent the true P-wave velocity of the tested structure if the borehole is not perfectly parallel with the pile foundation and use of this value to determine the quality of the tested pile foundation would be unsuitable. However, this unreasonable value of the P-wave velocity of the tested pile can be used as a guide, representing the inclination of the borehole.
The results from the situ tests are similar to the results from the numerical models when the borehole is almost vertical to the surface. At the same time the results from Liao’s correction are also the same as the results from inclination correction. There are all conservative to assess the reliability of old structures and good to improve the precision of the PS situ tests.

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