摘要

於地震頻繁的台灣地區，建物基礎等各種土木工程均需考量耐震設計，無論是基礎或是建物本身，各種相關的動態特性都是重要考量之一，原先用於評估道路舖面系統狀況的表面波譜法，即是提供大地方面土層相關動態參數的方法之一。
在各種求取土層動態參數的方法中，實驗室方法有著取樣擾動、解壓等不可抗拒誤差，於其他現地方法中則有耗時較久、施作較複雜的缺點，是以本研究即以表面波譜法為目標，研究表面波譜法運用於反算土層剪力波速時，可能遭遇的問題與誤差。
根據本研究結果顯示，於探測深度方面，較大接收器間距與較簡單的頻散點位分佈，探測深度會比較大；於近似反算結果方面，Satoh近似反算之剪力波速與實際土層資料的剪力波速，大致上的誤差落於5%到30%之間，對於土層剪力波速漸變方面，Satoh近似法能清楚表現波速隨深度漸增而不能表現波速隨深度漸減的情況；於求取平均頻散曲線的各種平均法方面，國外研究建議之半對數區間法、延伸趨勢法以及一般常見的迴歸曲線法，對於複合曲線反折的現象均有過度簡化或平均效果不佳的狀況產生，必須使用本文建議之改良式延伸趨勢法才會有較佳的效果，然而對於一般頻散曲線狀況，使用迴歸曲線法仍較為簡便與快速。

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