ASTM D4633-86中規定計算鑽桿能量的力量歷時積分法，係基於鑽桿為均勻斷面之假設，然而鑽桿與接頭之斷面積並不相同，因而此假設條件並不符合實際狀況。本研究之目的為探討接頭對於SPT打擊能量影響，進而考慮力量歷時積分法法的接頭修正。研究方法首先於實驗室進行打擊試驗，在總桿長固定為3m下設計不同的接頭佈設方式，以進行不同接頭數目之能量檢測，採用之方法為荷重計量測法。試驗結果顯示接頭反射壓力波造成力量歷時曲線上昇，且延長張力截斷時間，因而使得力量歷時積分法法計算所得鑽桿能量增大。
為了進行力量歷時積分法法的接頭修正，本研究透過數值分析，探討接頭隨桿長增加情況下對於打擊能量影響，分別模擬無接頭鑽桿與有接頭鑽桿，經由比對二者之鑽桿能量，建立考慮接頭之桿長修正係數。結論指出，ASTM D4633中桿長修正係數考慮接頭影響時可參考本文提出之修正式，當桿長超過15m，長度對於打擊能量影響即不再增加，修正係數可採用0.97。

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