標準貫入試驗與能量檢測

Standard Penetration Test and Energy Transfer Measurement

蔡錦松(Jiin-Song Tsai) ； 劉衍志(Yean-Jhe Liou) ； 周立德(Lee-Der Jou) ； 劉福鎮(Fu-Chen Liu)

《地工技術》 83期 (2001/02) Pp. 27-38

https://doi.org/10.30140/SG.200102.0002

摘要

本文闡述目前常用標準貫入試驗之能量檢測方式以及相關研究成果。說明工程品質觀念下，對於標準貫入試驗成果驗收過程要求，促成近日對於打擊能量檢測十分重視。文章除了解釋整個打擊過程能量傳遞階段及不同階段相應之能量檢測方式以外，更刻意比較現行ASTM規範中能量分析所採用之「力量歷時積分法」，以及該規範未來修改時可能增補的「力量－速度積分法」。對於世界上大多數規範疏於講究的落錘與鉆板型式，則藉由實驗室標定檢測，深入探討三種不同尺寸之圓柱形落錘以及一個安全式落錘對打擊能量之影響。試驗結果說明，在相同操作（自由落錘）條件下，落錘型式（形狀）影響打擊能量並不明顯。同時，研究結論建議改良以往一般採用之「平頂式鉆板」成為「圓頂式鉆板」，可以大幅改善原本變動極大的能量輸入，獲得非常穩定的打擊能量。

關鍵字

標準貫入試驗 ； 打擊能量檢測 ； 自由落錘 ； 圓頂式鉆板

並列摘要

This paper describes the researches concerning the commonly used energy transfer measurement methods for standard penetration tests. Problems of the SPT energy transfer were once of less care, and the recently growing needs on quality assurance of construction works have called more attention. A SPT energy transfer route can be subdivided into stages, and energy measurement corresponding to different stages are delineated in respect to some available methods. In order to explain the computation of measured energy, a comparison is made between the force square integration method of the current ASTM code and the force-velocity integration method of the future ASTM reviewing. A study is presented to analyze the influence of hammer shape using the calibration testing in the laboratory. Testing results of three different cylindrical hammers and a safety hammer indicate that the influence of hammer to the energy transfer is of insignificance providing the hammer drops in free-fall case. Based on the laboratory results, the paper recommends a round-headed anvil to replace the currently adopted flat-headed anvil in SPT tests to improve the energy transfer process.

並列關鍵字

Standard penetration test ； energy transfer measurement ； free-fall hammer ； round-headed anvil