全套管切削工法近年常被應用於拆除既有地下結構物，本研究選定一處採用大口徑全迴旋式全套管切削工法拆除地下連續壁與地下室底板之場址，針對切削地下結構、取出切除物與土壤、以及破除難以取出之切除物等作業所造成之地傳振動(ground-borne vibration)進行現地量測，並透過頻譜分析(spectral analysis)探討其振動量與頻率特性。切削作業多屬較低頻且具寬頻特性，主要顯著頻率位於6~8 Hz；重錘衝擊作業造成的振動量為整個拆除過程中最大者，可達約0.8 cm/s，垂直向主要顯著頻率在7.5~11 Hz區間，水平方向大多位於20~28 Hz的中高頻區段；抓斗夾取作業因拉扯角度與力道不一，所引致振動頻譜特性具隨機性而較無一致性；沖筒取土主要顯著頻率為3~4 Hz，振動量僅次於重錘衝擊作業。另外亦擇一採用油壓破碎機打除混凝土鋪面之場址進行施工振動量測，其在高頻區段振動量顯著，甚至超過前述重錘衝擊所造成者，且為相對窄頻之振動。進一步搭配常用之振動容許準則進行影響評估，分別為針對結構物完整性的USBM RI 8507與DIN 4150-3準則，以及針對精密儀器等振動敏感設施的VC準則。結果顯示，全套管切削拆除之振動均低於USBM RI 8507準則，唯重錘衝擊之垂直向振動值接近灰泥牆建材之臨界值；根據DIN 4150-3準則，僅重錘衝擊之垂直向振動值接近或略超過一般住宅建築物之容許值；另外就VC準則而言，前述振動於大部分頻段均超過VC-E，重錘衝擊與鋪面破碎在部分頻段甚至超過VC-A，對振動敏感設施可能有所干擾。綜合以上可知，雖全套管切削拆除工程中大部分作業之振動並不至於影響鄰近結構之完整性，但對敏感設施仍有潛在風險，相關研究成果可做為全套管切削施工振動影響評估與都會區既有地下結構拆除方式選擇之參考。

A construction site employing the large-diameter all-casing cutting method with a full slewing technique to demolish existing underground structures was selected. On-site measurements were conducted on the ground-borne vibrations generated during different operations of the demolition work. The vibrations were characterized through spectrum analysis. The cutting of structures featured low-frequency and broadband vibrations with predominant frequencies ranging from 6 to 8 Hz. The impact of drop hammer produced relatively high-frequency vibrations that had the highest magnitudes among all the demolition operations. The vibrations caused by removing the cut pieces using a grab exhibited random and inconsistent spectral content. Extraction soil by a cylinder caused vibration levels preceded only by the hammer impact with a predominant frequency of 3-4 Hz. The possible influence on the neighboring structures and vibration-sensitive facilities were then evaluated based on several commonly used vibration criteria. Only the vertical vibration levels induced by hammer impact approached or slightly exceeded permissible limits for the structural integrity of typical residential buildings. However, the vibrations of all operations may pose potential risks to nearby vibration-sensitive facilities. The findings of this study may serve as references for assessing the vibration impact of the all-casing cutting method and for selecting appropriate demolition techniques for existing underground structures in urban areas.

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