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題名 | Study on Measuring Settlement by Magnetic Method at any Depth=以磁氣式法測定各深度沈陷之研究 |
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作者 | 柯武德; Ko, Wu-te; |
期刊 | 正修學報 |
出版日期 | 20001200 |
卷期 | 13 2000.12[民89.12] |
頁次 | 頁33-49 |
分類號 | 441.103 |
語文 | eng |
關鍵詞 | 沈陷; 磁氣式法; 沖積層; 洪積層; Settlement; Magnetic method; Alluvium; Diluvium; |
中文摘要 | 近年來許多臨海地區建設海蒲新生地,一般沿海地區的海底地盤是由第三紀層、洪積層、沖積層這三層的順序堆積而成。這種自然地盤再加上填土載重所造成的壓密沈陷,只局限於沖積層。但是,如果超過相當厚度之填土荷重加在自然地盤的話,沖積層及洪積層均會有壓密沈陷發生。所以,為了詳細研究多層地盤的沈陷現象,不單只測定地表面之沈陷量,且必需測量各層及各深度之沈陷量才能分析壓縮、壓密等現象。 本文研究的目的在介紹本人在日本研究多年且被一般工程界接受、成效良好之工法研究。而其方法是利用鑽探孔,在其孔內各土層打入永久性磁鐵片,再以磁氣感應裝置測定各土層之沈陷量,以利探討各層、各深度的沈陷量特性。 |
英文摘要 | When artificial islands are constructed, they are subject to surface subsidence, which is the resultant sum of the consolidation strata, many of which seem differ in character. When these strata are soft and thick, or heavily loaded, it becomes very difficult to estimate how much settlement will eventually take place, and over how long a period. For the estimate to be accurate, the settlement characteristics of each layer must first be determined. For this purpose, the authors have investigated a new method of measuring settlement, based on two unique principles. One principle is the application of a permanent magnet as an indicator of settlement, and the other is the exploitation of semiconductor, magneto-resistance elements for detecting the magnetic fields. In advance of the observation, the magnets are forced into the earth, being pushed out through the bore-hole casing by the oil jack at suitable depths and intervals. The small-sized magneto-resistance element is essential to the practicality and efficiency of this method. In this study, the principles of this method, measuring procedure, the special characteristics and potential of this system, and the results of field trials are described. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。