The Elementary Research of Impact Echo Method for Detecting Diaphragm Walls

• Main Authors: Jan - Jer Lin, 林彰哲
• Other Authors: Ming - Te Liang
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/78552321051379838514

碩士 === 國立海洋大學 === 河海工程學系 === 83 === The impact echo method is a nondestructive technique using the principle of stress wave propagation in a solid. The crack， void and flaw in a solid can be fast detected through frequency spectrum analysis. The main purpose of this thesis is elementally to determine the correspondent position of diaphragms with crack，void and honeycomb in dry or saturated sand. From this study ，one can gets some important conclusions described as follows︰ 1.The flaw positions of concrete diaphragms can be accurately detected by impact echo method. 2.The steel near upper layer in concrete diaphragms can be determined，however，it is difficult to detect the steel in the deeper layer. 3.The impact echo method is not useful for predicting the vertical crack in concrete diaphragms.