Sonic logging for detecting the excavation disturbed and fracture zones

Yen-Ching Lin, Chiayi City, Taiwan, Young-Fo Chang, CCU National Chung Cheng University, Chiayi County, Taiwan, Jia-Wei Liu, Graduate Institute of Seismology National Chung Cheng University, Chiayi County, Taiwan and Cheng-Wei Tseng, Industrial Technology Research Institute, Hsinchu City, Taiwan