Liu Liu & Zhenming Shi 
Detection of Karst Voids at Deep Pile Foundation [PDF ebook] 

Introduction.- Overall strategy.- Borehole Sonic Detection Equipment.- Borehole Sonic Detection Analysis Method.- Inversion of Borehole Sonic Detection.- Borehole radar detection method.- Pile hole sonar detection equipment.- Pile hole sonar detection analysis method.- Advanced Pile hole sonar detection system.- Complete application.- Conclusion and further research suggestion.

Liu Liu, Associate Researcher at the Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, holds a Ph.D. in Engineering from Tongji University and is a visiting scholar at the University of Kansas. He is primarily engaged in research on geophysical exploration and non-destructive testing of rock engineering. He has been selected for the 8th Young Talents Program of the China Association for Science and Technology and the Wuhan Talents Program. He has also led projects such as the National Natural Science Foundation’s Youth Project. Liu has received various awards, including the Gold Prize in the High-Value Patent Competition of Hubei Province, the Excellent Doctoral Dissertation Award from the China Highway And Transportation Society, the First Prize for Technological Invention in Shanghai, the First Prize for Scientific and Technological Progress in Hubei Province. His achievements in karst detection technology for pile foundations have been industrialized. As of 2024, over 250 sets of pile foundation karst detection equipment have been applied in China, receiving recommendations of standard in karst areas such as Guangxi and Guizhou province.
Fengjuan Tao, Ph.D. in Geological Engineering from Tongji University, conducted joint research in Geotechnical Engineering at the University of Kansas. Her work focuses on ground improvement and underground engineering. She has published over 10 papers, including 3 in international journals like Acta Geotechnica and International Journal of Geomechanics, and has presented at multiple international conferences. She received two international academic awards, including recognition at Geo-Congress 2021, as well as five provincial and ministerial-level awards, including the Gold Award for High-Value Invention Patents in Hubei Province.