This study is to determine the predictability of the ground cavitation by GPR equipment. Water and sewage pipeline buried in sand and soil tanks and to prepare a specimen for exploration of water and air cavities. The sand for a dielectric constant 8, the soil using 6.5 is preferred to extract data for the asphalt pavement condition. After the GPR detections, the cavity in sand tank rather than soil tank is to obtain more precise data.

• 이현호(동양대학교 건축소방행정학과 교수, 공학박사) | Lee, Hyun Ho
• 이은진((주)동양구조이앤알 부설 기술연구소 소장, 공학박사) | Lee, Eun Jin
• 현창국((주)동양구조이앤알 대표이사, 공학석사) | Hyoun, Chang Kook