Limestone zone in korea have been distributed to diagonal line so that it is wide from the Gangwondo to the Jeonlanamdo. The limestone cavity and fractureed zone is formed by chemical weathering. Limestone cavity and fractured zone was reinforced by high pressure jet grouting to establish bearing capacityon the ground condition like limestone cavity. But it are defective that the essential criteria of design, construction and quality control. The injection grouting method has therefore many difficulty which it is applied in such a limestone cavity.

• 김낙영(한국도로공사 수석연구원, 공학박사) | Kim, Nag Young 교신저자
• 박진희(한국도로공사 삼척속초건설사업단, 과장) | Park, Jin Hee
• 박균서(한국도로공사 삼척속초건설사업단, 과장) | Park, Kyun Seo