On this study, the laboratory model test is a soil tanker to be contained with clay and grid form improved soil, the test model is conducted in total 9case with the uniaxial compressive strength of improved soil and replacement ratio of improved soil. Numerical analysis for variation of stress distribution ratio with depth is performed in the same conditions which are the laboratory model test. As a result, stress distribution ratios in mid and high replacement ratio are increasing and settlement is decreasing, except low replacement ratio.
This study is presented for form effect ratio and settlement reduction factor with change of structure form, it is able to be helpful in further research and reference for change of structural forms at composite ground.

• 이송(서울시립대학교 토목공학과 정교수, 공학박사) | Lee, Song
• 박경한(서울시립대학교 토목공학과, 박사과정) | Park, Kyung Han
• 구본수(서울시립대학교 토목공학과, 석사과정) | Goo, Bon Soo
• 장기수(한국시설안전공단 국가녹색건축사업센터 차장, 공학박사) | Jang, Gi Soo