PURPOSES: This study identifies the causes and the mechanism of the occurrence of underground cavities. METHODS: A case study on cave-in and a series of model tests with a small soil chamber were conducted. RESULTS: A hypothesis about the mechanism of the cave-in in road was established, and the basic influencing factors on underground cavity expansion were identified. CONCLUSIONS: It was found that the characteristics of shear strength of soil and direction of water flow had a larger influence on cavity formation and expansion than the characteristics of internal erosion. In addition, large cavities suddenly expanded when cavities were caused owing to breakage of buried sewer pipe.

1. 서론
 2. 사례분석을 통한 도로함몰의 기본적인 원인및 매커니즘 추론
 3. 도로함몰 특성 평가를 위한 모형토조 시험
  3.1. 모형토조 시험장치 및 시험절차
  3.2. 모형토조 예비실험 및 분석
 4. 결론 및 고찰
 REFERENCES

• 권기철(동의대학교 토목공학과 교수) | Kweon Gichul 교신저자
• 김상록(동의대학교 토목공학과 석사과정) | Kim Sanglok
• 홍석우(동의대학교 토목공학과 교수) | Hong Seokwoo