도시철도 인접지반 공동발생시 지하수위에 따른 노반 안정성 평가

Leakage of aged pipelines in urban areas have induced ground loss frequently resulting in cavities. Train loadings associated with change of groundwater levels in an undiscerning development of urban areas induce roadbed settlements. Since train derailment occurs as the roadbed exceeds the allowable settlements, location and size of cavity and groundwater level should be figured out. In this study, the commercial program, FLAC3D, which is a three-dimensional finite-difference numerical code is used to do stablity analysis of roadbed associated with groundwater levels and cavities in adjacent to urban railways. Numerical results show that the roadbed satisfies the allowable settlements as the center of roadbed is greater than 25-m distance from the center of cavity and groundwater level is lower than 22m below ground surface for 10-m diameter of cavity.