Simulation based on excavation of Shanghai M8 runnel Huaihai Road station used finite difference method to calculate and analyze the space and time effect of part divided excavating.

• (2)考虑轨道正上方土体分段开挖的时空综合效应,对土体的开挖应该在保证空间效应变化不大的情况下尽量缩短开挖及坑底暴露时间,有利于减少基坑变形及基坑下方隧道的纵向变形。