根据半无限大地基弹性沉陷公式 ,利用线粘弹性—弹性相应原理及Laplace变换等数学工具 ,导出了Kelvin型和三参量型粘弹性地基沉陷公式 .用空间八结点徐变等参单元离散上部结构 ,地基沉陷采用粘弹性理论解 ,提出了对软基上结构进行仿真计算的半解析计算方法 ,并编制了相应的计算程序 .实例计算表明 ,仿真算法能很好地模拟整个工程从开挖、施工到正常运行的全过程 According to the elastic subsidence formula of semi-infinite foundation, the formulas of viscoelastic settlement of Kelvin and three parameters are deduced by using the linear viscoelasticity-elasticity principle and Laplace transform. Structure and foundation settlement are solved by using the viscoelastic theory. A semi-analytical method is proposed to simulate the structure of the soft foundation, and a corresponding calculation program is compiled.Examples show that the simulation algorithm can well simulate the whole project from excavation , The whole process of construction to normal operation