对表面沉降、分层沉降、水平位移的特征做了详细分析 ,并将真空—堆载联合预压法与堆载预压法相比较 ,从而得出了一些真空—堆载联合预压下地基变形特性 ,简要介绍了软土层厚度、加固过程中的密封、真空度在加固过程中的稳定性、加固区形状、荷载大小、垂直排水通道等对地基变形的影响 The characteristics of surface subsidence, stratification and settlement and horizontal displacement are analyzed in detail, and the combination of vacuum preloading and preloading is compared with that of preloading. The deformation of subsoil under vacuum-surcharge combined preloading is obtained Characteristics, the thickness of soft soil layer, the seal in the process of reinforcement, the stability of the degree of vacuum in the process of reinforcement, the shape of the reinforcement zone, the size of the load, the vertical drainage channels and so on are briefly introduced