根据有效应力原理 ,分析了真空预压和堆载预压加固软基的基本原理。结合工程实例 ,对真空-堆载联合预压处理的公路路基表面沉降进行了现场试验观测和数值分析 ,认为真空 -堆载联合预压法适用于公路路基的加固处理。用平面应变Biot固结有限元分析 ,可得到令人较满意的结果 According to the principle of effective stress, the basic principles of vacuum preloading and preloading consolidation of soft foundation are analyzed. Combined with the engineering example, the field test observation and numerical analysis of the surface subsidence of the roadbed under vacuum-surcharge preloading are carried out. It is concluded that the vacuum-surcharge combined preloading method is suitable for the reinforcement of the roadbed. Using plane strain Biot consolidation finite element analysis, we can get more satisfactory results