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文章以杭(杭州)浦(上海浦东)高速公路第七合同段为工程背景,针对真空—堆载联合预压加固地基强度增长的特点,分别采用有效应力法和有效固结压力法分析了由于剪切蠕动所导致的抗剪强度衰减。通过对比加固前后的抗剪强度值发现:①地基的固结度越高,固结应力就越大,同时等向固结方式对强度增长的影响也越大;②加固后地基强度增长率为32%～59%,并且在地表以下3～9m深度处强度增大相对较大。从而证明了真空-堆载联合预压的加固效果非常明显。
Taking the seventh contract section of Hangzhou (Hangzhou) Pudong (Shanghai Pudong) Expressway as the engineering background, the paper analyzes the characteristics of the strength increase of vacuum-surcharge combined pre-consolidation foundation by using effective stress method and effective consolidation pressure method respectively. Shear strength caused by shear creep is attenuated. By comparing the shear strength values before and after consolidation, it is found that: ① The higher the consolidation degree of foundation is, the larger the consolidation stress is, and the greater the influence of equal consolidation method on the strength growth is. ② The strength growth rate of reinforced foundation is 32% -59%, and the intensity increase is relatively larger at the depth of 3 ~ 9m below the surface. It proves that the consolidation effect of vacuum-pile preloading is very obvious.