真空-堆载联合预压加固软基的特点和应用

Characteristics and Application of Vacuum Combined Surcharging Preloading Method in Soft Foundation Treatment

介绍了真空-堆载联合预压法的发展概况及特点。结合现场监测数据,对真空-堆载联合预压加固区的地表沉降、分层沉降、孔隙水压力随时间的变化规律进行分析。结果表明:真空堆载联合预压能加快地基沉降的速率,大幅消除地基沉降,减少工后沉降量,是一种行之有效的软土地基处理方法。联合堆载预压阶段,真空预压引起的负的超静水压力与堆载引起的正的孔隙水压力不会抵消,也不是两者简单的叠加。

The development and characteristics of vacuum combined surcharging preloading method was introduced.Based on the field monitoring data,the change law of surface settlement,layered deposition and pore water pressure in reinforced area by vacuum combined surcharging preloading method with time were analyzed.The results show that vacuum preloading pressure method can speed up the rate of foundation settlement,eliminate the surface settlement greatly after the construction,and it was an effective method of the treatment of soft soil.The phase of the joint preloading,the excess hydrostatic pressure induced by the vacuum preloading and the positive pore water pressure caused by preloading were not offset,nor were a simple superposition of them.