真空预压施工影响范围预估和既有道路保护

Estimation of influence range of vacuum preloading construction and protection of existing roads

在既有道路周边使用真空预压工艺处理软土地基时,需要考虑真空预压施工对既有路基的影响,并保障既有道路的安全运行。以实际工程为例,通过类似工程总结修正经验公式,计算结果表明:既有道路位于真空预压影响范围内,为了既保障东堤路的安全运行,又保证地基处理的效果,采用在既有道路靠真空预压处理区一侧设置15 m宽度的保护区,采用长短板的方式,从远离道路的一侧向东堤路方向的塑料排水板长度由8.0 m递减至3.0 m,采用堆载预压的方式处理,堆载高度3.0 m。针对东堤路的保护,施工期设置水平和垂直位移、沉降等监测,在前期方案设计和施工期监测的双重保障下,最终顺利完成地基处理施工。

When using vacuum preloading technology to treat soft soil foundations around existing roads,we should consider the influence of vacuum preloading construction on existing roadbed and ensure the safe operation of existing roads.Taking an actual project as an example,this paper summarizes and corrects the empirical formula through similar projects,and the calculation results reveal that the existing road is within the influence range of vacuum preloading.To ensure the safe operation of Dongdi Road and the effect of foundation treatment,we set a protection zone with a width of 15 m on the side of the existing road near the vacuum preloading treatment area,use long and short plates with the length of the plastic drainage plate reduced from 8.0 m to 3.0 m from the side far of the road to Dongdi Road,and adopt the stacking preloading method with the stacking height of 3.0 m.For the protection of Dongdi Road,we monitor the horizontal and vertical displacement and settlement during the construction period.Finally,under the double guarantee of the earlier scheme design and monitoring during the construction period,the foundation treatment construction has been smoothly completed.