真空预压对既有道路影响的对比分析

Comparative analysis on the influence of vacuum preloading on the existing highway

应用真空预压法进行软基处理时,针对排水板打设深度、布置方式和压力加载方式的不同对既有公路影响进行对比分析,提出降低对公路桩基和路面影响的真空预压布置形式。选择不同排水板打设深度以及荷载加载方式进行组合,并应用有限元软件对真空预压处理效果和影响范围进行仿真分析。计算结果显示,采用40 k Pa抽真空荷载加41 k Pa堆载预压荷载的处理方案,产生的变形影响程度和距离相对最小;降低排水板打设深度并采用真空联合堆载预压的方案可以削弱对既有公路的影响。

When vacuum preloading method is used to treat soft foundation, the influence of the setting depth, layout mode and pressure loading mode of the drainage plate on the existing highway is analyzed and compared, a layout mode of vacuum preloading to reduce the impact of the pile foundation and pavement is put forward. We chosen the combination of different setting depth and loading modes of drainage plate used the finite element software to simulate the effect of vacuum preloading treatment and its influence range. The calculations show that the deformation and the influence distance are small by using the 40 kPa vacuum loading and 41 kPa surcharge load preloading. Reducing the depth of the drainage plate and using the vacuum combined surcharge preloading can weaken the influence to the existing highway.