真空-堆载联合预压法加固软基适用条件探讨

Probing into the Applicable Condition by Vacuum Preloading Combined with Surcharge Preloading Method for Soft-base Reinforcement

运用真空 堆载联合预压法加固软基出现的加固效果不理想情况,除了设计或施工质量等原因之外,很大程度上是对该法的适用条件考虑不够.本文在介绍该法的加固机理及施工工艺基础上,结合某涵闸软基加固工程,探讨了真空 堆载联合预压法适用的场地、土质条件,针对表层土为砂土等分散性土质及加固区范围内有强透水层或地下暗河等情况,应采取适当措施处理,避免出现真空度下降造成效果不理想、延误工期.

For the unideal effect instance during applying vacuum preloading combined with surcharge preloading method for softbase reinforcement, the main cause, including design or construction quality, is placing little emphases on applicable condition of the method. Mechanism of vacuum preloading combined with surcharge preloading method and construction techniques are presented here. Combined with a culvert softbase reinforcement project, the ground and soil condition by vacuum preloading combined with surcharge preloading method for softbase reinforcement is discussed. Propriety measurement should be applied for disperse topsoil and high penetrative layer in reinforcement ground in order to avoid declining vacuum degree that make reinforcement effect unideal and increase construction period.