变动水压荷载对真空预压加固效果的影响

目前成功实施的几项潮差带地区真空预压工程未考虑膜上变动水压荷载的影响,单纯将膜下真空压力作为预压荷载,这明显偏于保守。根据具体工程的加固效果,分析膜上变动水压荷载对真空预压加固效果的影响,并给出在潮差带地区进行真空预压设计时预压荷载的取值方法,研究结果可供类似工程参考。

Influence of Varied Water Pressure Loading on Strengthening Effect of Vacuum Preloading

The vacuum preloading technique has often been applied to underwater soft-ground improvements in intertidal zones.However,in those construction activities,the varying water pressure load has not been considered,and the vacuum load was just taken as the vacuum pressure below the membrane.This treatment was obviously conservative.This research aims to analyze the effect of variant water pressure on the soil ground improvement through practice,and proposes a determination method for the vacuum load for the vacuum preloading technique in intertidal zones.The preloading may be taken as the sum of the vacuum load and the average water pressure above the membrane,and the latter should be calculated through the intertidal water level during the construction period and the ground elevation.This method for load determination may serve as a valuable reference for engineering design.