真空预压影响区土体变形机理及防治措施研究

Soil deformation mechanism and prevention measures in vacuum preloading affected zone

真空预压法是一种常用的软土地基处置,在真空荷载作用下,软土地基会产生向面向加固区的侧向收缩变形,甚至出现收缩裂缝,从而对真空预压影响区域内的建筑物造成不利影响.目前,对真空预压影响区土体的变形机理的研究还很少,笔者对此做了分析研究,得出诱导变形是影响区土体变形的最主要原因.结合数值计算,分析了联合堆载、隔离墙两种防治措施的效果,两种防治措施都能有效减小真空预压边界附近影响区土体的水平位移,减小真空预压对边界附近建筑物的影响.

Vacuum preloading method is widely used as a soft foundation treatment method.Application of vacuum preloading to improve soft brings about a horizontal displacement in the vacuum affected zone and leads to an adverse impact on the surrounding buildings.An insight into the deformation mechanism of the vacuum affected zone is need.Therefore,the deformation mechanism of the vacuum affected zone and the prevention measures were studied in this paper using numerical analysis.The deformation control measures of combined vacuum with fill loading,separating wall can effectively reduce horizontal displacement in vacuum preloading affected zone and reducing the vacuum preloading impact on the building near the vacuum improved area.