快速加固吹填土的室内模拟试验

吹填造陆是解决沿海地区建设用地不足的主要方法之一。为了使吹填土在较短的时间内获得较好的加固效果，结合吹填土特殊工程地质性质和加固过程中强度增长具有阶段性的特点，提出了边吹填边加固的加固思路。在该思路的指导下进行室内模拟试验。试验发现不同加固阶段吹填土强度增长表现出明显的分带性；与竖向排水体距离小于25 cm的土体强度增长较快；随着加固时间的延长，待加固土体强度整体增长；当持续真空加荷一个月时，部分待加固土体承载力已达到80 kPa。可以看出，强度增长与外部荷载的大小、渗透路径的长短、附加应力的大小密切相关。分阶段加固的方法在一定程度上抑制了泥皮的形成，缩短了真空加荷时间，节约工期，有利于吹填土的加固。

Indoor Simulation Test of Quick Consolidation for Dredger Fill

Hydraulic fill had become one of main method to make up for the deficiency of construction land in the coastal regions. In order to obtained the better consolidation effect of dredger fill in a relatively short period of time, considering dredger fill’s special engineering geological nature and periodic strength growth in the strengthening process, the idea about reinforcement at the same time of blowing has been proposed. Indoor simulation experiment carried out under the guidance of the idea. Test results showed that different stages of dredger fill reinforcement strength showed growth zoning. Soil strength increased rapidly when the distance between the soil and vertical drain body was less than 25 cm. With the reinforcement of time extension the strength of reinforced soil increased in the overall. When the vacuum load lasted one month, some of reinforced soil’s bearing capacity had been reached 80 kPa. Strength of growth was closely related to the size of the external load, the length of the infiltration path, size of additional stress. Step-by-step reinforcement method inhibited the formation of clay ring to some extent, Shorten the vacuum loading time and save time. Step-by-step reinforcement method is advantageous for dredger fill’s consolidation a reinforced fill.