深厚软基抛石挤淤技术应用研究

Application Research on Technology of Dumping Rockfill for Extruding Silt in Deep Soft Subgrade

为研究抛石挤淤在深厚软粘土地基中的置换机理和效果,通过室内离心模型试验并结合现场检测及监测等多种手段,对抛石挤淤技术在连云港地区深厚软粘土中的应用情况展开系统研究。研究结果表明:抛石挤淤体通过加快下卧层孔压消散来提高地基强度,同时路基两侧的反压护道能有效限制挤淤体的扩散;抛石挤淤浅层换填方式能大幅提高淤泥路基强度,挤淤后路基侧向变形稳定;对于石料来源丰富的地区,抛石挤淤工法具有施工进度快且经济节约的优点,值得推广。

In order to obtain the replacement mechanism and effect of technology of dumping rockfill for extruding silt in deep soft subgrade,based on laboratory centrifugal model test and in-situ detection and monitoring method,its application in the deep soft clay in Lianyungang city was systematically studied.Results show that the extruding silt body improves the subgrade soil strength by accelerating the dissipation of pore water pressure in subjacent layer and the back berms on both sides of the subgrade can effectively restrain the spread of the extruding silt body.The shallow soil replacement method of technology of dumping rockfill for extruding silt can greatly improve the strength of the silt subgrade and the lateral deformation of the subgrade after extruding silt is small.For the rich areas of stones,the technology of dumping rockfill for extruding silt possesses the advantages of fast construction and economy,and it deserves to be generalized in others areas.