强夯-降水联合加固饱和软粘土地基试验研究

In-situ test study on soft soils improvement by the DCM combined with dewatering

针对强夯法加固饱和软粘土地基时超静孔压消散难和易出现“橡皮土”的问题,提出将强夯和井点降水技术结合起来,利用井点降水技术来加速夯后超静孔压的消散和软土固结,并结合上海市某集装箱堆场工程中土部为吹填细砂、下部为饱和软粘土的地基进行了现场试验研究,对加固过程以及加固后的土体变形、超静孔压变化、工艺参数、加固效果和加固后土体的时间效应以及强夯的加固机理等进行了分析和讨论。强夯和井点降水技术的合理结合进一步拓宽了井点降水和强夯法的应用范围,为我国沿海地区广为分布的软土地基的加固问题提供了新的途径。

In order to avoid the occurrence of 'rubbery soil' in soft clay during the construction of dynamic consolidation method (DCM), an innovative idea of using well dewatering technique to accelerate the dissipation of excess pore water pressure and the consolidation of soft soil and to improve the efficiency of dynamic consolidation has been proposed. The in-situ test has been studied to verify the effectiveness of treating the soft clay underlying hydraulic fill sand by DCM combined with well dewatering on a container terminal in Shanghai; and soil deformation, pore pressure, time effect of soft clay strength have also been analyzed and discussed. The successful achievement of the field test and the large-area application show the feasibility of DCM combined with well dewatering in the treatment of soft soil and enriched the contents of the DCM and well dewatering technology; and also further broaden the application range of DCM and well dewatering. All the results in the test are referential to some other similar projects.