水气分离集成井降水强夯法试验研究

Experimental study of moisture separator integrated wells dewatering-dynamic compaction

为了克服降水强夯法处理深度小、降水时间长的缺陷,结合扬中灏港通用码头软土地基处理工程,改进了传统降水强夯工艺,采用水气分离集成井降水联合强夯法进行加固处理。通过在常规真空井点降水强夯和改进降水强夯两个试验区开展现场监测和检测试验,对加固效果进行了对比评价分析,研究结果表明：水气分离集成井降水强夯工艺降水深度可达地表以下5-6 m,夯后孔压消散时间约为1~2天;地基加固后总地表施工期最大沉降量为0.606 m,可有效减小工后沉降;与常规井点降水强夯法相比,改进法加固后土体强度和地基承载力均有较大提高,地基加固效果优势明显。

In order to overcome its defects of insufficient depth and dewatering long time, combining the soft foundation treating engineering of Yangzhong Haogang all - purpose wharf, the traditional de- watering- dynamic compaction ig improved, in which moisture separator integrated wells dewatering - dynamic compaction is used to consolidate the soft foundation. Field monitoring and testing are car- ried out in two experimental sites, respectively the conventional vacuum wells dewatering -dynamic compaction, and another treated with the improved dewatering- dynamic compaction. The results show that dewatering depth of the improved dewatering - dynamic compaction could reach 5 - 6m be- low the surface, and the dissipating time of the pore water pressure after tamping is 1 to 2 days; the maximum settlement of the surface during the construction after the foundation consolidation is 0. 606 m, thus the post -construction settlement is effectively reduced; compared to the conventional vacu- um wells dewatering - dynamic compaction, both the soil strength and bearing capacity of the founda- tion have substantially improved. Thus it can be seen, the effect of the foundation consolidation is no- table.