临水域软土地区超大深基坑的分区水冲开挖技术初步研究

Preliminary Study on Subarea Water-washing Excavation Technology of Extra-large Deep Foundation Pit in Soft Soil Area Adjacent to Water

在软土地区,尤其是在临近水域处,超大深基坑开挖施工可运用水力冲挖法。依次介绍了水冲法的工艺原理、特点、方案、流程,以及设备和人员配置情况。文中以超大深基坑分区后的某单块基坑为例,分析了水冲法和传统机械开挖的效率,测算了经济成本,归纳出可能的技术问题,并提出相应的解决方案。经对比分析可知,水冲法非常适合临近水域的超大基坑的开挖,可应用在诸如大型机场航站楼在内的大型基坑的开挖。

In the soft soil areas,especially adjacent to water,the water-washing method can be used for the excavation of extra-large deep foundation pits.The technological principle,characteristics,scheme and technological process of water washing method,and the equipment and personnel allocation are introduced.Take a single foundation pit in the subarea of extra-large deep foundation pit as an example,the efficiencies of the water washing method and traditional mechanical excavation are analyzed,and the economic cost of these methods are calculated in order to summarize the possible technological problems and to propose the relevant solutions.The comparison and analysis results show that the water-washing method is very suitable for the excavation of extra-large foundation pits adjacent to water,and can be used in the excavation of large foundation pits in the many large airport terminals.