强夯法加固机场道基的现场试验研究

Field Experimental Study on Strengthening Airport Roadbed with Dynamic Compaction Method

为研究强夯法在机场填海大面积道基处理的适用性,依托沿海某机场吹填地基工程,进行强夯现场试验,通过标准贯入度试验、面波检测,并结合现场沉降、孔隙水压力、过程中振动、深层水平位移等监测项目,对强夯试验过程中填海道基性能变化及位移规律进行分析。结果表明:强夯有效加固深度为6 m~10 m;工后沉降速率为0.03 mm/d~0.08 mm/d。6000 kN·m夯击能级作用下,建筑物安全距离为37.5 m。强夯对提高中细砂密实度、减少工后沉降效果明显,但孔隙水压力变化仅在强夯期间有明显影响。研究结果可为强夯在沿海城市机场道基工程中的应用及推广提供参考。

In order to analyze the applicability of dynamic compaction method for the treatment of airport reclamation fill foundation,field tests were conducted based on a beachfill foundation project at an airport in a coastal area.Through standard penetration tests,surface wave inspections and monitoring of onsite settlement,pore water pressure,vibration during the process and deep horizontal displacement,the changes in the performance and displacement laws of the fill foundation during the dynamic compaction process were analyzed.The results showed the effective reinforcement depth of dynamic compaction for the project is 6 to 10 meters,and the postcompaction settlement rate is 0.03 mm/d to 0.08 mm/d.The safety distance for buildings under the energy levels of 1000 kN·m to 6000 kN·m is about 37.5 meters.That dynamic compaction significantly improves the density of medium and fine sand and reduces postcompaction settlement,but the change in pore water pressure only has significant impacts during dynamic compaction.The research results can provide reference for the application and promotion of dynamic compaction in coastal city airport road foundation projects.