垫层强夯法在岩溶地貌地基处理中的试验研究

Dynamic Consolidation on Cushions for Karst Landform Foundation Treatment

为确保神龙架新机场工程的顺利实施,基于岩溶地貌工程特性,以及强夯的施工原理,采用垫层强夯法对机场岩溶洼地和岩溶漏斗进行地基处理。按照地基处理设计参数要求,试验中对垫层料密度及级配进行了检测,并对强夯夯沉量,地基处理前后的标准贯入试验、波速测试、载荷试验等的实际效果进行了统计分析,结果表明采用垫层强夯地基处理对神龙架新机场岩溶地貌较为适宜,能有效提升地基承载力。本次试验为神龙架新机场岩溶地貌大面积地基处理提供了试验依据,可为同类工程项目参考。

To ensure the smooth construction of new airport project in Shenlongjia, the karst depressions and karst cones were treated by dynamic consolidation with cushions on the foundation. According to the design parameters of foundation treatment requirements, the density and particle size distribution of cushion material were tested. The settlement of foundation by the dynamic consolidation, the standard penetration test before and after foundation treatment, wave velocity test and load test were also analyzed. Results demonstrate that dynamic consolidation method with cushion is suitable for the treatment of Karst landform foundation at Shenlongjia new airport project. It could effectively improve the bearing capacity of Karst landform foundation. The tests in this research provide basis for this project and also for other similar projects.