普通强夯与高速液压夯实工艺用于吹填砂层地基处理对比分析

依托大小嶝造地陆域形成及地基处理工程,通过试验区普通强夯与高速液压夯实工艺的现场试验对比研究,对2种施工工艺施工过程中夯坑沉降量、超静孔隙水压力和加固前后土层标准贯入击数进行检测。结果表明,采用2种工艺对吹填砂层加固后标贯值均满足不小于15击的要求,且液压强夯在4~6 m处中浅深度土层超静孔隙水压力值大于普通强夯,但普通强夯影响深度大于高速液压夯实工艺。高速液压夯实工艺适用于加固中浅深度吹填砂。

Comparative analysis of common dynamic tamping and high-speed hydraulic tamping process used in foundation treatment of reclaimed sand layer

Based on the Daxiaodeng land formation and foundation treatment project,we carry out the field-test comparative study on ordinary dynamic ramming and high-speed hydraulic ramming technology and test the standard penetration number of soil layers before and after reinforcement.The results show that the two processes can meet the design requirements of no less than 15 strokes after the blown sand layer is strengthened,and the ultra-static pore water pressure value at 4~6 m at mid-shallow depths by the hydraulic static tamping is greater than that by ordinary dynamic ramming.However,the impact of ordinary dynamic compaction is greater than that of high-speed hydraulic compaction.The high-speed hydraulic tamping process can be applied to the consolidation of the filled sand of mid-shallow depths.