不同能级强夯处理软弱地基效果分析

依托广西钦州港区某大型工程地基处理实践,基于强夯前后多道瞬态面波测试和重型动力触探试验及夯后静载荷试验,对不同能级强夯加固处理软弱地基效果进行了检测与分析。现场检测结果表明:强夯加固处理后软弱区域地基承载力特征值和压缩模量仍不满足设计要求;软弱区外各能级区经过强夯处理后,地基承载力和土体工程特性得到明显改善,地基承载力特征值和压缩模量基本满足设计要求;2 000,3 000,6 000,8 000,10 000,12 000 k N·m能级有效加固深度分别约为2.5,4.0~6.0,6.0~8.0,7.0~10.0,8.0~11.0,8.0~13.0 m;建议对软弱区域根据基坑开挖深度采取相应的加固处理措施。结论以期为类似工程地质条件地基处理提供借鉴与参考。

Effect analysis of different energy-level dynamic compaction on soft foundation

In the foundation treatment of a large-scale project in Qinzhou port of Guangxi Province, the treatment effect of dynamic compaction on soft foundation under different energy-levels is analyzed in detail based on multi-channel transient surface wave test, heavy dynamic penetration test before and after dynamic compaction, and static load test after dynamic compaction. The results show that the bearing capacity and compression modulus of the foundation in soft area do not meet design requirements after dynamic compaction; the bearing capacity of the foundation and engineering characteristics of the soil outside the soft area were improved after dynamic compaction, and the bearing capacity and compression modulus of the foundation basically meet correlative requirements; the effective reinforced depths under the energy levels of 2000, 3000, 6000, 8000, 10000, 12000 kN.m were about 2.5, 4.0 to 6.0, 6.0 to 8.0, 7.0 to 10.0, 8.0 to 11.0 and 8.0 to 13.0 m respectively. It is suggested that some reinforcement measures should be taken according to pit excavation depth of the soft area. The experience and results could be referred to by other foundation treatment with similar geotechnical conditions.