不同能级强夯加固处理现场试验对比

开展6 000和10 000 k N·m能级强夯的现场试验,以强夯前后多道瞬态面波测试和重型动力触探试验方法,对强夯处理效果进行测试。试验结果表明:强夯加固处理后地基承载力和土体工程特性得到改善,但地基承载力特征值和压缩模量局部深度仍不能满足设计要求;6 000和10 000 k N·m能级有效加固深度分别为6.0~7.0 m和7.0~8.0 m;10 000 k N·m能级试验区浅层加固处理效果较差,与浅层存在淤泥质土、夯坑回填方式及第3遍夯点间距过大和夯能过小等因素有关,需采取相应的处理措施。

Field test on dynamic compaction treatment of different energy-levels

Based on the foundation treatment practice of a large-scale engineering,we carry out a field test on the dynamic compaction of 6 000 and 10 000 kN?m energy-level respectively and test the treatment effect of the two energy-levels by multi-channel transient surface wave test and heavy dynamic penetration test before and after the dynamic compaction.The test result reveals that:the bearing capacity of foundation and engineering characteristics is improved after the dynamic compaction,and the bearing capacity of foundation and compression modulus of part depth cannot satisfy relative requirements after the dynamic compaction;the effective reinforcement depth of 6 000 and 10 000 kN?m are about 6.0 to 7.0 m and 7.0 to 8.0 m;due to the existence of mucky soil in the shallow layer,backfilling method of hollows,as well as the large spacing and small compaction energy of the 3rd time compaction point,the treatment effect of shallow layer is poor in 10 000 kN?m energy-level zone.Thus,measures shall be taken to improve the condition.