摘要
依托沿海地区某大型工程地基处理实践,开展无填料振冲和强夯法加固地基的现场试验对比。施工结束后,采用孔隙水压力测试、标准贯入试验、静力触探试验及平板载荷试验等原位测试方法取得相关试验数据。对孔隙水压力变化、地基的承载性能及砂土液化处理效果进行评价和分析,得出如下结论:无填料振冲处理效果差,本场地地质条件下不适宜采用该方法进行地基处理;使用强夯法对地基处理后土体工程特性有了明显改善,地基承载力得到提高,液化可能性得到消除;场地中分布的软土夹层对强夯加固效果有较大的影响,夯后地基承载力和压缩模量有所减小;5 000 k N·m能级强夯加固深度约为10 m。
Based on the foundation treatment practice of a large-scale project in the coastal region, we carryout a comparative test of vibroflotation backfill and dynamic compaction to soft foundation treatment. Afterconstruction, we take some in-situ test measures including monitoring of pore water pressure, standard penetrationtest, static cone penetration test and plate loading test to evaluate the pore water pressure changing, the bearingcapacity of foundation and liquefaction of sand.Conclusions are drawn as follows： Firstly, the effect of vibroflotationwithout backfill method is unsatisfactory and unsuitable for the foundation treatment under the geotechnic conditionof this project. Secondly, the dynamic compaction method has an obvious compaction effect on improving thegeotechnical engineering properties of soil.The foundation bearing capacity is increased, and the possibility of sandliquefaction can be also eliminated.Thirdly, the reinforcement is greatly affected when soft soil interlayer exists below10 m depth.Under that condition, the soil bearing capacity and compression modulus could not be improved.Finally,the reinforcement depth of 5 000 kN-m energy-level dynamic compaction is about 10 m.
出处
《水运工程》
北大核心
2016年第11期167-173,共7页
Port & Waterway Engineering
基金
中国石油工程建设公司科学研究与技术开发项目(CPECC2011KJ22)
关键词
大型工程
现场试验
无填料振冲
强夯法
地基处理
large-scale engineering
in-situ test
vibroflotation without backfill
dynamic compaction method
foundation treatment
