不同能级强夯法处理新近吹填粉细砂地基现场试验  

Field test on recently reclamation silty fine sand foundation treated by different energy levels of dynamic compaction

作　　者：周宝江[1] 邵旭[1] ZHOU Baojiang;SHAO Xu(CCCC FirstHarbour Consultant Co.,Ltd.,Tianjin 300222,China)

机构地区：[1]中交第一航务工程勘察设计院有限公司,天津300222

出　　处：《水运工程》2024年第9期238-244,共7页Port & Waterway Engineering

摘　　要：某矿石码头堆场表层由新近吹填形成的松散粉细砂组成,地下水位及黏粒含量均较高。为验证强夯法进行地基处理的可行性以及优化施工参数,拟在处理厚度为6和9 m的两个区域设立施工试验区,分别采用2000和4000 kN·m的夯击能进行强夯试验,施工同时监测夯击过程中孔隙水压力、夯沉量等变化情况,施工完成后进行现场标准贯入试验和荷载试验,并给出单位面积夯击能与夯沉量的双曲线关系式。结果表明,孔隙水压力消散时间约为2 d,每一点夯的最优夯击数为7~8击;处理后的地基承载力较处理前显著提高,且达到了设计文件中200 kPa的承载力要求。The surface layer of an ore wharf yard is composed of loose silty fine sand by recently reclamation,and the underground water level and mud content are relatively high.In order to verify the feasibility of foundation treatment by dynamic compaction method and optimize the construction parameters,we set two testing areas with treatment thicknesses of 6 m and 9 m,carry out 2,000 kN·m and 4,000 kN·m energies of dynamic compaction in test areas,and at the same time monitor pore water pressure and dynamic compaction settlement in the construction process.After the completion of the treatment,we carry out SPT and load test,and give the formula of the hyperbolic relationship between dynamic compaction energy and tamping volume.The results show that the dissipation period of pore water pressure is about two days,and the optimal number of each dynamic compaction point is seven to eight.The bearing capacity of the foundation is significantly improved,reaching the design bearing capacity of 200 kPa after the dynamic compaction.

关 键 词：新近吹填 强夯 孔隙水压力 荷载试验 

分 类 号：TU472.3[建筑科学—结构工程] U656.134[建筑科学—土工工程]