无填料振冲法加固吹填粉土地基现场试验研究  

Local test study of vibroflotation on hydraulic backfilled powder soil foundation without additional backfill materials

作　　者：邓雷飞[1] 韩冉冉[1] DENG Lei-fei;HAN Ran-ran(Tianjin Research Institute for Water Transport Engineering,National Engineering Laboratory for Port Hydraulic Construction Technology,Key Laboratory of Harbor & Marine Structure Safety,Ministry of Transport,Tianjin 300456,China)

机构地区：[1]交通运输部天津水运工程科学研究所港口水工建筑技术国家工程实验室水工构造物检测诊断与加固技术交通行业重点实验室,天津300456

出　　处：《水道港口》2019年第1期87-92,共6页Journal of Waterway and Harbor

基　　金：国家自然科学基金项目(51809132);中央公益性科研院所基本科研业务费(TKS170102)

摘　　要：无填料振冲法适用于加固砂土地基,但对吹填粉土地基处理效果尚不明确。为了研究无填料振冲法加固吹填粉土地基的可行性,结合潍坊港某吹填造陆工程,通过现场监测孔隙水压力、土体沉降、分析了无填料振冲过程中孔隙水压力及沉降变化特点,并结合加固前后标准贯入试验和平板载荷试验对地基处理效果进行了对比。试验结果表明:距振冲点距离越远,孔隙水压力增加的幅度越小,且超静孔隙水压力在每遍振冲后1 h内孔隙水压力消散约80%;无填料振冲加固后振冲点附近地面沉降值随着距振冲点距离的增大呈对数衰减。现场检测数据表明:加固后土体密实度显著增大,地基承载力得到了较大的提高。The vibroflotation method without additional backfill materials is suitable for strengthening sandy soil foundation,but the effect of treating hydraulic backfilled powder soil foundation is not clear.In order to study the feasibility of vibroflotation method to reinforce the soil foundation,the pore water pressure and soil settlement were monitored and analyzed in a land reclamation project in Weifang port,and the treatment effect was verified by comparing before and after the reinforcement of standard penetration tests and load-plate test.It is show that:the further away from the vibroflotation point,the smaller the increase of pore water pressure;and the pore water pressure dissipates about 80% within 1 hour after each time of vibroflotation;the ground settlement value near the vibroflotation point decreases logarithmically as the distance from the vibroflotation point increases.The field test data show that the soil compactness increases significantly and the bearing capacity of foundation is improved greatly after reinforcement.

关 键 词：振冲法 孔隙水压力 土体沉降 承载力 

分 类 号：U65[交通运输工程—港口、海岸及近海工程]