挤密碎石桩处理场地液化砂土研究  

Research on Treatment of Site Liquefi ed Sand with Compacted Gravel Pile

作　　者：孟祥月 MENG Xiangyue(Shenzhen Guanghuiyuan Environment Water Co.,Ltd.,Shenzhen 518000,Guangdong,China)

机构地区：[1]深圳市广汇源环境水务有限公司,广东深圳518000

出　　处：《工程技术研究》2024年第15期111-113,共3页Engineering and Technological Research

摘　　要：砂土液化作为地震灾害的一种,会导致出现地基喷砂冒水、地基破坏等问题。文章依托月亮湾海堤工程,采用规范方法对场地填砂进行液化判别。为消除填砂液化沉降,提出了挤密碎石桩的处理措施。通过标准贯入试验、重型动力触探试验及复合地基荷载试验,评估了挤密碎石桩的处理效果,并复核处理后的地基承载力。研究表明,挤密碎石桩处理对地基深层土体的标准贯入击数改善效果更好,场地填砂层由轻微液化变为不液化;三根试验桩大部分桩身的锤击数均超过七次,可见大部分桩身均处于密实状态;经挤密碎石桩加固后的土层,地基承载力显著提升,满足设计要求。Sand liquefaction,as a kind of earthquake disaster,will lead to problems such as sand blasting,water gushing and foundation damage.Based on the Moon Bay seawall engineering,this paper adopts the standard method to judge the liquefaction of site filling sand.In order to eliminate the liquefaction settlement of filling sand,the treatment measures of compacted gravel pile are put forward.Through standard penetration test,heavy dynamic penetration test and composite foundation load test,the treatment eff ect of compacted gravel pile is evaluated,and the bearing capacity of the foundation after treatment is reviewed.The research shows that the compacted gravel pile treatment has a better eff ect on improving the standard penetration count of deep foundation soil,and the sand fi lling layer of the site changes from slight liquefaction to non-liquefaction;the blow count on most of the three test piles is more than 7,which shows that most of the piles are in a dense state;the foundation bearing capacity of the soil layer reinforced by compacted gravel pile is signifi cantly improved,which meets the design requirements.

关 键 词：挤密碎石桩 砂土液化 原位测试 复合地基承载力 

分 类 号：TU473.1[建筑科学—结构工程]