振冲密实法在人工吹填砂土地基处理中的应用  

Application of vibro-compaction method in treatment of artificial dredger fill sandy soil foundation

作　　者：宋大军 严军[2] 卢一林 许奎鑫 徐小迟 高文斌 程昭 SONG Dajun;YAN Jun;LU Yilin;XU Kuixin;XU Xiaochi;GAO Wenbin;CHENG Zhao(Changjiang Wuhan Waterway Engineering Bureau,Wuhan 430014,China;North China University of Water Resources and Electric Power,Zhengzhou 450046,China)

机构地区：[1]长江武汉航道工程局,湖北武汉430014 [2]华北水利水电大学,河南郑州450046

出　　处：《水运工程》2024年第10期188-193,共6页Port & Waterway Engineering

摘　　要：吹填土含水率较高,有着低强度、高压缩性、欠固结等不足,现有强夯、加填料固结等方式加固效果不理想。依托厦门大小嶝造地工程,通过控制不同变量,如振冲频率、振冲方式和施工手段,开展人工吹填砂土地基加固试验,确定适合吹填砂土地基的频率参数和振冲方式。结果表明:振冲密实法能够满足吹填砂土地基的加固要求,施工后承载力和标贯击数得到较大提高,加固后承载力达到150 kPa,一半的试验区标贯击数超过30击,满足后续施工标准要求,证明了振冲密实法适用于吹填砂土地基的加固,土体达到中密状态;该方法能够降低施工消耗,提高经济效益。Dredger fill with high moisture content,has disadvtanges of low strength,high compression,and underconsolidation.It is unsatisfactorily reinforced by strong tamping and consolidation with filler.Relying on Daxiaodeng land creation project in Xiamen,we apply different parameters of vibro-compaction to the reinforcement of artificial dredger fill sandy soil foundation,such as vibration frequency,vibration mode and construction method,and determine the frequency parameter and vibration mode suitable for dredger fill sandy soil foundation.The results show that dredger fill sandy soil foundation is effectively reinforced by vibro-compaction method.After the construction treatment,the bearing capacity of the foundation and the standard penetration hit number are improved.After being worked,the foundation has a bearing capacity of 150 kPa,and the standard penetration hit number for about half of test area exceed 30,which meets the standard for subsequent construction.The soil reaches medium density state.It proves that the vibro-compacting method is suitable for the reinforcement of dredger fill sandy soil foundation.The method can reduce the construction consumption,and improve the economy and benefit.

关 键 词：振冲 吹填砂土 加固效果 

分 类 号：TU472[建筑科学—结构工程] U655.54[建筑科学—土工工程]