水下挤密砂桩施工技术与加固地基特性分析  

Underwater sand compaction piles construction technology and reinforcing foundation characteristic analysis

作　　者：朱胜利[1] 喻志发[1] 李立新[1] 于健[1] 孟凡利 

机构地区：[1]中交天津港湾工程研究院有限公司天津市港口岩土工程技术重点实验室港口岩土工程技术交通行业重点实验室,天津300222 [2]中交一航局第一工程有限公司,天津300456

出　　处：《中国港湾建设》2015年第10期13-17,共5页China Harbour Engineering

基　　金：国家支撑计划课题项目(2011BAG07B02)

摘　　要：结合水下挤密砂桩工程应用情况,对加固机理、适应地质条件及施工参数确定方法进行介绍,并采用数理统计方法对桩身密实度分布、复合地基沉降、成桩后地表隆起情况、砂桩的检测时间等进行分析,得出工法可用于抗剪强度Cu大于6.0 k Pa的软黏土,桩体平均密实度不随检验间隔时间而变化,成桩桩体平均密实度可达到中密以上,复合地基沉降主要发生在施工期,工后沉降较小且工后沉降速率收敛显著等结论。Combined with the application of underwater sand compaction pile engineering, we introduced the reinforcement mechanism and adapt to the geological conditions and construction parameters determination method,and analyzed the pile body compactness distribution, composite foundation settlement, foundation surface uplift, and sand pile testing time determination using the method of mathematical statistics. The result shows the drawing method can be used in the soft clay of Cu is greater than 6.0 kPa, the pile body average compaction does not change according to the inspection interval, completed pile body average compaction can achieve more than medium compactness,composite foundation settlement occurs mainly in the construction period, the post-construction settlement is small and the post-construction settlement rate of convergence is remarkable.

关 键 词：挤密砂桩 桩身密实度 复合地基沉降 隆起 

分 类 号：U655.54[交通运输工程—港口、海岸及近海工程] TU472.32[交通运输工程—船舶与海洋工程]