挤密砂桩单桩承载性能分析  

Analysis on bearing capacity performance of sand compaction pile under free single pile

作　　者：朱俊易 张曦 吴心怡 马险峰[2] 

机构地区：[1]中交上海港湾工程设计研究院有限公司,上海200032 [2]同济大学,上海200092

出　　处：《中国港湾建设》2016年第6期7-10,24,共5页China Harbour Engineering

基　　金：国家支撑计划课题项目港珠澳大桥跨海集群工程建设关键技术研究与示范(2011BAG07B00)之课题二外海厚软基桥隧转换人工岛设计与施工关键技术(2011BAG07B02)

摘　　要：通过离心模型试验来代替现场原位试验对砂桩的单桩承载力进行了模拟,试验考虑了不同土质和地表荷载的存在对挤密砂桩单桩承载力的影响。试验结果表明,地基土为黏性土的单桩承载力比淤泥土的单桩承载力大;土体表面有荷载时的单桩承载力比无荷载的承载力大。利用相关承载力计算公式对挤密砂桩的单桩承载力进行计算分析,结果表明Brauns计算法和被动土压力法的修正公式与离心试验结果最接近,并以上海洋山深水港区挤密砂桩复合地基为例对公式进行初步验证。研究结果为水下挤密砂桩的单桩极限承载力计算提供参考。The centrifuge model tests on sand compaction pile under free single pile are performed to examine the ultimatebearing capacity. The tests consider two different conditions. The results of tests show the bearing capacity of sand pile incohesive soil is larger than that in silt soil. The bearing capacity of sand pile with surface loading is larger than that withoutsurface loading. And then the centrifugal model tests results are used to verify the rationality of the formula for calculating thebearing capacity. On the basis of the calculated results a modified model was proposed. The results show that the Braunsmodified model and passive earth pressure modified model have small difference with other formula. At the same time, thispaper takes Yangshan Port area in Shanghai as an example to verify the modified model.The research result provides referencefor the calculation of the extreme bearing capacity of a single underwater sand compaction.

关 键 词：挤密砂桩 离心试验 单桩承载力 修正公式 

分 类 号：U652.7[交通运输工程—港口、海岸及近海工程] TU473.1[交通运输工程—船舶与海洋工程]