不同场地条件下长桩的承载性状研究
摘要:根据软土地基、非软土地基中长钻孔灌注桩静载荷试验和桩身轴力的测试结果,分析探讨了竖向荷载下长桩的受力性能及沉降特征的一些规律。桩侧土模量较高的非软土地区的长桩静力试桩所测得的结果表明,荷载传递和桩身压缩与软土地区超长桩性状相似,长桩的桩身压缩量相当可观,计算中应予以考虑。极限侧阻力与端阻力不同步发挥,不同深度处的不同土层处基桩的侧阻也不能同步发挥;同时指出相关规范中极限承载力计算公式的不严密之处,并且探讨说明了竖向荷载下的长群桩基础变形性状及沉降计算有待进一步的研究。本项研究对今后超长桩的理论研究和工程设计应用具有一定的借鉴作用。
Abstract:Based on the stastic tests' results of long piles in different strata, some conclusions about the load transfer mechanism and settlement of long piles under vertical loads are drawn. The settlement behavior of long piles in hard soil ground are simillar to the super-long piles in soft soil ground. The value of elastic compression of pile shaft are at a high proportion of the pile settlement, it should be considered in the settlement calculation. The ultimate capacity of end resistance and lateral resistance are not occurred in the same time under vertical loads. The ultimate capacity of lateral resistance are not occurred in the same time in different layers for a pile. We discussed the applicability of the ultimate bearing capacity formula of the Technical Code. At last,the authors point that the transfer mechanism and settlement of long piles' group foundation should be furher studied. And some important references for the theoretical research and technical application of super long piles are provided.
中文标题：
不同场地条件下长桩的承载性状研究
Study on the Transfer Mechanism and Settlement of Long Piles in Differnet Strata
作者：
秋仁东1,孙轶斌2,石玉成3
QIU Rendong1,SUN Yibin2,SHI Yucheng3
作者简介:秋仁东,1981年生,男,满族,辽宁大连人,博士研究生,主要从事基础工程与桩基础的研究工作。E-mail:qiurend@163.com
通讯地址：
1. 中国建筑科学研究院, 北京 100013; 2. 河南省建筑科学研究院, 河南郑州 450053; 3. 中国地震局兰州地震研究所, 甘肃兰州 730000
1.ChinaAcademyofBuildingResearch,Beijing100013,China; 2.HenanProvincialAcademyofBuildingResearch,Zhenzhou450053,Henan,China; 3.LanzhouInstituteofSeismology,CEA,Lanzhou730000,Gansu,China
中图分类号:TU473.12
doi:10.3969/j.issn.1007-2993.2010.03.002
出版物：岩土工程技术
收稿日期:2010-04-13
网络出版日期:2021-07-06
关键词:长桩,桩身弹性压缩,极限承载力
Key words:long pile,elastic compression of pile shaft,ultimate bearing capacity
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基金项目：
基金项目: 国家自然科学基金资助项目(50878200)
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