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作 者:田龙龙 熊玉成 TIAN Longlong;XIONG Yucheng(Beijing Design Division,China Petroleum Engineering&-Construction Co.,Beijing 100085)
机构地区:[1]中国石油工程建设有限公司北京设计分公司,北京100085
出 处:《土工基础》2021年第6期654-658,共5页Soil Engineering and Foundation
摘 要:以广东沿海某钻孔灌注桩试桩工程为背景,根据沿海区域大厚度粉细砂层夹杂碎石、淤泥层的复杂地质条件下进行的超长DX试验桩施工及检测结果,采用FLAC^(3D)差分数值模拟软件,模拟了DX桩受力破坏情况下的桩土共同作用应力场分布、沉降变形规律、地基土塑性区分布、桩身轴力及支盘体截面应力变化等,分析探讨了DX桩荷载传递机理、承载特性和破坏形式,并与试桩检测结果进行对比分析。The DX pile is a new proprietary type of bored reinforced cast-in-place concrete pile with multiple enlarged shaft sections.This paper presents a case history of the installation,analysis,and load testing of long bored DX piles in Guangdong coastal area.The coastal project site is characterized with soft peaty soils and thick silty fine sand with gravel.The commercial finite difference software,FLAC^(3D),was used to simulate performance of the DX pile under failure load.The stress field distribution,development of settlement at pile,development of plastic zone in the surrounding soils,axial force in the pile and the stress changes in the enlarged shaft sections are evaluated.The loading transfer mechanism and failure mode under axial loading are discussed in the paper.The results are also compared with the test results.
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