接触面特性对双排桩支护性状的影响分析
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（河海大学岩土工程研究所，南京 210098）[摘要] 采用有限元软件ABAQUS来模拟某双排桩支护深基坑开挖过程，并与实际监测数据对比。分析双排桩-土接触面摩擦系数对基坑变形、桩身弯矩、土压力分布等的影响，分析结果表明：摩擦系数对桩顶水平位移及桩身弯矩存在明显影响，但影响程度有限；摩擦系数对坑内被动区土压力分布影响显著，而对主动区影响并不明显。桩-土界面摩擦系数也是影响基坑变形的重要因素。在实际工程中应采取适当的方法来提高桩-土接触界面特性，利于进一步地控制基坑变形。[关键词] 基坑; 双排桩; 有限元; 接触面; 摩擦系数中图分类号：TU470.3 文献标识码：A 文章编号：1002-848X(2013)S2-0628-05作者简介：余波，硕士研究生， E-mail:yubest09@163.com。Analysis of pile-soil interface characteristics affecting the performance of double-row piles retaining structureYu Bo, Feng Tugen, Xiong Zhonghua(Research Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China)Abstract: The finite element software ABAQUS are used to simulate a double piles deep foundation excavation process, and comparing with the actual monitoring data. Effects of double-row piles-soil interface friction coefficient on pit deformation, bending moment, and the distribution of earth pressure etc are analyzed. The results showed that: the friction coefficient have a significant effect on the top of the pile horizontal displacement and bending moment, but the impact level limites. Passive earth pressure distribution area was significantly affected by friction coefficient, while the active region was not obviously impacted. Piles-soil interface friction coefficient was also an important factor affecting pit deformation. In the actual project, taking appropriate methods to improve the piles-soil contact interface characteristics will further control pit deformation.Key words: deep foundation pit; double-row pile; interface; friction coefficient
