基坑开挖对邻近双桩基础影响的试验与模拟  

Experiment and Simulation of the Influence of Foundation Pit Excavation on Adjacent Double Pile Foundation

作　　者：戴志峰 陈颖辉[2] DAI Zhifeng;CHEN Yinghui(Changjiang Institute Of Technology,Wuhan 430212,Hubei,China;Kunming University of Science and Technology,Kunming 650500,Yunnan,China)

机构地区：[1]长江工程职业技术学院,湖北武汉430212 [2]昆明理工大学,云南昆明650500

出　　处：《长江工程职业技术学院学报》2024年第3期1-5,15,共6页Journal of Changjiang Institute of Technology

摘　　要：为了研究悬臂式支护结构基坑开挖对邻近双桩的影响,进行了室内模型试验,对邻近双桩的附加应力及附加变形进行分析,并开展了不同影响因素下的数值模拟研究。结果表明,随着基坑开挖深度的增大,桩基附加应力及附加变形均出现增大趋势,同时前桩所受影响大于后桩。进一步数值模拟中得出桩基附加应力及变形随粘聚力及支护刚度变化规律:粘聚力在8kPa内增加时,桩身弯矩、水平位移呈减小趋势,粘聚力超过8kPa后减势均明显趋缓;支护刚度的增大对减小桩身弯矩有一定效果,但不够显著,对于减小桩身水平位移效果明显。In order to study the influence of foundation pit excavation of cantilever support structure on adjacent double piles,indoor model test was carried out,the additional stress and additional deformation of adjacent double piles were analyzed,and numerical simulation research under different influencing factors was carried out.The results show that with the increase of foundation pit excavation depth,the additional stress and additional deformation of pile foundation both show an increasing trend,and the front pile is more affected than the rear pile.Further numerical simulation shows that the additional stress and deformation of pile foundation change with cohesion and support stiffness:when cohesion increases within 8kPa,the bending moment and horizontal displacement of pile body show a decreasing trend,and the reduction trend slows down significantly after cohesion exceeds 8kPa;the increase of support stiffness has a certain effect on reducing the bending moment of pile body,but it is not significant enough,and it has a significant effect on reducing the horizontal displacement of pile body.

关 键 词：模型试验 附加应力 附加变形 数值模拟 

分 类 号：TU473[建筑科学—结构工程]