基于分形理论的桩土界面模型试验研究  

Study on Pile-soil Interface Model Tests Based on Fractal Theory

作　　者：武韬 刘建华[3] 郭义 张锐 Wu Tao;Liu Jianhua;Guo Yi;Zhang Rui(China Energy Construction Group Hunan Electric Power Design Institute Co.,Ltd.;Hunan Kechuang Electric Power Engineering Technology Co.,Ltd.;School of Traffic Transportation of Engineering,CSUST)

机构地区：[1]中国能源建设集团湖南省电力设计院有限公司,长沙市410007 [2]湖南科创电力工程技术有限公司,长沙市410007 [3]长沙理工大学交通运输工程学院,长沙市410007

出　　处：《勘察科学技术》2024年第S1期1-5,共5页Site Investigation Science and Technology

摘　　要：桩土接触界面决定了桩的侧摩阻力发挥及承载变形性状。湖区等软土地段,地下水位的变化改变了桩土接触面,并对置于其上的基桩受力产生严重影响。该文在总结前人研究经验的基础上,根据湖区软土地段桥梁基桩的特点,进行了基于相似理论的室内模型试验。模拟桩周地下水位变化过程,通过CT成像技术获取桩土界面的实时细观状态,并结合分形理论得出:分形维数不仅能真实反应桩土界面变化趋势,还能更好地描述变化复杂、强弱程度等微细观差异。The pile-soil contact interface determines the lateral friction resistance and bearing deformation properties of the pile.In soft soil sections such as lake areas,the change of groundwater level changes the pile-soil contact surface,and has a serious impact on the stress of the foundation pile placed on it.Based on the experience of previous researchers,according to the characteristics of bridge foundation piles in the soft soil section of the lake area,this paper carries out indoor model tests based on the similarity theory.The change process of groundwater level around the pile is simulated.The real-time meso-state of the pile soil interface is obtained through CT imaging technology.Combing the fractal theory,it can be concluded that the fractal dimension can not only truly reflect the change trend of the pile soil interface,but also can better describe the changes of the complexity of the degree of the strength of micro and mesoscopic differences.

关 键 词：桩土界面 模型试验 CT技术 分形维数 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]