钙质砂-蛇皮仿生界面循环剪切特性研究  

Cyclic shearing characteristics of calcareous sand-snake skin-inspired interfaces

作　　者：崔昊 刘汉龙[2,3] 肖杨[2,3] CUI Hao;LIU Hanlong;XIAO Yang(College of Optoelectronic Engineering,Chongqing University,Chongqing 400045,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学光电工程学院,重庆400045 [2]重庆大学土木工程学院,重庆400045 [3]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045

出　　处：《岩土工程学报》2025年第5期1014-1024,共11页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(52078085,52378325)。

摘　　要：钙质砂与结构物界面的动力响应对海洋岩土工程中构筑物的整体稳定性具有重要意义。蛇皮仿生界面是基于蛇腹部鳞片的几何非对称性发展起来的新型界面形式,因其在剪切时表现出的摩擦各向异性而受到研究者关注。基于界面直剪仪,开展了一系列钙质砂-蛇皮仿生界面循环剪切试验,探究了法向应力、剪切位移幅值以及界面表观形态对界面循环剪切刚度、阻尼比的影响。试验结果表明:法向应力增加导致界面剪切刚度增加,阻尼比降低;剪切刚度随剪切位移增加而降低,阻尼比则增加;鳞片几何特征比增加会使剪切刚度降低,阻尼比增加。此外,相同鳞片几何特征比下剪切刚度随鳞片高度增加而增加,阻尼比则降低。数据拟合表明:剪切刚度和阻尼比与法向应力分别呈线性关系和对数关系,与剪切位移幅值分别呈反比例关系和对数关系,与鳞片几何特征比都呈幂函数关系。研究成果将为蛇皮仿生界面在海洋抗拔桩的应用提供重要的理论基础。In marine geotechnical engineering,the dynamic response of the calcareous sand-structure interfaces is critical to the overall stability of structures.The snake skin-inspired interface is a new type of interface developed based on the geometric asymmetry of the ventral scales of snakes,which has attracted the attention of researchers due to the frictional anisotropy during shearing.Based on the direct shear apparatus for interface,a series of cyclic shear tests are carried out on the interfaces between calcareous sand and snake skin-inspired steel surfaces.The effects of normal stress,cyclic amplitude and apparent interface shape on the shear stiffness and damping ratio are investigated.The test results show that increasing the normal stress increases the shear stiffness of interface and decreases the damping ratio.Increasing the cyclic amplitude leads to a decrease in the shear stiffness and an increase in the damping ratio.The shear stiffness decreases with the increase in the scale geometric ratio,while the damping ratio shows the opposite trend.In addition,for the same scale geometric ratio,the shear stiffness increases with the increase in scale height,while the damping ratio decreases.The data fitting results show that the shear stiffness and damping ratio have a linear and logarithmic relationship with the normal stress,respectively.The shear stiffness and damping ratio have an inverse reduction and logarithmic relationship with the shear displacement amplitude,respectively.The power function can represent the relationship between the shear stiffness and the scale geometric ratio,as well as the relationship between the damping ratio and scale geometric ratio.The research results in this study will provide an important theoretical basis for the application of snake skin-inspired interfaces in marine uplift piles.

关 键 词：钙质砂 蛇皮仿生界面 循环剪切 剪切刚度 阻尼比 

分 类 号：TU441[建筑科学—岩土工程]