黏性土-混凝土界面抗剪及残余强度试验研究  

EXPERIMENTAL STUDY ON THE SHEAR RESISTANCE AND RESIDUAL STRENGTH OF COHESIVE SOIL-CONCRETE INTERFACE

作　　者：张硕 王永洪[1] 武洪志 王春光 刘龙海 孙连杰 王东雷 ZHANG Shuo;WANG Yonghong;WU Hongzhi;WANG Chunguang;LIU Longhai;SUN Lianje;WANG Donglei(School of Civil Engineering,Qingdao Technological University,Shandong Qingdao 266033,China;Shandong Hi-Speed Engineering Construction Group Co.,Ltd.,Jinan 250014,China;Yantai Highway Development Center,Shandong Yantai,264001,China;Qingdao Yongyuan Marine Technology Co.,Ltd.,Shandong Qingdao 266033,China;Qingdao Green Technology Geotechnical Engineering Co.,Ltd.,Shandong Qingdao 266033,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033 [2]山东高速工程建设集团有限公司,济南250014 [3]烟台市公路事业发展中心,山东烟台264001 [4]青岛永元海洋科技有限公司,山东青岛266033 [5]青岛绿色理工岩土工程有限公司,山东青岛266033

出　　处：《低温建筑技术》2024年第6期44-47,共4页Low Temperature Architecture Technology

基　　金：国家重点研发计划项目(2021YFE0113400);山东省自然科学基金面上项目(ZR2022ME143)。

摘　　要：文中采用自制的大型试验系统,通过直剪试验对粉质黏土-混凝土界面在不同粗糙度条件下的剪切特性展开研究,探明预制桩桩-土界面的力学参数与粗糙度之间的关系。结果表明粗糙度是预制桩桩-土界面的剪切强度和剪切刚度等力学性质的重要影响因素。界面抗剪强度、界面摩擦角、界面附着力、界面剪切刚度和界面剪切破坏位移等力学参数均随着混凝土表面粗糙度的增大而增大,其中剪切破坏位移增幅较为显著,最大增幅达55%;界面附着力随粗糙度增大呈先减小后增大的趋势,最大增幅23.7%。试验结果对静压桩的工程实践具有重要意义。In order to explore the relationship between the mechanical parameters of the precast pile-soil interface and the roughness,this study analyzed the shear characteristics of the pulverized clay-concrete interface under dif-ferent roughness conditions by direct shear test using a home-made large-scale test system.The results show that the interfacial shear strength,interfacial friction angle,interfacial adhesion,interfacial shear stiffness,and interfa-cial shear displacements increase with the increase of concrete surface roughness,among which the increase of shear displacements is more significant,with a maximum increase of 55%;the interfacial adhesion decreases and then in-creases with the increase of roughness,with a maximum increase of 23.7%.The results of the study are of great sig-nificance to the engineering practice of hydrostatic piles.

关 键 词：桩-土界面 粗糙度 粉质黏土 界面剪切特性 

分 类 号：TU473.13[建筑科学—结构工程]