考虑粗糙度影响的黏性土-混凝土界面剪切特性室内试验研究  

Study on shear characteristics of clay-concrete interface by considering

作　　者：王永洪[1,2] 王鑫 李世强 张腾 王军 张传通 李勇 WANG Yonghong;WANG Xin;LI Shiqiang;ZHANG Teng;WANG Jun;ZHANG Chuantong;LI Yong(School of Civil Engineering,Qingdao Technological University,Qingdao Shandong 266033;Collaborative Innovation Center for Engineering Construction and Safety of Blue Economic Zone,Qingdao Shandong 266033;China State Construction Zhongxin Construction Engineering Co.,Ltd,Qingdao Shandong 266109)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033 [2]山东省高等学校蓝色经济区工程建设与安全协同创新中心,山东青岛266033 [3]中建中新建设工程有限公司,山东青岛266109

出　　处：《首都师范大学学报（自然科学版）》2023年第4期18-24,共7页Journal of Capital Normal University：Natural Science Edition

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：采用大型恒刚度桩-土界面直剪试验系统,对不同界面粗糙度条件下,施加不同法向应力,进行黏性土-混凝土桩-土界面直剪试验,分析界面抗剪强度及其参数(界面附着力、界面摩擦角),界面剪切破坏位移和界面剪切刚度。结果表明:随着混凝土表面粗糙度的增大,界面抗剪强度、界面摩擦角、界面剪切刚度系数和界面残余剪切应力均呈增大趋势,最大增幅达35.80%;而界面附着力随粗糙度的增大呈先减小后增大的趋势,增大幅度达23.70%。因此,桩-土界面的力学特性受粗糙度的影响,试验结果可为静压桩的工程实践提供借鉴与参考。Using the large-scale constant stiffness pile-soil interface direct shear test system,the direct shear test of cohesive soil-concrete pile-soil interface was carried out by applying different normal stresses under different interface roughness levels.The interface shear strength and its parameters(interface adhesion,interface friction angle),interface shear failure displacement and interface shear stiffness are analyzed.The results show that the interface shear strength,interface friction angle,interface shear stiffness coefficient and interface residual shear stress all increase with the increase of the surface roughness of concrete,with the maximum increase of 35.80%.However,the interface adhesion first decreases and then increases with the increase of roughness,with an increase of 23.70%.Therefore,the mechanical properties of the pile-soil interface are affected by the roughness,and the test results can provide reference for the engineering practice of static pressure piles.

关 键 词：粉质黏土-混凝土 粗糙度 桩-土界面 抗剪强度特性 

分 类 号：TU473[建筑科学—结构工程]