近海黏性土中桩土界面剪切特性与含水率效应  

Effects of Water Contentand Shear Properties on Pile-soil Interface of Offshore Cohesive Soil

作　　者：王永洪[1] 王鑫 张明义[1] 李长河 王东雷 Wang Yonghong;Wang Xin;Zhang Mingyi;Li Changhe;Wang Donglei(School of Civil Engineering,Qingdao University of Technology,Qingdao,Shandong 266020,P.R.China;School of Mechanical and Automotive Engineering,Qingdao University of Technology,Qingdao,Shandong 266020,P.R.China;Qingdao Yongyuan Marine Technology Co.,Ltd.,Qingdao,Shandong 266033,P.R.China;Qingdao Green Technology Geotechnical Engineering Co.,Ltd.,Qingdao,Shandong 266033,P.R.China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266520 [2]青岛理工大学机械与汽车工程学院,山东青岛266520 [3]青岛永元海洋科技有限公司,山东青岛266533 [4]青岛绿色理工岩土工程有限公司,山东青岛266533

出　　处：《地下空间与工程学报》2024年第4期1236-1246,共11页Chinese Journal of Underground Space and Engineering

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

摘　　要：为了研究粉质黏土-混凝土截面的抗剪强度在不同物理条件下的影响特征,本文针对粗糙度、含水率对其的影响展开研究,根据前人经验总结自制出了型直剪试验仪,研究了混凝土在不同粗糙度以及不同含水率的条件下,粉质黏土-混凝土界面的剪切特性受到的物理影响。结果表明:混凝土表明粗糙度对试验结果产生直接影响,并且随着粗糙度的增大,界面抗剪强度、界面摩擦角、剪切刚度系数以及界面残余剪切应力均相应增大,最大增幅可达37.0;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23.7%。随着黏性土含水率的增大,界面抗剪强度、剪切刚度系数和界面残余剪切应力均呈先增大后减小趋势,含水率在20%~28%之间存在一个最优含水率使得界面抗剪特性最优;粉质黏土-混凝土界面的抗剪强度受粗糙度和含水率的影响较大。试验结果可为静压桩的工程实践提供借鉴与参考。In order to study the effects of roughness,water content on the shear strength characteristics of silty clay-concrete interface,a large direct shear test system was developed to study the shear characteristics of silty clay-concrete interface under different roughness,water content.The results showed that the interface shear strength,interface friction angle,shear stiffness coefficient and interface residual shear stress all increase with the increase of the surface roughness of concrete,with a maximum increase of 37.0%.However,with the increase of roughness,the interface adhesion first decreases and then increases,with an increase of 23.7%.With the increase of the water content of cohesive soil,the interface shear strength,shear stiffness coefficient and residual shear stress at the interface all increase first and then decrease.There is an optimal water content between 20% and 28%,which makes the interface shear characteristics optimal.Roughness and water content have significant effects on the shear strength of silty clay-concrete interface.The test results can provide reference for the engineering practice of jacked pile.

关 键 词：粉质黏土-混凝土 粗糙度 含水率 抗剪强度特性 

分 类 号：TU473[建筑科学—结构工程]