基于双界面滑移耦合的水泥土锚杆荷载传递模型  

Load-transfer model of soil mixing anchors based on coupled dual-interface slips

作　　者：张根宝 陈昌富[3] 徐长节 陈海军 ZHANG Genbao;CHEN Changfu;XU Changjie;CHEN Haijun(College of Civil Engineering,Hunan City University,Yiyang 413000,Hunan,P.R.China;Hunan Engineering Research Center for Structural Safety and Disaster Prevention of Urban Underground Infrastructure,Hunan City University,Yiyang 413000,Hunan,P.R.China;College of Civil Engineering,Hunan University,Changsha 410082,P.R.China;Jiangxi Engineering Research Centre for Development of Underground Space Technology,Nanchang 330013,P.R.China)

机构地区：[1]湖南城市学院土木工程学院,湖南益阳413000 [2]湖南城市学院城市地下基础设施结构安全与防灾湖南省工程研究中心,湖南益阳413000 [3]湖南大学土木工程学院,长沙410082 [4]江西省地下空间技术开发工程研究中心,南昌330013

出　　处：《土木与环境工程学报（中英文）》2023年第1期79-88,共10页Journal of Civil and Environmental Engineering

基　　金：国家自然科学基金(51725802、51908201);湖南自然科学基金(2020JJ5024);长沙市科技项目(kq2004013)。

摘　　要：水泥土锚杆的承载过程伴随筋体—黏结体界面和黏结体—岩土体界面的黏结强度调动,界面剪应力的径向传播机制受到不同界面附近材料的应力和变形条件影响,对水泥土锚杆进行荷载传递分析需考虑双界面的剪切变形耦合。结合锚杆受力变形分析常用的荷载传递法和剪切位移法,将二者分别用于界面剪应力在锚杆轴向和径向引起的变形分析计算,考虑锚杆双界面的剪应力与剪切变形耦合,建立基于界面特性测试的水泥土锚杆双界面滑移耦合荷载传递分析模型。通过水泥土的材料性质试验及单元体尺度和模型试验尺度的水泥土锚杆拉拔试验,获得了模型的计算参数取值,并验证了模型对锚杆拉拔响应的预测能力。The load-transfer modelling of soil mixing anchor is regarded as taking the coupling of dual-interface slip into account.It is essentially caused by the mobilization of bond strength for both the reinforcement-binder and the binder-matrix interfaces,and the impact of stress and strain conditions of materials adjacent to the interfaces on the propagation of interface shear stress.A recently developed load-transfer modelling framework of soil mixing anchor accounting for coupling of dual-interface slips was presented in this work based on interface characterization.This framework was established by integrating load-transfer method and shear displacement method,conventionally used in anchor behavior analysis,to solve for the straining of soil mixing anchor induced by interface shear stress in axial and radial directions,respectively.Laboratory testing including mechanical characterization of cemented soils,pullout tests on soil mixing anchor using elementary specimen and model specimen were carried out to calibrate the parameters in modeling and to validate the predictive capability for the pullout response of the presented modelling framework.

关 键 词：水泥土锚杆 双界面 单元体试样 剪切变形 荷载传递分析 

分 类 号：TU476[建筑科学—结构工程]