工程地质学报2023，Vol.31Issue(6)：2115-2124,10.DOI:10.13544/j.cnki.jeg.2021-0629
基于离散元的GFRP筋-水泥土界面黏结特性分析
DISCRETE ELEMENT METHOD-BASED CHARACTERIZATION OF IN-TERFACE BOND BEHAVIOR OF GFRP TENDON EMBEDDED IN CE-MENTED SOILS
摘要
Abstract
The load-bearing performance of the reinforced cement-soil structure depends on the interface bond be-havior of the reinforcement embedded in cement soils.This paper aims to investigate the mobilization mechanism of interface bond strength between the GFRP tendon and cemented soils.The element pullout test of GFRP tendon em-bedded in cement soil is modeled numerically using domestic matrix discrete element software MatDEM.First,the load-displacement curve obtained by the numerical simulation is compared with the experimental results to validate the reliability of the numerical modelling.Second,the evolution of the displacement field of the reinforcement-soil interface,the development of the shear band,and the evolution of the cementation failure are interpreted to charac-terize the interface bond-slip behavior of GFRP tendon embedded in cemented soils from the microscopic view.Last-ly,the impact of rib geometric features on the interface bond-slip behavior is studied in parametric sensitivity analy-sis.The concluded remarks are obtained in this work as follows.(1)The tendons-soil interface experiences shear failure twice in the pullout process of GFRP tendon embedded in cemented soils corresponding to the pullout dis-placement of 4 mm and 10 mum,respectively.(2)The thickness of shear band and the number of particles in shear condition increase along with the development of pullout displacement.But the increasing trend slows down over the increasing interface slip.(3)The cementation failure of particles develops from the interface to the neighboring ce-mented soils radially over the increase of pullout displacement,and in a stagewise trend corresponding to that of the pullout load-displacement response.(4)The magnitude of rib spacing affects the pullout displacement corresponding to each characterizing load.The magnitude of rib height affects the magnitude of each characterizing load.There is an optimal rib height for a constant rib spacing which can mobilize to the largest extent the interface bond strength.The findings in this work can provide insights to the design practice of load-bearing interface for the reinforced ce-ment-soil structures.关键词
水泥土/GFRP筋/离散元/剪切带/界面滑移/参数分析Key words
Cemented soil/GFRP tendon/Discrete element/Shear band/Interface slip/Parametric sensitivity analysis分类
天文与地球科学引用本文复制引用
张根宝,何仕林,陈昌富,徐长节,毛凤山..基于离散元的GFRP筋-水泥土界面黏结特性分析[J].工程地质学报,2023,31(6):2115-2124,10.基金项目
国家杰出青年科学基金项目(资助号:51725802),国家自然科学基金项目(资助号:51878276,51908201,51978254),湖南省自然科学基金项目(资助号:2020JJ5024),长沙市科技项目(资助号:kq2004013).This research is supported by the National Science Fund for Distinguished Young Scholars of China(Grant No.51725802),National Natural Science Foundation of China(Grant Nos.51878276,51908201,51978254),Natural Science Foundation of Hunan Province(Grant No.2020JJ5024)and Science and Technology Plan of Changsha(Grant No.kq2004013). （资助号:51725802）
