Micromechanical model for simulating load transfer behavior and damage evolution for fully grouted rockbolt under axial loads

IF 7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL International Journal of Rock Mechanics and Mining Sciences Pub Date : 2024-11-26 DOI:10.1016/j.ijrmms.2024.105971
Kai Guan , Xu Jiang , Wancheng Zhu , Wenjun Luo , Hongping Li , Bowang Li
{"title":"Micromechanical model for simulating load transfer behavior and damage evolution for fully grouted rockbolt under axial loads","authors":"Kai Guan ,&nbsp;Xu Jiang ,&nbsp;Wancheng Zhu ,&nbsp;Wenjun Luo ,&nbsp;Hongping Li ,&nbsp;Bowang Li","doi":"10.1016/j.ijrmms.2024.105971","DOIUrl":null,"url":null,"abstract":"<div><div>In the present paper the problems of the nonlinear debonding of anchorage interface, the strain-hardening and rupture of rockbolt, and the progressive damage of heterogeneous rock for the fully grouted rockbolt under axial loads are studied. A micromechanical numerical model is developed and implemented into the finite difference programme, to analyze the load transfer mechanism and damage evolution by introducing the bi-exponential shear slip model of interface, bilinear strain-hardening model of rockbolt and elastic damage model of rock. The close agreement between the simulation results of the proposed model and the theoretical and experimental data validates the model's capability for accurately characterizing the pull-out behavior of the grouted rockbolt. Failure type strongly depends on the strength of rock and anchorage interface, as well as the anchorage length. In particular, when rock strength is low, strain energy is predominantly dissipated through rock damage, leading to the interface failing to fully mobilize its load transfer effect, especially at a relatively long anchorage length. Moreover, the excessive interfacial adhesion performance causes a large range of serious damage in rock near the interface and leads to peak pull-out load even lower than the rockbolt with poor interfacial bonding properties. Finally, the critical anchorage length is investigated and the load transfer mechanism of the fully grouted rockbolt is clarified by comparing the case with or without rock damage. It is therefore very useful of the developed micromechanical model, since it provides an essential understanding of the load transferring capacity and failure type of the fully grouted rockbolt, especially under rock damage.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"185 ","pages":"Article 105971"},"PeriodicalIF":7.0000,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Rock Mechanics and Mining Sciences","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1365160924003368","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, GEOLOGICAL","Score":null,"Total":0}
引用次数: 0

Abstract

In the present paper the problems of the nonlinear debonding of anchorage interface, the strain-hardening and rupture of rockbolt, and the progressive damage of heterogeneous rock for the fully grouted rockbolt under axial loads are studied. A micromechanical numerical model is developed and implemented into the finite difference programme, to analyze the load transfer mechanism and damage evolution by introducing the bi-exponential shear slip model of interface, bilinear strain-hardening model of rockbolt and elastic damage model of rock. The close agreement between the simulation results of the proposed model and the theoretical and experimental data validates the model's capability for accurately characterizing the pull-out behavior of the grouted rockbolt. Failure type strongly depends on the strength of rock and anchorage interface, as well as the anchorage length. In particular, when rock strength is low, strain energy is predominantly dissipated through rock damage, leading to the interface failing to fully mobilize its load transfer effect, especially at a relatively long anchorage length. Moreover, the excessive interfacial adhesion performance causes a large range of serious damage in rock near the interface and leads to peak pull-out load even lower than the rockbolt with poor interfacial bonding properties. Finally, the critical anchorage length is investigated and the load transfer mechanism of the fully grouted rockbolt is clarified by comparing the case with or without rock damage. It is therefore very useful of the developed micromechanical model, since it provides an essential understanding of the load transferring capacity and failure type of the fully grouted rockbolt, especially under rock damage.
查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
模拟轴向荷载下全灌浆岩螺栓荷载传递行为和损伤演变的微观力学模型
本文研究了全灌浆锚杆在轴向荷载作用下,锚固界面的非线性剥离、锚杆的应变硬化和断裂以及异质岩石的渐进破坏问题。通过引入界面的双指数剪切滑移模型、锚杆的双线性应变硬化模型和岩石的弹性破坏模型,建立了微观力学数值模型,并将其应用于有限差分程序,以分析荷载传递机制和破坏演化过程。提出的模型模拟结果与理论和实验数据非常接近,验证了该模型能够准确描述灌浆锚杆的拉拔行为。破坏类型与岩石和锚固界面的强度以及锚固长度密切相关。特别是当岩石强度较低时,应变能主要通过岩石破坏耗散,导致界面无法充分发挥其荷载传递作用,尤其是在锚固长度相对较长的情况下。此外,过高的界面粘结性能会导致界面附近的岩石出现大范围的严重破坏,并导致峰值拉拔载荷甚至低于界面粘结性能较差的锚杆。最后,研究了临界锚固长度,并通过比较有无岩石破坏的情况,阐明了全灌浆锚杆的荷载传递机制。因此,所开发的微观力学模型非常有用,因为它提供了对全灌浆锚杆荷载传递能力和破坏类型的基本理解,尤其是在岩石破坏的情况下。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
CiteScore
14.00
自引率
5.60%
发文量
196
审稿时长
18 weeks
期刊介绍: The International Journal of Rock Mechanics and Mining Sciences focuses on original research, new developments, site measurements, and case studies within the fields of rock mechanics and rock engineering. Serving as an international platform, it showcases high-quality papers addressing rock mechanics and the application of its principles and techniques in mining and civil engineering projects situated on or within rock masses. These projects encompass a wide range, including slopes, open-pit mines, quarries, shafts, tunnels, caverns, underground mines, metro systems, dams, hydro-electric stations, geothermal energy, petroleum engineering, and radioactive waste disposal. The journal welcomes submissions on various topics, with particular interest in theoretical advancements, analytical and numerical methods, rock testing, site investigation, and case studies.
期刊最新文献
Experimental analysis of rock mass transport during dolomite and gas outburst Semi-Automated rock block volume extraction from high-resolution 3D point clouds for enhanced rockfall hazard analysis Evaluation of ring test with reference to deformation rate and specimen geometry in assessing the tensile behaviors of granite Micromechanical model for simulating load transfer behavior and damage evolution for fully grouted rockbolt under axial loads Experimental study and model improvement on coal permeability: The influence of effective stress, slip effect, and water content
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1