Study on direct shear mechanical characteristics of grouted-filled jointed coal using discrete element method

IF 4.2 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Engineering Analysis with Boundary Elements Pub Date : 2024-11-20 DOI:10.1016/j.enganabound.2024.106048

Xuewei Liu, Weilong Tao, Bin Liu, Sai Wang, Wei Deng, Ying Fan

{"title":"Study on direct shear mechanical characteristics of grouted-filled jointed coal using discrete element method","authors":"Xuewei Liu, Weilong Tao, Bin Liu, Sai Wang, Wei Deng, Ying Fan","doi":"10.1016/j.enganabound.2024.106048","DOIUrl":null,"url":null,"abstract":"Grouting is a widely used technique in underground engineering by enhancing mechanical properties of jointed rock mass. Understanding the shear characteristics of jointed coal mass after grouting reinforcement is crucial for optimizing grouting parameters and advancing grouting mechanism. This study proposed a grout-filled jointed coal (GJC) direct shear discrete element model (GJCS-DEM). The model consists of coal matrix, grout-filled layer, and coal-grout interface. Parallel bond model (PBM) was adopted on intact coal matrix and grout-filled layer, while smooth joint model (SJM) was utilized to model deform behavior of interface in this model. Then, microscopic parameters determination method for SJM in GJCS-DEM has also been introduced and all the parameters for PBM and SJM were calibrated. After that, the proposed approach was validated through the good agreement between strength and failure characteristics of numerical and experimental direct shear test results of specimens with different grouting materials. Finally, the validated GJCS-DEM was applied to investigate effect factors of shear mechanical propertied for GJC specimens. As the grout-filled layer height and joint sawtooth dig angle increases, both peak and residual strength increases, while the failure pattern varies. The work here can offer valuable insights for grouting efficiency improvement in engineering practices.","PeriodicalId":51039,"journal":{"name":"Engineering Analysis with Boundary Elements","volume":"24 1","pages":""},"PeriodicalIF":4.2000,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Engineering Analysis with Boundary Elements","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1016/j.enganabound.2024.106048","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Grouting is a widely used technique in underground engineering by enhancing mechanical properties of jointed rock mass. Understanding the shear characteristics of jointed coal mass after grouting reinforcement is crucial for optimizing grouting parameters and advancing grouting mechanism. This study proposed a grout-filled jointed coal (GJC) direct shear discrete element model (GJCS-DEM). The model consists of coal matrix, grout-filled layer, and coal-grout interface. Parallel bond model (PBM) was adopted on intact coal matrix and grout-filled layer, while smooth joint model (SJM) was utilized to model deform behavior of interface in this model. Then, microscopic parameters determination method for SJM in GJCS-DEM has also been introduced and all the parameters for PBM and SJM were calibrated. After that, the proposed approach was validated through the good agreement between strength and failure characteristics of numerical and experimental direct shear test results of specimens with different grouting materials. Finally, the validated GJCS-DEM was applied to investigate effect factors of shear mechanical propertied for GJC specimens. As the grout-filled layer height and joint sawtooth dig angle increases, both peak and residual strength increases, while the failure pattern varies. The work here can offer valuable insights for grouting efficiency improvement in engineering practices.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

利用离散元素法研究灌浆填充节理煤的直接剪切力学特性

灌浆是地下工程中广泛使用的一种技术，它可以提高节理岩体的机械性能。了解灌浆加固后节理煤块的剪切特性对于优化灌浆参数和推进灌浆机制至关重要。本研究提出了一种灌浆填充节理煤（GJC）直接剪切离散元模型（GJCS-DEM）。该模型由煤基体、灌浆填充层和煤-灌浆界面组成。在该模型中，完整的煤基体和灌浆层采用平行粘结模型（PBM），界面的变形行为采用光滑接缝模型（SJM）。然后，还介绍了 GJCS-DEM 中 SJM 的微观参数确定方法，并校准了 PBM 和 SJM 的所有参数。之后，通过不同灌浆材料试样的直接剪切试验结果，验证了所提出的方法在强度和破坏特征方面与数值试验结果的良好一致性。最后，将经过验证的 GJCS-DEM 应用于研究 GJC 试件的剪切力学性能影响因素。随着灌浆层高度和连接锯齿挖角的增加，峰值强度和残余强度都会增加，而破坏模式则各不相同。这项工作可为工程实践中提高灌浆效率提供有价值的见解。

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

Engineering Analysis with Boundary Elements 工程技术-工程：综合

CiteScore

5.50

自引率

18.20%

发文量

368

审稿时长

56 days

期刊介绍： This journal is specifically dedicated to the dissemination of the latest developments of new engineering analysis techniques using boundary elements and other mesh reduction methods. Boundary element (BEM) and mesh reduction methods (MRM) are very active areas of research with the techniques being applied to solve increasingly complex problems. The journal stresses the importance of these applications as well as their computational aspects, reliability and robustness. The main criteria for publication will be the originality of the work being reported, its potential usefulness and applications of the methods to new fields. In addition to regular issues, the journal publishes a series of special issues dealing with specific areas of current research. The journal has, for many years, provided a channel of communication between academics and industrial researchers working in mesh reduction methods Fields Covered: • Boundary Element Methods (BEM) • Mesh Reduction Methods (MRM) • Meshless Methods • Integral Equations • Applications of BEM/MRM in Engineering • Numerical Methods related to BEM/MRM • Computational Techniques • Combination of Different Methods • Advanced Formulations.