Shear failure and strength upscaling characterization of block-in-matrix geomaterials through the bim cell

IF 3.7 2区 工程技术 Q3 ENGINEERING, ENVIRONMENTAL
Minghui Ren, Hai Pu, Guangsi Zhao, Runhua Zhang, Qian Yin
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引用次数: 0

Abstract

The coupled effects of heterogeneous composition and block structure make it challenging to establish a generalized mechanical model for block-in-matrix (bim) geomaterials. In this study, the bim cell is introduced as a new unit to investigate the mechanical coupling behaviors of cohesive bim geomaterials. First, the structural features and experimental preparation of the bim cell are outlined, and the shear mechanical properties and failure surface of the bim cell were obtained through direct shear tests and laser scanning experiments. Additionally, a three-dimensional discrete element model of the bim cell was precisely constructed and calibrated to replicate the meso-failure process, and was applied in numerical tests of bim cells with varying block sizes. Based on experimental and numerical results, it was demonstrated that the mechanical behavior of the rock block is akin to the existence of a structural interface within the matrix, which significantly controll both the peak and residual strength mechanism. In the peak state, the mechanical effects of the block are primarily controlled by the block-matrix interface properties. Whereas in the residual state, the structural effects of the block gradually become prominent in the irregularity of shear-induced slip. Finally, the strength coupling law of the components has been discussed based on the construction of a mechanical unit. The core contribution of this paper lies in emphasizing the differences in the failure mechanisms of the bim geomaterials under different shear deformations, providing a solid meso-mechanical basis for the development of peak and residual strength models.

基于bim细胞的块状基质岩土材料剪切破坏及强度升级特性研究
非均质成分与块体结构的耦合作用,使得块体材料广义力学模型的建立具有挑战性。在本研究中,引入bim单元作为一个新的单元来研究黏性bim岩土材料的力学耦合行为。首先概述了bim电池的结构特点和实验制备,并通过直剪试验和激光扫描实验获得了bim电池的剪切力学性能和破坏面。此外,还精确构建和校准了bim细胞的三维离散单元模型,以复制细观破坏过程,并将其应用于不同块大小的bim细胞的数值测试。实验和数值结果表明,岩体的力学行为类似于在基体内部存在一个结构界面,该界面对峰值强度和残余强度机制都有显著的控制作用。在峰值状态下,块体的力学效应主要由块体-基体界面特性控制。而在残余状态下,块体的结构效应逐渐凸显,剪切诱发滑移的不规则性逐渐显现。最后,结合某机械单元的结构,讨论了各部件的强度耦合规律。本文的核心贡献在于强调了bim岩土材料在不同剪切变形下破坏机制的差异,为峰值和残余强度模型的发展提供了坚实的细观力学基础。
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来源期刊
Bulletin of Engineering Geology and the Environment
Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合
CiteScore
7.10
自引率
11.90%
发文量
445
审稿时长
4.1 months
期刊介绍: Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.
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