Influence of Aperture on Shear Behavior of Non‐Persistent Joint: Insights from Grain‐Based Modeling

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL
Zixin Wang, Jun Peng, Chuanhua Xu, Linfei Wang, Bibo Dai
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引用次数: 0

Abstract

In the field of geomechanics and geotechnical engineering, joint is crucial as a common structure or flaw in rock material. The shear deformation, strength, and failure behavior of rock are significantly influenced by the structural properties of joints, which include arrangement, persistency, dip angle, and length. The shear strength and deformation behavior, as well as the related micro‐cracking process of a collection of 2D jointed rock masses with varying joint persistency and joint apertures under various normal stresses, are numerically investigated in this study using an improved grain‐based model (GBM) considering feldspar shape. The results show that joint persistency and normal stress have a larger influence on the shear strength and micro‐cracking behavior of rock when compared with joint aperture. In particular, the crack initiation stress (CIS) is not greatly affected by joint aperture, while the direct shear strength (DSS) and the shear modulus (G) slightly decrease with the increase of joint aperture. The developed micro‐cracks initiate primarily at both ends and the center of the rock bridge at the initial loading stage. The results from quantitative analysis of vertical stress of the numerical model reveal that higher joint persistency and lower normal stress result in a more uniform stress distribution. The influence of joint aperture, joint persistency, and normal stress on shear mechanical behavior and the micro‐cracking mechanism of rock is theoretically explained through macroscopic and microscopic force analysis.
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来源期刊
CiteScore
6.40
自引率
12.50%
发文量
160
审稿时长
9 months
期刊介绍: The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.
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