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

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-02-20 DOI:10.1002/nag.3964

Zixin Wang, Jun Peng, Chuanhua Xu, Linfei Wang, Bibo Dai

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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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孔径对非持久节理剪切行为的影响：基于颗粒模型的见解

节理作为岩石材料中常见的一种结构或缺陷，在地质力学和岩土工程领域中占有重要地位。岩石的剪切变形、强度和破坏行为受节理的排列、持续、倾角和长度等结构特性的显著影响。本文采用考虑长石形状的改进晶粒模型（GBM），对具有不同节理持久性和节理孔径的二维节理岩体在不同法向应力作用下的抗剪强度和变形行为以及相关的微开裂过程进行了数值研究。结果表明：节理持久性和正应力对岩石抗剪强度和微裂行为的影响大于节理孔径；其中，裂缝起裂应力（CIS）受节理孔径的影响不大，直剪强度（DSS）和剪切模量(G)随节理孔径的增大而略有降低。在初始加载阶段，微裂纹主要在岩桥两端和中心发育。数值模型竖向应力定量分析结果表明，节理持久性越高，正应力越低，应力分布越均匀。通过宏观和细观受力分析，从理论上解释了节理孔径、节理持久性和正应力对岩石剪切力学行为和微裂机理的影响。

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来源期刊

International Journal for Numerical and Analytical Methods in Geomechanics 工程技术-材料科学：综合

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.