Experimental study on anchorage mechanical effect of rock bolts on cross-jointed rock mass using DIC and AE

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL Theoretical and Applied Fracture Mechanics Pub Date : 2025-06-01 Epub Date: 2025-02-11 DOI:10.1016/j.tafmec.2025.104875

Fei Xue , Zhuoya Tong , Wei Chen , Tianzuo Wang , Xiaobo You , Zhongqin Lin

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Abstract

Rock bolting is a commonly used reinforcement technique for jointed rock masses. This study investigates the anchorage effects of rock bolts on cross-jointed rock masses. Novel 3D-printed stainless steel bolts were used to reinforce rock-like specimens with main joint angles of 15°, 30°, 45°, 60°, and 75°. The integration of Acoustic Emission (AE) and Digital Image Correlation (DIC) techniques enabled comprehensive monitoring of crack propagation and strain evolution. The results show that bolt reinforcement significantly enhanced specimen strength (up to 79.9 %) and elastic modulus (up to 37.9 %) at smaller joint angles (≤45°). However, the reinforcement effectiveness diminished considerably at larger angles (≥60°), with strength reductions of up to 10.6 %. The combined AE-DIC analysis revealed distinct failure mechanisms: tensile-dominated failure at small joint angles and shear-dominated failure at larger joint angles. This study provides practical guidelines for optimizing rock bolt applications in jointed rock masses, particularly highlighting the need for alternative support strategies at large joint angles.

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基于DIC和AE的岩体锚杆锚固力学效应试验研究

锚杆支护是节理岩体常用的一种加固技术。研究了锚杆在交叉节理岩体中的锚固作用。采用新型3d打印不锈钢螺栓加固类岩石试件，主连接角分别为15°、30°、45°、60°和75°。声发射（AE）和数字图像相关（DIC）技术的集成实现了对裂纹扩展和应变演化的全面监测。结果表明：在较小的连接角（≤45°）下，锚杆加固可显著提高试件强度（79.9%）和弹性模量（37.9%）；然而，在较大的角度（≥60°）下，加固效果明显下降，强度降低高达10.6%。AE-DIC联合分析揭示了不同的破坏机制：小节理角处以拉伸为主破坏，大节理角处以剪切为主破坏。该研究为优化锚杆在节理岩体中的应用提供了实用指南，特别强调了在大节理角度下替代支护策略的必要性。

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.