Experimental and DEM analyses of type I fracture characteristics of waste rock aggregate reinforced cemented tailing backfill

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL Theoretical and Applied Fracture Mechanics Pub Date : 2024-11-19 DOI:10.1016/j.tafmec.2024.104764

Tianyu Zhu , Zhonghui Chen , Zhongyu Wang , Jian Cao , Jianshuai Hao , Zihan Zhou

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Abstract

In the downward filling mining method, the fracture of the roof of the filling body with cracks will seriously endanger the lives of the workers. In this study, uniaxial compression tests, splitting tensile tests and three-point bending fracture tests were performed on cemented waste rock tailing backfill (CWTB) with prefabricated notches, and the effect of waste rock aggregate content (10%, 20%, 30%, 40%, and 50%) on the basic mechanical parameters and fracture characteristics of the CWTB was analyzed in conjunction with digital image correlation (DIC) techniques. The safety warning parameter before the unstable fracture of CWTB was proposed. The toughening mechanism of aggregates was revealed. The results show that the incorporation of waste rock aggregate significantly improves the strength, fracture toughness, and fracture energy of CWTB. The multiple toughening mechanisms of waste rock aggregate synergistically improve the crack resistance of CWTB and prolong the time between initiation of cracking and unstable fracture. The content of waste rock aggregate changes the failure modes and crack extension paths of CWTB. Meanwhile, microscopic damage mechanism of CWTB was explored using PFC3D. The simulation results show that compared with cemented tailing backfill (CTB), aggregate-induced crack bifurcation and deflection effects increased the number of microcracks in CWTB, reduce the rate of microcracks in the stable extension period, and make its fracture surface rougher and more tortuous.

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废石骨料加固水泥尾矿回填土 I 型断裂特性的实验和 DEM 分析

在下向充填采矿法中，充填体顶板裂缝断裂将严重危及工人的生命安全。本研究对预制槽口的胶结废石尾矿回填体（CWTB）进行了单轴压缩试验、劈裂拉伸试验和三点弯曲断裂试验，并结合数字图像相关（DIC）技术分析了废石骨料含量（10%、20%、30%、40%和50%）对CWTB基本力学参数和断裂特性的影响。提出了 CWTB 不稳定断裂前的安全预警参数。揭示了聚集体的增韧机理。结果表明，掺入废石骨料可显著提高 CWTB 的强度、断裂韧性和断裂能。废石骨料的多种增韧机制协同提高了 CWTB 的抗裂性能，延长了从开裂到不稳定断裂之间的时间。废石骨料的含量改变了 CWTB 的破坏模式和裂纹扩展路径。同时，利用 PFC3D 对 CWTB 的微观破坏机理进行了探讨。模拟结果表明，与固结尾矿回填（CTB）相比，骨料诱发的裂缝分叉和挠曲效应增加了 CWTB 的微裂缝数量，降低了稳定扩展期的微裂缝速率，并使其断裂面更加粗糙和曲折。

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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.