Flexural properties and damage evolution laws of scrap tire steel fiber-reinforced constructional backfill body

IF 6.7 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of building engineering Pub Date : 2025-04-16 DOI:10.1016/j.jobe.2025.112700

Chiyuan Che, Shenggen Cao, Yun Zhang, Changzheng Zhao, Shuyu Du, Ruiting Ma, Kaifei Wang, Yang Liu

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引用次数: 0

Abstract

The constructional backfill body (CBB) serves as an underground mining structure intended to form a stable void space within the goaf. However, CBB typically exhibits high brittleness and poor flexural performance. In this study, scrap tire steel fiber (SSF) was utilized to enhance the properties of CBB, and the effects of varying SSF dosages (0 %, 0.5 %, 1 %, and 1.5 %) on the three-point flexural properties and the damage evolution of the scrap tire steel fiber-reinforced constructional backfill body (SSF-reinforced CBB) were investigated. The results indicated that incorporating 1 % SSF significantly enhanced the mechanical properties of CBB. Specifically, the initial cracking flexural strength, peak flexural strength, initial cracking deflection, peak deflection, stiffness, initial cracking toughness and peak toughness of the modified CBB increased by 70.99 %, 55.72 %, 19.05 %, 19.61 %, 104.86 %, 60 %, and 100 %, respectively; the toughness at post-peak load (50 % of the peak load) of increased by 655 % compared to the control group. This indicates that 1 % dosage of SSF optimally enhances damage tolerance in the tested materials. Acoustic emission testing results showed that the incorporation of SSF significantly reduced both the ringing count and the fluctuation amplitude of the b-value during the fracture of the CBB, indicating that the addition of SSF can enhance the crack-resisting capabilities of the CBB. However, incorporating excessive SSF may lead to the formation of weak structural planes within the SSF-reinforced CBB, thereby reducing its flexural performance and damage resistance. Therefore, the optimal dosage of SSF in engineering applications is recommended to be 1 %.

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废轮胎钢纤维增强结构回填体抗弯性能及损伤演化规律

构造充填体是一种地下采矿结构，目的是在采空区内形成稳定的空隙空间。然而，CBB通常表现出高脆性和较差的弯曲性能。研究了废轮胎钢纤维（SSF）对废轮胎钢纤维增强结构回填体（SSF-增强CBB）三点弯曲性能和损伤演化的影响，研究了SSF添加量（0%、0.5%、1%和1.5%）对回填体三点弯曲性能的影响。结果表明，掺入1% SSF可显著提高CBB的力学性能。其中，改性CBB的初始开裂抗弯强度、峰值抗弯强度、初始开裂挠度、峰值挠度、刚度、初始开裂韧性和峰值韧性分别提高了70.99%、55.72%、19.05%、19.61%、104.86%、60%和100%；峰后负荷（峰值负荷的50%）下的韧性比对照组提高了655%。这表明，在测试材料中，1%的SSF用量最优地提高了损伤容限。声发射测试结果表明，SSF的加入显著降低了CBB断裂时的振铃数和b值波动幅度，表明SSF的加入可以增强CBB的抗裂能力。然而，加入过多的SSF可能导致SSF增强CBB内部形成薄弱的结构面，从而降低其抗弯性能和抗损伤能力。因此，在工程应用中，推荐SSF的最佳用量为1%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of building engineering Engineering-Civil and Structural Engineering

CiteScore

10.00

自引率

12.50%

发文量

1901

审稿时长

35 days

期刊介绍： The Journal of Building Engineering is an interdisciplinary journal that covers all aspects of science and technology concerned with the whole life cycle of the built environment; from the design phase through to construction, operation, performance, maintenance and its deterioration.