Mechanical properties and damage evolution characteristics of waste tire steel fiber-modified cemented paste backfill

IF 11.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology Pub Date : 2024-07-01 DOI:10.1016/j.ijmst.2024.07.007

Shenggen Cao , Chiyuan Che , Yun Zhang , Changhao Shan , Yang Liu , Changzheng Zhao , Shuyu Du

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引用次数: 0

Abstract

During the process of constructional backfill mining, the cemented paste backfill (CPB) typically exhibits a high degree of brittleness and limited resistance to failure. In this study, the mechanical and damage evolution characteristics of waste tire steel fiber (WTSF)-modified CPB were studied through uniaxial compression tests, acoustic emission (AE) tests, and scanning electron microscopy (SEM). The results showed that the uniaxial compressive strength (UCS) decreased when the WTSF content was 0.5%, 1%, and 1.5%. When the WTSF content reached 1%, the UCS of the modified CPB exhibited a minimal decrease (0.37 MPa) compared to that without WTSF. When the WTSF content was 0.5%, 1%, and 1.5%, peak strain of the WTSF-modified CPB increased by 18%, 31.33%, and 81.33%, while the elastic modulus decreased by 21.31%, 26.21%, and 45.42%, respectively. The addition of WTSF enhances the activity of AE events in the modified CPB, resulting in a slower progression of the entire failure process. After the failure, the modified CPB retained a certain level of load-bearing capacity. Generally, the failure of the CPB was dominated by tensile cracks. After the addition of WTSF, a gradual increase in the proportion of tensile cracks was observed upon loading the modified CPB sample to the pore compaction stage. The three-dimensional localization of AE events showed that the WTSF-modified CPB underwent progressive damage during the loading, and the samples still showed good integrity after failure. Additionally, the response relationship between energy evolution and damage development of WTSF-modified CPB during uniaxial compression was analyzed, and the damage constitutive model of CPB samples with different WTSF contents was constructed. This study provides a theoretical basis for the enhancement of CPB modified by adding WTSF, serving as a valuable reference for the design of CPB constructional backfill.

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废轮胎钢纤维改性水泥浆回填土的力学性能和损伤演变特性

在建筑回填采矿过程中，水泥浆回填（CPB）通常表现出高度脆性和有限的抗破坏性。本研究通过单轴压缩试验、声发射（AE）试验和扫描电子显微镜（SEM）研究了废轮胎钢纤维（WTSF）改性 CPB 的力学和损伤演变特性。结果表明，当 WTSF 含量为 0.5%、1% 和 1.5% 时，单轴抗压强度（UCS）均有所下降。当 WTSF 含量达到 1%时，改性 CPB 的单轴抗压强度与不含 WTSF 的相比降幅很小（0.37 兆帕）。当 WTSF 含量为 0.5%、1% 和 1.5% 时，WTSF 改性 CPB 的峰值应变分别增加了 18%、31.33% 和 81.33%，而弹性模量则分别降低了 21.31%、26.21% 和 45.42%。WTSF 的加入增强了改良型 CPB 中 AE 事件的活性，导致整个失效过程进展缓慢。失效后，改进型 CPB 仍保持一定的承载能力。一般来说，CPB 的破坏主要由拉伸裂缝引起。添加 WTSF 后，改性 CPB 样品加载到孔隙压实阶段时，拉伸裂纹的比例逐渐增加。AE 事件的三维定位结果表明，WTSF 改性 CPB 在加载过程中经历了渐进式损伤，而样品在失效后仍表现出良好的完整性。此外，还分析了 WTSF 改性 CPB 在单轴压缩过程中能量演化与损伤发展之间的响应关系，并构建了不同 WTSF 含量 CPB 样品的损伤构成模型。该研究为添加 WTSF 改性的 CPB 的增强提供了理论依据，为 CPB 建筑回填设计提供了有价值的参考。

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来源期刊

International Journal of Mining Science and Technology Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

19.10

自引率

11.90%

发文量

2541

审稿时长

44 days

期刊介绍： The International Journal of Mining Science and Technology, founded in 1990 as the Journal of China University of Mining and Technology, is a monthly English-language journal. It publishes original research papers and high-quality reviews that explore the latest advancements in theories, methodologies, and applications within the realm of mining sciences and technologies. The journal serves as an international exchange forum for readers and authors worldwide involved in mining sciences and technologies. All papers undergo a peer-review process and meticulous editing by specialists and authorities, with the entire submission-to-publication process conducted electronically.