Work

Dynamic mechanical response of multisource coal-based solid waste backfill considering strain rate effects

Year: 2026

Type: article

Abstract: To address dynamic stability challenges in open-pit mining, the mechanical response of a novel multisource coal-based solid waste backfill was investigated using Split Hopkinson Pressure Bar (SHPB) and Digital Image Correlation (DIC). Results demonstrate significant positive strain rate sensitivity, where peak stress and strain increase monotonically, exhibiting a dynamic strengthening effect. Energy dissipation analysis reveals that high strain rates shorten the damage accumulation window, causing a transition from localized yielding to through-going brittle fracture. This rate-induced embrittlement is quantified by fractal dimensions increasing from 1.18 to 1.93. Furthermore, a dynamic damage constitutive model based on energy principles and the two-component medium hypothesis was developed. The model agrees well with experimental data, accurately describing the entire process of elastic growth, plastic yielding, and failure softening, thus providing a reliable theoretical basis for evaluating backfill stability under impact loading.

Source: Ain Shams Engineering Journal

DOI: 10.1016/j.asej.2026.104159

Authors: Tao Li, Yue Li, Bo Liu

Institutions: Sanming University, China University of Mining and Technology - Beijing

Language: English

Topic: Rock Mechanics and Modeling

Subfield: Mechanics of Materials

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $1,200