Λεπτομέρειες βιβλιογραφικής εγγραφής
| Τίτλος: |
Damage evolution and constitutive modeling of coal-based solid waste cemented backfill under different curing ages. |
| Συγγραφείς: |
Li, Tao1,2,3 (AUTHOR), Li, Yue1,2 (AUTHOR) x1360141107@163.com, Liu, Bo1,2 (AUTHOR), Zhong, Hai3 (AUTHOR) |
| Πηγή: |
Archives of Civil & Mechanical Engineering (Elsevier Science). Sep2026, Vol. 26 Issue 5, p1-26. 26p. |
| Θεματικοί όροι: |
*Damage models, *Acoustic emission, *Controlled low-strength materials (Cement), *Axial loads, *Coal mine waste, *Crack propagation, *Microstructure |
| Περίληψη: |
To enhance the utilization of coal-based solid wastes and address the challenges associated with real-time characterization and prediction of damage in backfill during service, this study develops a cemented backfill jointly activated by coal gangue, fly ash, gasification slag, and desulfurization gypsum. In addition, a full-process damage constitutive modeling method integrating acoustic emission (AE) characteristic parameters with binary medium theory is proposed. First, the optimal mix proportion was determined using an orthogonal experimental design. Uniaxial compression tests with synchronous AE monitoring were subsequently conducted on specimens prepared with the optimal mixture at different curing ages to reveal the staged characteristics of damage evolution and the law of characteristic stresses; the macro–micro correlation mechanism was further elucidated on the basis of microstructural observations. The results indicate that the optimal mixture consists of 60% coal gangue, a gradation index of 0.4, a fly ash-to-slag ratio of 2:1, and 5% desulfurization gypsum. Analysis of damage evolution reveals five distinct stages: initial microcrack compaction, a quiescent elastic deformation stage, stable crack initiation, unstable crack propagation, and postpeak brittle failure. With increasing curing age, the closure stress ratio decreases from 32.35 to 19.57%, whereas the crack initiation stress ratio and damage stress ratio increase from 69.12 to 85.65% and from 90.59 to 95.83%, respectively. SEM characterization revealed a pronounced densification of the microstructure as the curing age increased. The predicted curves from the proposed damage constitutive model agree well with the experimental data and effectively capture the full stress–strain response of the backfill under loading. These findings provide a theoretical basis for the ratio optimization, damage monitoring, and stability prediction of coal-based solid waste cemented backfill. [ABSTRACT FROM AUTHOR] |
| Βάση Δεδομένων: |
Academic Search Index |