西安科技大学学报2026，Vol.46Issue(3)：530-542,13.DOI:10.13800/j.cnki.xakjdxxb.2026.0306
风积沙-黄土协同增强煤基固废膏体力学特性
Synergistic enhancement of mechanical properties of coal-based solid waste paste by aeolian sand and loess
摘要
Abstract
To address the environmental problems caused by the large-scale accumulation of coal-based solid waste,paste backfill specimens were prepared by the orthogonal experimental method using coal-based solid waste and aeolian sand as the main aggregates.Through uniaxial compressive strength tests and microstructural analysis,the key factors affecting the strength of the backfill were identified.Com-bined with uniaxial compression stress-strain tests,the deformation characteristics and failure law of the backfill at different stress stages were investigated.The results show that the average 28 d compressive strength of the backfill is 13.9 MPa,meeting the 4.9 MPa strength requirement of Mahuangliang Coal Mine.The main factor affecting compressive strength is the proportion of aeolian sand and loess to ce-ment,whereas the fly ash-to-cement ratio has the least effect.The formation of compressive strength mainly arises from the synergistic effect of cement hydration and the pozzolanic reaction of active SiO2 and Al2O3 in coal gangue and fly ash.Coal gangue provides skeletal support,fly ash forms C-S-H gel through secondary hydration,and aeolian sand and loess optimize particle gradation,jointly impro-ving compactness and mechanical properties.When the coal gangue-to-cement ratio is 1.5,the fly ash-to-cement ratio is 1.5,the aeolian sand and loess-to-cement ratio is 0.5,and the mass concentration is 77％,the backfill exhibits a relatively high elastic modulus,limited crack development before the peak stress,and a marked increase after the peak stress.The crack evolution process undergoes the stages of closure,development,propagation,and coalescence,reflecting the whole process of internal stress accu-mulation,crack initiation and propagation,and eventual failure under loading.The stress-strain curve of coal-based solid waste paste shows four stages:Initial compaction,elastic deformation,yielding and plastic deformation,and failure.This study provides a theoretical basis and technical reference for the engineering application of coal-based solid waste in backfill mining.关键词
煤基固废/强度分析/膏体充填/水化反应/变形破坏Key words
coal-based solid waste/strength analysis/paste backfilling/hydration reaction/deformation and failure分类
矿业与冶金引用本文复制引用
王振平,文浩,辛民,郝雨涛,刘柏,王旭,王福泰,张铎..风积沙-黄土协同增强煤基固废膏体力学特性[J].西安科技大学学报,2026,46(3):530-542,13.基金项目
陕西省重点研发计划项目(2024GX-YBXM-488) （2024GX-YBXM-488）
科学家+工程师队伍建设项目(2024JH-KGDW-0111) （2024JH-KGDW-0111）
