煤田地质与勘探2025，Vol.53Issue(5)：163-175,13.DOI:10.12363/issn.1001-1986.25.01.0049
多源煤基固废胶结充填体卸围压变形与损伤破坏试验
Experimental study on unloading confining pressure deformation and damage failure of multi-source coal-based solid waste cemented backfill
摘要
Abstract
[Objective]The preparation of multi-source coal-based solid waste into filling materials for interval strip filling mining is one of the important means of green coal mining.The deformation and failure law of multi-source coal-based solid waste cemented backfill during strip coal pillar mining directly affects the stability of the stope.[Methods]Five typical solid wastes were mixed with cement to prepare cemented backfill.The conventional triaxial and constant axial pressure unloading confining pressure stress tests of backfill specimens were carried out.The stress-strain curves and failure characteristics of backfill under two stress loading paths were analyzed.The evolution law of deformation parameters with confining pressure during unloading confining pressure was explored,and the unloading damage mech-anism and strength criterion of backfill were revealed.[Results and Conclusions]The results show that:(1)The back-fill specimens show brittle failure characteristics in the conventional triaxial test.The cracks gradually develop and rap-idly expand during failure.The brittle failure characteristics in the unloading confining pressure test are enhanced.The strain change value before the failure of the specimen is less than 6.5%of the failure.(2)In the process of unloading confining pressure,the volume deformation of the filling body specimen changes from compression to expansion,the deformation modulus decreases by 10%of the failure stage,and the Poisson's ratio breaks through the elastic-plastic ma-terial limit of 0.5 when the specimen is destroyed.(3)The confining pressure difference ratio decreases linearly with the initial confining pressure,which indicates that the backfill is more likely to be destroyed under high confining pressure environment,and the evolution of damage factor D is highly synchronized with Poisson's ratio.(4)The Mogi-Coulomb strength criterion is suitable for the triaxial test of backfill specimens under constant axial compression and unloading confining pressure.The unloading behavior has a weakening effect on the cohesion of the backfill,and has a strengthen-ing effect on the internal friction angle.The research results provide a reference for the stability control of interval strip filling mining.关键词
三轴卸围压/多源煤基固废/胶结充填体/损伤演化/Mogi-Coulomb强度准则Key words
triaxial unloading confining pressure/multi-source coal-based solid waste/cemented backfill/damage evolu-tion/Mogi-Coulomb strength criterion分类
矿业与冶金引用本文复制引用
何祥,魏龙强,杨科,张通,张村,张子龙,陈焱军..多源煤基固废胶结充填体卸围压变形与损伤破坏试验[J].煤田地质与勘探,2025,53(5):163-175,13.基金项目
国家自然科学基金青年项目(52404106) （52404106）
国家自然科学基金重点项目(52130402) （52130402）
安徽省优秀科研创新团队项目(2024AH010009) （2024AH010009）
