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为探究不同倾斜分层结构对充填体稳定性的影响，通过单轴压缩实验，系统研究了不同灰砂比及倾斜分层结构的充填体试件.对试件单轴抗压强度、割线模量、响应面交互作用、破坏模式等方面进行研究分析.结果表明：含倾斜分层结构试件的单轴抗压强度、强度弱化系数、割线模量均随着分层数、充填面倾角的增加而减小，灰砂比提高有利于减弱分层结构导致的弱化效应；同完整试件相比，含倾斜分层结构的试件在孔隙压密及裂纹扩展阶段历时较短，峰后破坏阶段表现为延性破坏.随着灰砂比的提高，试件达到峰值强度前，可压缩位移量变大；响应面交互模型中，分层数-灰砂比交互作用对充填体单轴抗压强度影响最为显著，分层数-倾斜角度不具有显著性；倾斜分层结构显著影响充填体的破坏模式，充填体试件的破坏均由充填面处开始.随分层面倾角的增大，试件的破坏模式由张拉破坏演化为张拉-剪切破坏，产生张拉贯通主裂纹的同时伴随次生剪切裂纹的产生.研究结果可为矿山设计含倾斜分层结构的充填体强度提供参考.
Abstract：In order to explore the influence of different inclined layered structures on the stability of backfill, the backfill specimens with different cement-to-sand ratios and inclined layered configurations were systematically studied through uniaxial compression experiments.The study focused on the uniaxial compressive strength, secant modulus, response surface interactions, and failure modes of the specimens.The results indicate the following: The uniaxial compressive strength, strength reduction coefficient, and secant modulus of specimens with inclined layered structures decrease with the increase in the number of layers and the inclination angle of the backfill surface.Increasing the cement-to-sand ratio helps to mitigate the weakening effect caused by the layered structure.Compared with intact specimens, those with inclined layered structures exhibit shorter durations during the pore compaction and crack propagation stages, and show ductile failure in the post-peak stage.As the cement-to-sand ratio increases, the compressible displacement before the specimen reaches peak strength also increases.In the response surface interaction model, the interaction between the number of layers and the cement-to-sand ratio has the most significant effect on the uniaxial compressive strength of the backfill body, while the interaction between the number of layers and the inclination angle is not significant.The inclined layered structure significantly affects the failure mode of the backfill body.Failure of the backfill specimens always initiates at the backfill surface.As the inclination angle of the layered surface increases, the failure mode of the specimen evolves from tensile failure to tensile-shear failure, with the formation of tensile through-cracks accompanied by the generation of secondary shear cracks.The findings of this study can provide a reference for the design of backfill bodies with inclined layered structures in mines.
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基本信息:
DOI：10.16112/j.cnki.53-1223/n.2025.06.521
中图分类号:TD803
引用信息:
[1]朱艾伦,孙伟,张盛友,等.倾斜分层充填体力学特性及破坏模式实验研究[J].昆明理工大学学报(自然科学版),2025,50(06):26-34.DOI:10.16112/j.cnki.53-1223/n.2025.06.521.
基金信息:
国家自然科学基金项目(52474131); 云南省重大科技专项(202202AG050014); 云南省基础研究计划项目(202101BE070001-038,202201AT070146)