不同纤维作用下尾砂胶结充填体早期力学特性及损伤本构模型研究  

Study on early mechanical properties and damage constitutive model of tailing-cemented backfill with different fibers

作　　者：赵康[1,2,3] 宋宇峰 于祥 周昀 严雅静 王军强[3] ZHAO Kang;SONG Yufeng;YU Xiang;ZHOU Yun;YAN Yajing;WANG Junqiang(School of Architectural and Surveying and Mapping Engineering,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 341000,China;Solids Waste and Chemicals Management Center,Ministry of Ecology and Environment,Beijing 100029,China;Lingbao Jinyuan Mining Company Limited,Lingbao,Henan 472500,China)

机构地区：[1]江西理工大学土木与测绘工程学院,江西赣州341000 [2]生态环境部固体废物与化学品管理技术中心,北京100029 [3]灵宝金源矿业股份有限公司,河南灵宝472500

出　　处：《岩石力学与工程学报》2022年第2期282-291,共10页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51764013);江西省主要学科学术和技术带头人培养计划领军人才项目(20204BCJ22005);江西省自然科学青年重点基金项目(20192ACBL21014)。

摘　　要：为了提高某金矿尾砂胶结充填体材料的稳定性,保障矿山采空区充填效果,对加入不同纤维(聚丙烯腈纤维(JBX)、玻璃纤维(BL)、聚丙烯腈和玻璃混合纤维(HJB))的尾砂胶结充填体的早期力学性能和损伤特征进行研究,通过单轴压缩试验得到了不同纤维作用下充填体损伤本构模型。试验结果表明:在不同纤维作用下尾砂胶结充填体单轴抗压强度关系为:σ_(BL)>σ_(HJB)>σ_(JBX)>σ_(无纤维);纤维对裂纹的扩展有明显的干扰和阻滞作用,使裂纹较多且细小,纤维极大地增强了充填体的韧性;加入混合纤维对裂纹的阻断效果明显优于单一纤维;含纤维尾砂胶结充填体在峰后破坏时并未完全失去承载能力,仍能继续承载部分压剪应力,由此构建不同纤维胶结充填体损伤本构理论模型;并用6种不同的损伤参数对损伤变量进行修正,得到不同纤维尾砂胶结充填体损伤本构模型曲线;通过试验对理论模型进行验证,二者的应力-应变曲线吻合度较高,表明所建立的理论模型对不同纤维尾砂胶结充填体的力学性能分析和评估具有一定的参考价值。In order to improve the stability of tailing-cemented backfill of a gold mine and to ensure the backfill effect of the goaf of the mine,the early mechanical properties and damage characteristics of tailing-cemented backfills with different fibers(polyacrylonitrile fibers,glass fibers,polyacrylonitrile fibers and glass fibers mixed fibers) were studied,and a damage constitutive model of the tailing-cemented backfill with different fibers was obtained by uniaxial compression test. The test results show that the uniaxial compressive strength of the tailing-cemented backfill with glass fibers is the largest,followed by mixed figers,polyacrylonitrile fibers and fibreless. The fibers have obvious interference and retarding effect on the crack propagation,making the cracks more and smaller,and greatly enhance the toughness of the cemented tailings backfill. The crack blocking effect of mixed fibers is significantly better than that of single fibers. The tailing cemented backfill with fibers does not completely lose its load-bearing capacity after the peak,and continues to carry part of the compressive-shear stresses due to its high toughness. A theoretical damage constitutive model of tailing-cemented tailings backfills with different fibers was built,and the model curve was obtained through correcting the damage variables by six different damage parameters. Finally,the theoretical model was verified through experiments. It is revealed that the stress-strain curves from the model and the experiments are in good agreement,showing that the established theoretical model has certain reference value for the analysis and evaluation of the mechanical properties of tailing-cemented backfills with different fibers.

关 键 词：采矿工程 纤维 尾砂胶结充填体 单轴压缩 力学特性 损伤本构模型 损伤参数 

分 类 号：TD32[矿业工程—矿井建设]