摘要
以煤基固废为主要原料的覆岩裂隙注浆是控制岩层破断及含水层渗流失稳的关键技术,但固废浆液固结体在外部载荷作用下易开裂,阻裂性能较差。通过在煤基固废浆液中掺入纤维,制备纤维-固废注浆材料(Fiber-Solid waste grouting materials,F-SWG),利用电液伺服万能试验机和声发射系统,测试不同纤维种类与掺量的F-SWG固结体的声发射特征,分析其承载损伤过程中的裂隙发育特征及纤维阻裂机制。结果表明:掺入0.4%~0.6%的玄武岩纤维或聚乙烯醇纤维后,通过连接、黏结、交错与浆液基质相互作用形成三维约束结构,有效抑制了固结体后期裂隙发育及宏、微观裂隙转化,显著提升了固结体的阻裂性能。研究成果揭示了F-SWG固结体阻裂性能的增强机制,为注浆材料的堵水效果及煤基固废处置提供了新的理论依据。
Grouting into overburden cracks using coal-based solid waste as the main raw material is the main technical measure to control rock strata breakage and aquifer seepage instability.However,the solid waste grouting consolidation body is prone to cracking under external loads and has insufficient crack resistance.In this study,fiber-modified solid waste grouting(F-SWG)materials were prepared by incorporating fibers into coal-based solid waste grout.The acoustic emission characteristics of F-SWG consolidation bodies with different fiber types and contents were tested with the aid of an electro-hydrau-lic servo universal testing machine and an acoustic emission system.On this basis,the crack development characteristics and fiber crack-resistance mechanism during their load-bearing damage process were analyzed.It was found that adding 0.4%-0.6% basalt fibers or polyvinyl alcohol fibers results in the formation a three-dimensional constrained structure through connection,bonding,staggering,and the grout matrix.Such a three-dimensional constrained structure effectively inhibits late-stage crack development and macro-micro crack transformation in the consolidation body,and improves the crackresistance performance of the consolidation body.The research discloses the enhancement mechanism of the crack-resistance performance of F-SwG consolidation bodies,providing new theoretical bases for the water blocking effect of grouting materials and the disposal of coal-based solid waste.
作者
李俊孟
黄艳利
李晓彤
刘亚辉
吴相儒
刘佳楠
王士奇
芮溥呈
邬志雄
LI Junmeng;HUANG Yanli;LI Xiaotong;LIU Yahui;WU Xiangru;LIU Jianan;WANG Shiqi;RUI Pucheng;WU Zhixiong(School of Mines,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Key Laboratory of Deep Coal Resource Mining of Ministry of Education,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Inner Mongolia Jungar Banner Power Coal Industry Co Ltd,Ordos,Inner Mongolia 017100,China)
出处
《采矿与安全工程学报》
北大核心
2025年第4期925-936,共12页
Journal of Mining & Safety Engineering
基金
新疆重点研发专项项目(2023B03009-1,2022B03028-3)
地球深部探测与矿产资源勘查国家科技重大专项项目(2024ZD1004104)
中央高校基本科研业务费专项项目(2024ZDPYYQ1007)
国家自然科学基金项目(52374245,52364021)。
关键词
纤维改性
煤基固废
声发射
阻裂特征
fiber modification
coal-based solid waste
acoustic emission
fracture barrier characteristics
