摘要
微生物诱导碳酸钙沉积(MICP)方法通过微生物改性煤基固废材料,进而提升充填材料承载性能。提出了微生物改性煤基固废充填材料制备方法,采用巴氏芽孢杆菌(Bacillus pasteurii)改性煤基固废充填材料,研究不同材料掺量下微生物胶结充填材料的力学性能与微观结构特征,揭示微生物改性对煤基固废充填材料的胶结作用。研究表明:通过微生物改性后,充填材料抗压强度显著提升,煤矸石+35%粉煤灰+5%水泥+微生物的抗压强度达2680.8 kPa,相较于微生物改性前提高了279.1%,充填材料扩展度为230 mm,具有良好的流动性能;微观胶结物形态主要有絮状、条状和颗粒聚合3种结构,在协同作用下填充材料孔隙、连接煤基固废颗粒,提升了微生物改性充填材料整体胶结性能。研究成果可为煤矿胶结充填材料选择及性能优化提供有力支撑。
The microbial induced calcium carbonate deposition(MICP)method can improve the bearing capacity of the backfill material through microbial modification of coal-based solid wastes.In this study,a method for preparing microbially modified coal-based solid waste backfill materials using Bacil-lus pasteuri was proposed.Furthermore,the mechanical properties and microstructural characteristics of microbial-cemented backfill materials with different mix proportions were investigated,and the cementing effect of microbial modification on coal-based solid waste backfill materials was revealed.The following research findings were yielded:After microbial modification,the compressive strength of the backfill materials is greatly improved.The compressive strength of a mixture comprising coal gangue,35%fly ash,5%cemented backfill,and microbial formulation can reach 2,680.8 kPa,which represents a 279.1%increase relative to the value before microbial modification.Besides,it presents an expansion extent of 230 mm,which is indicative of excellent flowability.The microstructural morphology of the cementing substances primarily includes three forms,i.e.,flocculent,striated,and granular aggregates.These structures collectively fill material pores and connect coal-based solid waste particles,thereby enhancing overall cementation performance.The research findings offer robust support for the selection and performance optimization of cemented backfill materials in coal mines.
作者
李猛
刘硕
胡国辉
张吉雄
郭仕婕
霍彬彬
赵阳
LI Meng;LIU Shuo;HU Guohui;ZHANG Jixiong;GUO Shijie;HUO Binbin;ZHAO Yang(State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;School of Mines,Key Laboratory of Deep Coal Resource Mining of Ministry of Education,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Yangcheng Mine,Shandong Jikuang Luneng Coal and Electric Power Co Ltd,Jining,Shandong 272000,China)
出处
《采矿与安全工程学报》
北大核心
2025年第4期937-948,共12页
Journal of Mining & Safety Engineering
基金
国家自然科学基金重点项目(52130402)
国家自然科学基金面上项目(52474112)。
关键词
煤基固废
微生物改性
充填材料
力学性能
胶结作用
微观结构
coal-based solid waste
microbial modification
backfill materials
mechanical properties
cementation effect
microstructure
