摘要
为了解决建筑固废对采空区精准充填的问题,开展采空区充填新型浆液研发,建立考虑静置稠化、剪切稀释特性的强触变浆液流变模型,进行室内模拟堆积试验。结果表明:采用0~2mm、0~5mm两种颗粒组的建筑固废材料,得到复配强触变浆液触变剂、稳定剂、流变剂、水泥和建筑固废砂的最优配比,并得到浆液的触变性、稳定性、流变性、凝固过程及结石体强度等基本性能指标,以及浆液流动堆积坡面函数的表达式。该项研究成果的应用,可减轻采空区对生态环境的影响,减少老旧建筑物拆除所产生的大量建筑固废对土地资源的占用和环境污染。
In response to the challenge of achieving precise backfilling in mine cavities with construction solid waste,a comprehensive study was undertaken aimed at devising innovative slurry compositions specifically tailored for cavity filling applications.The study encompassed the development of a rheological model for highly thixotropic slurries,meticulously accounting for static thickening and shear-thinning attributes.Subsequently,an indoor accumulation simulation was executed to validate and refine this model through experimental testing.The findings unveiled the optimal compositional ratios of thixotropic agents,stabilizers,rheology modifiers,cement,and construction waste sand across two distinct particle size fractions,namely 0 to 2 millimeters and 0 to 5 millimeters.These results led to the determination of critical performance parameters,encompassing thixotropy,stability,rheological behavior,curing kinetics,and compressive strength of the resultant aggregate formations.Furthermore,the study derived an expression for the slurry's flow-accumulation slope function,thereby providing a quantitative measure of its behavior during deposition.The practical application of these research findings holds promise for mitigating environmental consequences emanating from mine cavities,as well as diminishing the land resource occupancy and pollution attributed to the disposal of substantial volumes of construction waste generated during the demolition of aged structures.
作者
李雄伟
侯彦威
姜涛
郭建磊
LI Xiongwei;HOU Yanwei;JIANG Tao;GUO Jianei(China Coal Technology&Engineering Group Xi′an Research Institute Co.,Ltd.,Xi′an,Shaanxi 710077,China)
出处
《水利与建筑工程学报》
2024年第2期80-85,101,共7页
Journal of Water Resources and Architectural Engineering
基金
陕西省基础研究计划基金面上项目(2020JM-642)。
关键词
采空区灾害
建筑固废
触变浆液
流变性
堆积试验
goaf disaster
construction and demolition waste
thixotropic grout
rheology
stacking test
