摘要
为缓解井下充填骨料来源不足及固体充填捣实费时的问题,提出对松堆高孔隙率含矸固废骨料进行非填隙胶结,应用松堆落矸与自密实灌浆工艺试制了一种新型富孔贫胶固废充填材料。以该材料中胶结浆体与固废骨料双组分强度为正交变量,在室内开展了单轴压缩破坏试验,研究了其单轴压缩破坏的强度特征及破坏面统计规律;考虑浆体强度与骨料强度共同影响,建立了基于破坏面统计特征的双组分强度概化模型;定义了胶结浆体与固废骨料的综合强度利用率,分析了富孔贫胶固废充填材料最优配比范围及吨煤成本趋势。结果表明:自密实净浆固化强度与固废骨料强度共同控制富孔贫胶固废充填材料的单轴压缩强度与剪切面破断模式,2种组分强度与充填材料宏观强度呈现显著正相关关系;充填材料强度受到两种组分强度的短板效应制约,当一种组分强度富余时,另一种组分破坏比例将占主导;富孔贫胶固废充填材料单轴压缩呈剪切破坏模式,剪切面呈单斜面型与交叉斜面型,剪切面的平均角度为55.4°;应用富孔贫胶固废充填材料后松堆骨料的密实度可由85%降低至58%,且当现场固废骨料强度确定时,可根据最优配比范围确定胶结浆体强度以实现充填材料强度的最大化利用,从而降低固体充填的压实作业耗时与单方矸石用量。
In order to alleviate the shortage of underground aggregate sources and time cost of vibration and compaction during backfilling,a new type of high-porous low-cementitious waste backfilling material(HPLCM),which was composed of self-compacting slurry and loose packing waste with high porosity,was developed to achieve the purpose of low cementitious backfilling.Uniaxial compression tests were carried out on HPLCM in the laboratory,using orthogonal strength variables of cement slurry and waste aggregate,to study their failure strength characteristics and statistical laws.Considering the combined impact of solid waste and slurry strength,a generalized strength model of shear fracture was established based on the fracture statistical results.The coupled strength utilization ratio of solid waste aggregate and self-compacted slurry was defined,and the optimal ratio and cost of mix proportion of HPLCM were analyzed.The results indicate that the uniaxial compressive strength and failure mode of HPLCM are jointly controlled by the component strength of self-compacting cementitious slurry and solid waste aggregate.The strength of both components has a positive correlation with the strength of HPLCM,which is limited by the weaker component,and when one component grows stronger,the failure mode will be dominated by the other component.The uniaxial compressive test of HPLCM presents shear failure modes,including shear planes in single oblique and cross oblique patterns with an average angle of 55.4°.The density of loose packing aggregates can be reduced from 85%to 58%by using the proposed backfilling material,and the strength of cementitious slurry can be optimized within the optimal mixing range to maximize the utilization of filling material strength when the strength of in-situ solid waste aggregates is obtained.Thus,the compaction time of sol-id filling and the amount of single gangue can be reduced.
作者
崔春阳
李春元
王美美
杨冠宇
薛珊珊
王卫
CUI Chunyang;LI Chunyuan;WANG Meimei;YANG Guanyu;XUE Shanshan;WANG Wei(Deep Mining and Rock Burst Research Institute,Chinese Institute of Coal Science,Beijing 100013,China;Institute of Science and Technology,China Three Gorges Corporation,Beijing 100038,China)
出处
《煤炭科学技术》
EI
CAS
CSCD
北大核心
2023年第9期77-87,共11页
Coal Science and Technology
基金
国家自然科学基金资助项目(51904303)
中国煤炭科工集团科技创新创业面上资助项目(2022-2-MS002)。
关键词
贫胶充填
高孔隙率
充填材料
材料强度
强度模型
low cementitious backfilling
high porosity
backfilling material
material strength
strength model
