首页|多源煤基固废胶结充填体力学及变形破坏特征试验研究

多源煤基固废胶结充填体力学及变形破坏特征试验研究

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  • 国家科技期刊平台
  • NETL
  • NSTL
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[目的]为研究多源煤基固废胶结充填体的力学特性及变形破坏规律，选择 5种典型煤基固废，开展了煤基固废胶结充填体(Coal-Based Solid Waste Cemented Backfill，CBSWCB)的单轴压缩、声发射响应及微观结构测试试验。[方法]分析了CBSWCB单轴抗压强度的影响因素和交互作用，建立了基于交互作用的抗压强度影响因素四维空间可视化模型，结合CBSWCB的声发射及微观结构特征，阐明了单轴压缩条件下的力学演化特征及宏观变形破坏规律，从微观角度进一步论证了CB-SWCB承载过程中水化反应机理及宏细观联系。[结果和结论]试验结果表明:(1)单轴抗压强度的主要影响因素是质量分数，而炉底渣掺量的影响程度最小。(2)单轴压缩下CBSWCB的宏观变形破坏由塑性、弱劈裂破坏逐渐向脆性、剪切破坏转化。(3)CBSWCB试件声发射参数演化可以分为上升期、平静期、活跃期、稳定期，声发射累计振铃计数曲线呈现明显的"阶梯状"增长，累计振铃计数在上升期和平稳期内缓慢增加，在活跃期急剧增加，在稳定期逐渐趋于平缓。(4)水泥掺量偏低以及多源煤基固废充填材料属性差异导致水化反应程度有限，水化产物数量较少是CBSWCB单轴抗压强度普遍偏低的主要原因。研究结果可为多源煤基固废用于充填开采提供一定参考依据。
Experimental study on the mechanics and deformation failure characteristics of multi-source coal-based solid waste cemented backfill
[Objective]In order to study the mechanical properties and deformation failure laws of multi-source coal-based solid waste cemented backfill(CBSWCB),the uniaxial compression,acoustic emission response and microstruc-ture test experiments were carried out with 5 types of typical coal-based waste.[Methods]The factors influencing the uniaxial compressive strength of CBSWCB,as well as their interaction,were analyzed,and a four-dimensional spatial visualization model of the factors influencing the compressive strength based on their interactions was established.Be-sides,the mechanical evolution characteristics and macroscopic deformation failure laws under uniaxial compression conditions were elaborated by referring to the acoustic emission and microstructure characteristics of CBSWCB.Further,the hydration mechanism of CBSWCB during the loading process and the macroscopic and microscopic relation were demonstrated from the microscopic point of view.[Results and Conclusions]The test results show that:(1)Mass frac-tion is the main factor influencing the uniaxial compressive strength,while the blending amount of furnace bottom slag has the least influence.(2)Under the uniaxial compression,the macroscopic deformation failure of CBSWCB trans-forms from plastic and weak splitting failure to brittle and shear failure.(3)The evolution of acoustic emission paramet-ers of CBSWCB specimen can be divided into the rising stage,the quiet stage,the active stage and the stable stage.the cumulative ring count curve of acoustic emission shows an obvious"step-like"increase trend,with slow increasing in the rising and stable stages,sharp increasing in the active stage,and gradual leveling-off in the stable stage.(4)The low cement dosing and property difference of multi-source coal-based solid waste cemented backfills result in limited hydra-tion,and the low number of hydration products is the main reason for the generally low uniaxial compressive strength of CBSWCB.The research results could provide a certain reference basis for the use of multi-source coal-based solid waste in cut-and-fill mining.

coal-based solid wastecemented backfilldeformation failureacoustic emission characteristicsspatial visualizationhydration

杨科、张继强、何祥、魏祯、赵新元

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安徽理工大学 煤矿安全高效开采省部共建教育部重点实验室,安徽 淮南 232001

合肥综合性国家科学中心能源研究院(安徽省能源实验室),安徽 合肥 230031

安徽理工大学 矿业工程学院,安徽 淮南 232001

兰州工业学院 土木工程学院,甘肃 兰州 730050

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煤基固废 胶结充填体 变形破坏 声发射特征 空间可视化 水化反应

安徽省研究生教育质量工程项目国家自然科学基金重点项目国家重点研发计划

2023XSCX075521304022019YFC1904304

2024

10.12363/issn.1001-1986.24.03.0188

煤田地质与勘探
中煤科工集团西安研究院

煤田地质与勘探

CSTPCD北大核心
影响因子：1.079
ISSN：1001-1986
年,卷(期)：2024.52(6)
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