聚合物改性膏体单轴压缩过程声发射响应及损伤演化特征

欧阳神央; 黄艳利; 周楠; 李明; 李晓彤; 李俊孟; 柯飞; 刘亚辉

doi:10.1007/s12613-023-2617-6

Volume 30 Issue 8

Aug. 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(8): 1502-1514

Shenyang Ouyang, Yanli Huang, Nan Zhou, Ming Li, Xiaotong Li, Junmeng Li, Fei Ke, and Yahui Liu, Experiment on acoustic emission response and damage evolution characteristics of polymer-modified cemented paste backfill under uniaxial compression, Int. J. Miner. Metall. Mater., 30(2023), No. 8, pp. 1502-1514. https://doi.org/10.1007/s12613-023-2617-6

Cite this article as:

Shenyang Ouyang, Yanli Huang, Nan Zhou, Ming Li, Xiaotong Li, Junmeng Li, Fei Ke, and Yahui Liu, Experiment on acoustic emission response and damage evolution characteristics of polymer-modified cemented paste backfill under uniaxial compression, Int. J. Miner. Metall. Mater., 30(2023), No. 8, pp. 1502-1514. https://doi.org/10.1007/s12613-023-2617-6

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研究论文

聚合物改性膏体单轴压缩过程声发射响应及损伤演化特征

1)
中国矿业大学矿业工程学院煤炭资源与安全开采国家重点实验室，徐州 221116，中国
2)
新疆工程学院，乌鲁木齐 830000，中国
3)
河南能源化工集团有限公司，郑州 450000，中国

通讯作者:
黄艳利 E-mail: 5306@cumt.edu.cn

文章亮点

(1) 系统测试了聚合物改性膏体的力学强度演化规律。

(2) 研究了聚合物改性膏体宏观裂纹演化特征。

(3) 利用声发射系统定位分析了聚合物改性膏体内部损伤裂纹。

中文摘要

膏体（CPB）的力学性能在一定程度上影响了采空区充填控顶效果。本文通过单轴压缩试验测试了聚合物改性膏体 (PCPB)的力学强度，分析了其承载压缩过程的破坏特征；同时利用声发射技术（AE）对28 d养护龄期试样的开裂过程进行实时监测和记录，并采用双AE指标方法(上升角和平均频率)对不同加载过程的开裂模式进行了分类。结果表明：聚合物能够显著增强PCPB的力学强度(当聚灰比为0.30时，28 d强度提高了102.6%)，并且随着聚合物掺量的增加，PCPB的力学强度越高。单轴压缩条件下，PCPB的宏观破坏裂纹多沿轴向方向，主裂纹贯穿试样，且主裂纹周围还分布大量小裂纹。整个加载过程中PCPB的AE响应可分为四个时期：平静期、缓慢增长期、急剧增长期和缓解期，且它们与应力-应变曲线的微孔隙压密阶段、弹性变形阶段、塑性变形阶段和破坏失稳阶段的同步性较高。AE事件主要集中在塑性变形阶段和破坏失稳阶段，且PCPB在上述四个阶段均发生了剪切破坏和拉伸破坏，但主要为拉伸破坏。

关键词:

Research Article

Experiment on acoustic emission response and damage evolution characteristics of polymer-modified cemented paste backfill under uniaxial compression

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Abstract

Abstract

The mechanical properties of cemented paste backfill (CPB) determine its control effect on the goaf roof. In this study, the mechanical strength of polymer-modified cemented paste backfill (PCPB) samples was tested by uniaxial compression tests, and the failure characteristics of PCPB under the compression were analyzed. Besides, acoustic emission (AE) technology was used to monitor and record the cracking process of the PCPB sample with a curing age of 28 d, and two AE indexes (rise angle and average frequency) were used to classify the failure modes of samples under different loading processes. The results show that waterborne epoxy resin can significantly enhance the mechanical strength of PCPB samples (when the mass ratio of polymer to powder material is 0.30, the strength of PCPB samples with a curing age of 28 d is increased by 102.6%); with the increase of polymer content, the mechanical strength of PCPB samples is improved significantly in the early and middle period of curing. Under uniaxial load, the macro cracks of PCPB samples are mostly generated along the axial direction, the main crack runs through the sample, and a large number of small cracks are distributed around the main crack. The AE response of PCPB samples during the whole loading process can be divided into four periods: quiet period, slow growth period, rapid growth period, and remission period, corresponding to the micro-pore compaction stage, elastic deformation stage, plastic deformation stage, and failure instability stage of the stress–strain curve. The AE events are mainly concentrated in the plastic deformation stage; both shear failure and tensile failure occur in the above four stages, while tensile failure is dominant for PCPB samples. This study provides a reference for the safety of coal pillar recovery in pillar goaf.
- polymer;
- cemented paste backfill;
- mechanical strength;
- acoustic emission

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