侧限压缩过程中散体矸石变形及破碎特征研究

摘要/Abstract

摘要： 散体矸石宏观变形的主要来源是侧限加载过程中对试样初始孔隙的直接压缩,以及压实压密阶段粗矸破碎后对孔隙的再次充填。采用加载设备与声发射装置相结合的试验系统,以加载速率为影响因素,基于理论推导和试验数据分析,对侧限压缩过程中散体矸石的宏观变形、孔隙率和破碎程度等特征进行了系统研究。研究结果表明:直接压缩初始孔隙对宏观变形的影响最为明显;孔隙率随着应变的减小而增大,与应力呈单调递减的反比例型复合函数关系;对散体矸石破碎分形函数进行了重新推导,比较双对数曲线拟合斜率得出,加载速率越大,破碎程度越小;声发射定位数随着试验力的增大而不断增加,随加载速率的增大而减少,试样中部颗粒破碎最为密集;颗粒的破碎程度越大,对孔隙的二次填充率越高,孔隙不容易被进一步压缩,试样抗变形能力增强。

关键词: 散体矸石, 侧限压缩, 宏观变形, 孔隙率, 破碎特征, 声发射定位

Abstract: The main sources of macroscopic deformation of granular gangue are the direct compression of the initial pores of the sample during the confined loading process and the refilling of pores after the crushing of coarse gangue in the compaction stage. An experimental system combining loading installation with acoustic emission device was adopted, and the loading rate was taken as influencing factor. Based on theoretical derivation and experimental data analysis, the macroscopic deformation, porosity and breakage degree of granular gangue in the confined compression process were systematically studied. The results show that the direct compression of initial pores has the most obvious effect on the macroscopic deformation. The porosity increases with the decrease of strain and decreases with the decrease of stress in an inversely proportional composite function. The breakage fractal function of granular gangue is rededuced. By comparing the slope of logarithmic curve, it is found that the higher the loading rate is, the smaller the breakage degree is. The acoustic emission location number increases with the increase of test force, but decreases with the increase of loading rate. The particle fragmentation in the middle of the sample is the most intensive. The larger the degree of particle breakage is, the higher the secondary filling rate of pores is. The pores are not easy to be further compressed, and the anti-deformation ability of the sample is enhanced.

Key words: granular gangue, confined compression, macroscopic deformation, porosity, breakage characteristic, acoustic emission location

中图分类号:

TD823

肖博, 李永亮, 李进, 王宇轩, 王梓旭. 侧限压缩过程中散体矸石变形及破碎特征研究[J]. 硅酸盐通报, 2021, 40(12): 4002-4010.

XIAO Bo, LI Yongliang, LI Jin, WANG Yuxuan, WANG Zixu. Deformation and Breakage Characteristics of Granular Gangue in Confined Compression Process[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(12): 4002-4010.

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