脉冲气体劈裂下套壳料的声发射特征及破坏模式研究

摘要/Abstract

摘要： 为解决袖阀管注浆中套壳料出浆裂缝少所导致的注浆压力大、浆液扩散均匀性差问题,提出了采用脉冲气体来对套壳料进行预先劈裂造缝的方法,对套壳料在脉冲气体作用下的声发射特征及裂缝演化机制进行了研究。基于自主搭建的脉冲气体加载装置,并联合声发射无损检测技术,开展了脉冲气体劈裂套壳料的试验研究。通过声发射参数分析了套壳料破坏过程中的声发射特征,评价了脉冲气体劈裂效果;综合RA-AF分析法及高斯混合模型(GMM),对套壳料发育裂缝类型进行了识别。研究结果表明:整个声发射演化过程可分为裂缝产生及扩展(Ⅰ)阶段、峰后破坏(Ⅱ)阶段;从声发射特征来看,龄期为3、5 d的脉冲气体劈裂效果比7 d时更好;综合抗压强度要求,A2组套壳料龄期为5 d时的劈裂效果最优;随着加载的进行,RA-AF数据点向高RA值、低AF值区移动,拉伸裂纹占比减小,剪切裂纹占比增大;套壳料破坏模式是以剪切破坏为主的拉剪混合破坏。

关键词: 脉冲气体劈裂, 套壳料, 声发射, RA-AF, 高斯混合模型, 裂纹演化

Abstract: In order to address the issues of high grouting pressure and poor slurry diffusion uniformity caused by the lack of cracks in the casing material during sleeve valve pipe grouting, a method of pre-splitting the casing material using pulsed gas is proposed. The acoustic emission characteristics and crack evolution mechanism of the casing material under the action of pulsed gas were studied. Based on a self-constructed pulsed gas loading device combined with acoustic emission nondestructive testing technology, experimental research on the pulsed gas splitting of the casing material was conducted. The acoustic emission characteristics during the damage process of the casing material were analyzed through acoustic emission parameter analysis, and the effect of pulsed gas splitting was evaluated. The development and identification of crack types in the casing material were carried out using the comprehensive RA-AF analysis method and the Gaussian mixture model (GMM). The research results show that the entire acoustic emission evolution process can be divided into the crack generation and propagation (Ⅰ) stage and the post-peak damage (Ⅱ) stage. In terms of acoustic emission characteristics, the splitting effect of the pulsed gas on the casing material aged for 3 and 5 d is better than that at 7 d. Considering the compressive strength requirements, the splitting effect of the A2 group casing material is optimal when aged for 5 d. As the loading progresses, the RA-AF data points move towards high RA values and low AF values, with the proportion of tensile cracks decreasing and the proportion of shear cracks increasing. The failure mode is a mixed tensile-shear failure dominated by shear failure.

Key words: pulse gas splitting, casing material, acoustic emission, RA-AF, Gaussian mixture model, crack evolution

中图分类号:

TU472.6

张延波, 张磊, 侯宁, 黄峰. 脉冲气体劈裂下套壳料的声发射特征及破坏模式研究[J]. 硅酸盐通报, 2024, 43(11): 3986-3995.

ZHANG Yanbo, ZHANG Lei, HOU Ning, HUANG Feng. Acoustic Emission Characteristics and Failure Modes of Casing Material under Pulse Gas Splitting[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(11): 3986-3995.

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