单轴压缩下正交型交叉裂隙砂岩的破坏前兆试验研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (19) : 202-212.

论文

单轴压缩下正交型交叉裂隙砂岩的破坏前兆试验研究

王创业1，隋青瑞1,刘成城2，闫宇航1，朱黄金1，郭宇1

作者信息 +

Test study on failure precursors of orthogonal cross fractured sandstone under uniaxial compression

WANG Chuangye1, SUI Qingrui1, LIU Chengcheng2, YAN Yuhang1, ZHU Huangjin1, GUO Yu1

Author information +

文章历史 +

摘要

为探究单轴压缩下正交型交叉裂隙砂岩的破坏前兆信息，开展正交型交叉裂隙砂岩的单轴压缩声发射试验，分别从声发射振铃计数率的临界慢化特征、主频与平均频率质心的演化、小波包能谱特征三个角度进行研究。研究发现试样加载至临近峰值应力时均表现出明显的临界特征：声发射振铃计数率呈“双峰特征”、累积振铃计数急剧攀升；振铃计数率的自相关系数上升到较高的值发生大幅度波动、方差发生量级式“增加-降低-增加”的变化；低频声发射信号数量明显增加，平均频率质心则表现为“先增后减”式变化；对声发射波形信号进行4层小波包分解，3~16#频带能量占比呈“明显下降-波动式上升”式变化；三种破坏前兆识别方法所得到的前兆响应系数(PRC)的大小顺序依次为：临界慢化特征>频域特征>小波能谱特征，前兆响应应力(PRSR)的大小顺序与前者相反；随着主裂隙与轴向应力之间夹角的增大；随着主裂隙与轴向应力夹角的增大，三种破裂前兆识别方法所识别前兆点出现时间均延迟。

Abstract

To explore the damage precursor information of orthogonal cross-fractured sandstone under uniaxial compression, uniaxial compression acoustic emission tests of orthogonal cross-fractured sandstone were carried out. The research was conducted from three perspectives: the critical slowing down feature of acoustic emission ringing counting rate, the evolution of the centroid of main frequency and average frequency, and the characteristics of Wavelet Packet Energy Spectrum. The experimental results show that when the samples were loaded to the peak stress, they exhibited obvious critical characteristics: the count rate of acoustic emission ringing presented a "double-peak feature", and the cumulative ringing count rate soared; the autocorrelation coefficient of the ringing count rate rose to a higher value and fluctuated greatly, and the variance changed in the order of "increase-decrease-increase"; the number of low-frequency acoustic emission signals increased significantly, and the centroid of average frequency exhibited a "increase first and then decrease" change; The acoustic emission waveform signal was decomposed into 4 layers of wavelet packets, and the energy ratio of 3~16# frequency band changed in the order of "obviously decreasing - fluctuating increasing"; The order of precursor response coefficients (PRC) obtained by three precursor identification methods is as follows: critical slowing down feature > frequency domain feature > wavelet energy spectrum feature. The order of precursor response stress (PRSR) is opposite to that of the former. As the angle between the main fracture and the axial stress increases, the time of occurrence of the precursor points identified by the three methods of identifying pre-rupture precursors is delayed.

导出引用

王创业1, 隋青瑞1, 刘成城2, 闫宇航1, 朱黄金1, 郭宇1. 单轴压缩下正交型交叉裂隙砂岩的破坏前兆试验研究[J]. 振动与冲击, 2024, 43(19): 202-212

WANG Chuangye1, SUI Qingrui1, LIU Chengcheng2, YAN Yuhang1, ZHU Huangjin1, GUO Yu1. Test study on failure precursors of orthogonal cross fractured sandstone under uniaxial compression[J]. Journal of Vibration and Shock, 2024, 43(19): 202-212

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