高压气体破岩振动信号混沌分形特征研究

Study on chaotic fractal characteristics of high-pressure gas rock-breaking vibration signal

  • 摘要: 为探究高压气体破岩振动信号的非线性混沌分形特征,研发新型破岩气体发生器并选取岩性稳定的石灰岩露天矿场开展气体破岩试验,采用高速摄影呈现破岩过程并监测振动效应,精细化提取破岩振动信号的非线性特征。结果表明:相较于乳化炸药爆破,高压气体破岩具有高频低幅特征,其信号分形盒维数值更小且频域分布更为有限,多重分形谱开口宽度更窄且能量分布奇异性更小;随着频率的降低,气体破岩信号中包含的优势模态分量混沌吸引子在二维相平面中的轨迹表现为长轴与短轴比逐渐减小的椭圆轨迹,最终汇聚在椭圆中心稳固点附近,具有典型的混沌动力特征。研究结果为双碳目标下矿岩的安全高效开采和灾害评估提供了探索性思路。

     

    Abstract: To investigate the nonlinear chaotic fractal characteristics of high-pressure gas rock-breaking vibration signals, a new rock-breaking gas generator was developed and gas rock breaking experiments were conducted in a stable limestone open-pit mine. High-speed photography was used to capture the rock breaking process and monitor the vibration effects. The nonlinear characteristics of the collected rock-breaking vibration signals were finely extracted. The results show that, compared with emulsion explosive blasting, high-pressure gas rock breaking has high-frequency and low-amplitude characteristics, with smaller fractal box dimension values and more limited frequency domain distributions. The opening width of the multifractal spectrum is narrower and the singularity of energy distribution is smaller; As the frequency decreases, the dominant mode component chaotic attractor contained in the gas rock-breaking signal exhibits an elliptical trajectory in the two-dimensional phase plane with a gradually decreasing ratio of the long axis to the short axis, ultimately converging near the stable point at the center of the ellipse, exhibiting typical chaotic dynamic characteristics. The research results provide exploratory ideas for safe and efficient mining and disaster assessment of mineral rocks under dual carbon targets.

     

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