超临界CO_(2)致裂砂岩不同致裂阶段尾波信号演化规律研究  

Study on the Evolution Law of Coda Wave Signals in Different Fracturing Stages of Supercritical CO_(2)Fracturing Sandstone

作　　者：李果 LI Guo(China Energy Shendong Coal Group Co.,Ltd.,Shenmu,Shaanxi 719315,China)

机构地区：[1]国能神东煤炭集团有限责任公司,陕西神木市719315

出　　处：《矿业研究与开发》2025年第4期156-163,共8页Mining Research and Development

基　　金：“十四五”国家重点研发计划项目(2021YFC2900400);国家自然科学基金资助项目(52104077);重庆大学煤矿灾害动力学与控制国家重点实验室访问学者资助项目(2011DA105287-FW201903)。

摘　　要：为实现破岩过程的精准控制,研究不同岩石致裂阶段尾波信号的特征和演变规律,开展了三轴围压下超临界CO_(2)致裂砂岩的尾波信号试验,分析了砂岩在CO_(2)致裂过程中的尾波信号演化特征及信号参数变化规律,建立了基于概率密度的尾波扩展敏感核函数,揭示了不同致裂阶段尾波信号的特征和演变规律。结果表明:超临界CO_(2)致裂岩石可分为致裂前期、中期、后期和破坏后4个阶段;尾波波速相对变化率整体呈曲线下降趋势,体现岩样损伤的快速积累过程;扩散敏感核模型揭示了致裂过程中岩石损伤逐步累积,导致岩石内部波散射现象增强、能量损失加剧和尾波快速发育。In order to achieve precise control of the process of rock breaking,the characteristics and evolution laws of coda wave signals in different rock fracturing stages were studied.The coda wave signal test of supercritical CO_(2)fracturing sandstone under triaxial confining pressure was carried out,and the evolution characteristics and signal parameter changing law of coda wave signals during CO_(2) fracturing process were analyzed.The sensitive nuclei function of coda wave extension based on probability density was established,and the characteristics and evolution law of coda wave signal in different fracturing stages were revealed.The results indicate that supercritical CO_(2)fracturing rock can be divided into four stages:early stage,middle stage,late stage and post-failure stage.The relative change rate of coda wave velocity shows a downward trend as a whole,reflecting the rapid accumulation process of rock damage.The diffusion sensitive nuclei reveals that the rock damage gradually accumulates during the fracturing process,resulting in enhanced wave scattering inside the rock,increased energy loss and rapiddevelopmentof codawaves.

关 键 词：超临界CO_(2) 岩石致裂 红砂岩 尾波干涉 时频分析 

分 类 号：TD315[矿业工程—矿井建设] TU452[建筑科学—岩土工程]