| 尾矿砂介质渗流过程诱发声发射信号特征试验研究* |
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| 引用本文： | 赵红霞,吴鑫,罗筱毓,朱旭,林华李.尾矿砂介质渗流过程诱发声发射信号特征试验研究*[J].中国安全生产科学技术,2021,17(9):97-102. |
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| 作者姓名： | 赵红霞 吴鑫 罗筱毓 朱旭 林华李 |
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| 作者单位： | （1.四川师范大学 工学院，四川 成都 610101；2.四川大学 水利学与山区河流开发保护国家重点试验室，四川 成都 610065） |
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| 基金项目： | * 基金项目: 国家应急管理部安全生产重特大事故防治关键技术项目(sichuan-0011-2018AQ)；四川省科技计划项目（19YYJC2854）；四川省教育厅重点项目（18ZA0407） |
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| 摘 要： | 为了对渗流状态进行预测预报，从而预防渗透破坏事故的发生，基于地下水位上升、不同尾矿砂粒径以及渗流速度诱发的弹性波信号，采用声发射技术对尾矿砂介质的渗流状态进行监测。由800，1 100，1 400 mm 3种不同水头高度（流速）下的水流分别渗入0.1~0.25,0.25~0.5,0.5~1 mm以及混合粒径的尾矿砂介质中，模拟尾矿坝渗流，监测渗流过程的AE信号，分析液面上升、不同粒径尾矿砂颗粒以及不同流速下的渗流AE信号特征。结果表明:在试验所选用的几组粒径中，流速相同时，粒径较大的尾矿砂渗流产生的AE事件数量多、幅值大，即粒径越大，尾矿砂渗流过程的AE信号越强；同一粒径下，流速越小，渗流产生的AE信号幅值越小，AE事件数越少，即流速越小，尾矿砂渗流过程的AE信号越弱；液面上升过程中，在液面位置处产生的AE信号最强，且AE信号随液面位置与传感器距离而变化，越接近传感器AE信号越强，这表明AE技术能够较为准确地监测渗流过程中液面上升。研究结果可为尾矿坝渗流监测提供理论与技术支持。
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| 关 键 词： | 尾矿砂 声发射 渗流 液面上升 粒径 流速 |
Experimental study on characteristics of acoustic emission signals induced by seepage process of tailings sand medium |
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| ZHAO Hongxia,WU Xin,LUO Xiaoyu,ZHU Xu,LIN Huali.Experimental study on characteristics of acoustic emission signals induced by seepage process of tailings sand medium[J].Journal of Safety Science and Technology,2021,17(9):97-102. |
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| Authors: | ZHAO Hongxia WU Xin LUO Xiaoyu ZHU Xu LIN Huali |
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| Affiliation: | (1.College of Engineering,Sichuan Normal University,Chengdu Sichuan 610101,China;2.State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu Sichuan 610065,China) |
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| Abstract: | In order to predict the seepage state and prevent the occurrence of seepage failure accidents,the acoustic emission (AE) technology was used to monitor the seepage state of tailing sand medium based on the elastic wave signals induced by the rise of groundwater level,different particle sizes of tailings sand and seepage velocities.The water flow with three water head heights (flow velocities) of 800,1 100 and 1 400 mm was infiltrated into the tailings sand medium of 0.1~0.25,0.25~0.5,0.5~1 mm and mixed particle size,respectively.The seepage of tailings dam was simulated,then the AE signals of seepage process were monitored,and the characteristics of seepage AE signals under the rising liquid level,tailing sand particles with different particle sizes and different flow velocities were analyzed.The results showed that in the several groups of particle sizes selected in the tests,when the flow velocity was the same,the number and amplitude of AE events generated by the seepage of tailings sand with a larger particle size were large,that is,the larger the particle size,the stronger the AE signals in the seepage process of tailings sand.Under the same particle size,the smaller the flow velocity,the smaller the amplitude of AE signals generated by seepage,and the fewer the number of AE events,that is,the smaller the flow velocity,the weaker the AE signals in the seepage process of tailings sand.In the process of liquid level rising,the AE signals generated at the liquid level position was the strongest,and the AE signals changed with the distance between the liquid level position and the sensor,the closer to the sensor,the stronger the AE signals,which indicated that the AE technology could more accurately monitor the liquid level rising in the seepage process.The research results can provide theoretical and technical support for the seepage monitoring of tailings dam. |
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| Keywords: | tailings sand acoustic emission (AE) seepage rising liquid surface particle size flow velocity |
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