基于小波降噪理论对低频振动的类铀矿岩氡析出规律研究
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摘要
为研究铀矿井下采掘作业低频振动对铀矿岩氡析出的影响,自主研发了铀矿岩氡析出激振及测试系统,介绍了该测试系统的功能与操作方法。选取南方某铀尾矿砂、石英砂等原材料制备类铀矿岩试验块,开展空白组、10、20、30Hz不同振动频率下的累积氡活度浓度的测量,在Matlab平台上应用小波新阈值函数对原始数据进行优化处理,计算获得氡析出率。试验结果表明:小波阈值处理对累积氡活度浓度的降噪处理具有良好效果,其拟合斜率的相关系数大幅提升,达到0.976以上;对比空白组,所有试验组的氡累计浓度均有提高,其中频率为30Hz的试验组累计增长率最高,20Hz次之,10Hz最少;当振动频率提高到30Hz时,氡析出率达到最大值。试验结论可为铀矿井氡防护优化提供一定的参考。
For studying the influence of radon exhalation law by low frequency vibration from excavating operation under the shaft of uranium ore,the device of radon exhalation vibration exciter and measurement system are independently developed,and the function of measurement system and operation method are introduced as well.The experimental uranium-like rock lumps were made from selection of southern uranium tailing sand,quartz sand and other materials.The cumulative radon concentration at different frequency conditions such as blank group,10,20 and 30 Hz were measured and wavelet thresholding function is employed to optimize the original data at Matlab platform,and the radon exhalation rate is calculated.The experimental results show that the treatment of wavelet thresholding has a good effect on the de-noising of cumulative radon concentration,and the correlation coefficient of fitting slopes is increased significantly,average correlation coefficient is over 0.976.Compared with the blank group,the cumulative concentration of radon in all the experimental groups is increased.Among them;the experimental group with the frequency of 30 Hz has the highest cumulative growth rate,followed by 20 Hz,the 10 Hz is the least.The experimental results can provide a theoretical basis for radon protection in the process of uranium mining.
For studying the influence of radon exhalation law by low frequency vibration from excavating operation under the shaft of uranium ore,the device of radon exhalation vibration exciter and measurement system are independently developed,and the function of measurement system and operation method are introduced as well.The experimental uranium-like rock lumps were made from selection of southern uranium tailing sand,quartz sand and other materials.The cumulative radon concentration at different frequency conditions such as blank group,10,20 and 30 Hz were measured and wavelet thresholding function is employed to optimize the original data at Matlab platform,and the radon exhalation rate is calculated.The experimental results show that the treatment of wavelet thresholding has a good effect on the de-noising of cumulative radon concentration,and the correlation coefficient of fitting slopes is increased significantly,average correlation coefficient is over 0.976.Compared with the blank group,the cumulative concentration of radon in all the experimental groups is increased.Among them;the experimental group with the frequency of 30 Hz has the highest cumulative growth rate,followed by 20 Hz,the 10 Hz is the least.The experimental results can provide a theoretical basis for radon protection in the process of uranium mining.
引文
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[2] MOLLO S,TUCCIMEI P,HEAP M J,et al.Increase in radon emission due to rock failure:An experimental study[J].Geophysical Research Letters,2011,38(14):130-137.
[3]苏尔坦霍贾耶夫A H,蒂明斯基B T,斯皮里诺夫A H.放射性气体在研究地质过程中的应用[M].蔡祖煌,石慧馨,译.北京:地震出版社,1993.
[4]王长岭,陶淑芬,张世琴,等.强震水化学前兆场特征[J].西北地震学报,1996(1):1-7.
[5]韩学辉,王桂香.氡法监测地震的理想曲线模型探讨[J].太原理工大学学报,2000(1):101-103.
[6]申艳军,荣腾龙,杨更社,等.类砂岩相似材料配合比方案试验研究[J].水利水电科技进展,2016,36(4):75-79.
[7]董金玉,杨继红,杨国香,等.基于正交设计的模型试验相似材料的配比试验研究[J].煤炭学报,2012,37(1):44-49.
[8]肖桃李,李新平,贾善坡.深部单裂隙岩体结构面效应的三轴试验研究与力学分析[J].岩石力学与工程学报,2012,31(8):1666-1673.
[9]张哲,朱民安,张永祥.地下工程与人居环境氡防护技术[M].北京:原子能出版社,2010.
[10]尹丽冰.基于ANSYS/Ls-Dyna的某铀矿井下生产爆破震动数值模拟研究[D].赣州:江西理工大学,2015.
[11]季洪伟.活性炭测氡在伊犁盆地砂岩型铀矿找矿勘探中的应用研究[D].抚州:东华理工大学,2014.
[12]张东升,张炜,马立强,等.覆岩采动裂隙氡气探测研究进展及展望[J].中国矿业大学学报,2016,45(6):1082-1097.
[13]晏锐,蒋长胜,张浪平.汶川8.0级地震前水氡活度浓度的临界慢化现象研究[J].地球物理学报,2011,54(7):1817-1826.
[14]于国梁,张一云,黎亚平,等.用小波分析方法提高γ谱弱峰检测能力的研究[J].四川大学学报(自然科学版),2005(2):334-339.
[15]张新军,刘鸿福,张和生.应用小波新阈值函数对低放射性活性炭测氡γ能谱的消噪[J].原子能科学技术,2010,44(8):897-901.
[16]张忠相,李向阳,邓文辉,等.温度对多孔射气介质氡析出影响试验研究[J].工业安全与环保,2016,42(6):30-32.
[17]曹众为,李向阳,叶勇军,等.压力梯度对多孔介质氡析出率影响的试验研究[J].铀矿冶,2013,32(1):38-41+45.
[18] ZHAO G,HONG C,LI X,et al.Predictive analysis of shaft station radon concentrations in underground uranium mine:A case study[J].Journal of Environmental Radioactivity,2016(158/159):129-137.