隧道砂岩破裂过程的电位信号研究
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
研究了砂岩破裂过程的电位信号规律及其破坏的电位前兆特征,结果表明,砂岩在破裂过程中有电位信号产生,电位信号与试样的变形破裂呈现良好的对应关系;电位信号对加载初期的变形破坏及裂纹的生成比较敏感,声发射在初期比较平淡,在加载后期电位幅值略有降低,而声发射信号大量增加;在试样的加速变形过程中在应变峰值的70%~97%范围内有强脉冲电位信号出现,电位信号的峰前突增可以作为砂岩破坏的前兆特征。通过研究煤岩体破裂过程的电位信号变化规律,可以加深对岩石破裂微观过程的认识,为将来利用电位技术监测隧道岩体稳定性及隧道施工安全提供了基础性研究结果。
In this paper,the variation rules of electric potential signals during fracture process of tunnel sandstone and the precursor characteristics before rupture were studied.The results show that the elec-tric potential signals will be generated in the fracture process of sandstone,and there is close corre-sponding relation between the electric potential signals and deformation and fracture of the samples.Meanwhile,the potential signals are more sensitive to the deformation and failure,and the propagation of cracks at the initial stage of loading,while the acoustic emission is fewness,and the potential ampli-tudes slightly reduce at the later stage of loading while the acoustic emissions increase abundantly.Within 70%~97% of the peak strain in the process of accelerating deformation,there will exit strong pulse potential signals,thus,the sharply increase of potential before strain peak can be used as the pre-cursor characteristics of sandstone rupture.Through the study of variation rules of electric potential during rock failure,it can deepen our understanding in the rock micro-fracture process which may pro-vide basic research results for monitoring tunnel rock mass stability and construction safety by using the electric potential technology.
引文
[1]何继善,吕绍林.瓦斯突出地球物理研究[M].北京:煤炭工业出版社,1999.
    [2]王恩元,何学秋,李忠辉,等.煤岩电磁辐射技术及其应用[M].北京:科学出版社,2009.
    [3]吴立新,王金庄.煤岩受压红外热象与辐射温度特征实验[J].中国科学,1998,28(1):41-46.WU Li-xin,WANG Jin-zhuang.Experimental study ofinfrared radiation features of coal and rocks under load-ing[J].China Science,1998,28(1):41-46.
    [4]王恩元,何学秋,窦林名,等.煤矿采掘过程中煤岩体电磁辐射特征及应用[J].地球物理学报,2005,48(1):216-221.WANG En-yuan,HE Xue-qiu,DOU Lin-ming,et al.Electromagnetic radiation characteristics of coal androcks during excavation in coal mine and their applica-tion[J].Chinese Journal Geophys,2005,48(1):216-221.
    [5]FRID V.Electromagnetic radiation method for rock andgas outburst forecast[J].Journal of Applied Geophys-ics.1997,38(2):97-104.
    [6]李忠辉.受载煤体变形破裂表面电位效应及其机理的研究[D].徐州:中国矿业大学安全工程学院,2007.
    [7]李忠辉,王恩元,刘贞堂,等.煤岩破坏表面电位特征规律研究[J].中国矿业大学学报,2009,38(2):187-192.LI Zhong-hui,WANG En-yuan,LIU Zhen-tang,et al.Study on characteristics and rules of surface potentialduring coal fracture[J].Journal of China University ofMining&Technology,2009,38(2):187-192.
    [8]王恩元,李忠辉,刘贞堂,等.受载煤体表面电位效应的实验研究[J].地球物理学报,2009,52(5):1318-1325.WANG En-yuan,LI Zhong-hui,LIU Zhen-tang,et al.Experimental study on surface potential effect of coalunder load[J].Chinese Journal Geophys,2009,52(5):1318-1325.
    [9]王立凤,王继军,陈小斌,等.岩石破裂电磁辐射(EMR)现象实验研究[J].地球物理学进展,2007,22(3):715-719.WANG Li-feng,WANG Ji-jun,CHEN Xiao-bin,et al.Experimental and theoretical investigations of electro-magnetic radiation induced by rock fracture[J].Progressin Geophysics,2007,22(3):715-719.
    [10]王继军,赵国泽,詹艳,等.中国地震电磁现象的岩石实验研究[J].大地测量与地球动力学,2005,25(2):22-28.WANG Ji-jun,ZHAO Guo-ze,ZHAN Yan,et al.Rockexperiments for research on seismic electromagneticphenomena in China[J].Journal of Geodesy and Geo-dynamics,2005,25(2):22-28.
    [11]吴小平,施行觉,郭自强.花岗岩压缩带电的实验研究[J].地球物理学报,1990,33(2):208-211.WU Xiao-ping,SHI Xing-jue,GUO Zi-qiang.Study onthe electrification of granite samples under compression[J].Chinese Journal of Geophysics,1990,33(2):208-211.
    [12]郝锦绮,刘力强,龙海丽,等.双轴压力下岩样自电位变化实验的新结果[J].地球物理学报,2004,47(3):475-482.HAO Jin-qi,LIU Li-qiang,LONG Hai-li,et al.Newresult of the experiment on self-potential change of rocksunder biaxial compression[J].Chinese Journal of Geo-physics,2004,47(3):475-482.
    [13]ECCLES D,SAMMONDS P R,CLINT O C.Laboratorystudies of electrical potential during rock failure[J].International Journal of Rock Mechanics&Mining Sci-ences,2005(42):933-949.
    [14]KUKSENKO V S,MAKHMUDOV K F.Mechanically-induced electrical effects in natural dielectrics[J].Techni-cal Physics Letters,1997,23(2):126-127.
    [15]VAROTSOS P,AND LAZARIDOU M.Latest aspects ofearthquake prediction in Greece based on seismic electricsignals[J].Tectonophysics,1991,188:321-347.
    [16]赵扬锋,潘一山,刘玉春,等.单轴压缩条件下煤样电荷感应试验研究[J].岩石力学与工程学报,2011,30(2):306-312.ZHAO Yang-feng,PAN Yi-shan,LIU Yu-chun,et al.Experimental study of charge induction of coal samplesunder uniaxial compression[J].Chinese Journal of RockMechanics and Engineering,2011,30(2):306-312.
    [17]牟宗龙,窦林名,李慧民,等.顶板岩层特性对煤体冲击影响的数值模拟[J].采矿与安全工程学报,2009,26(1):25-30.MU Zong-long,DOU Lin-ming,LI Hui-min,et al.Numerical simulation of roof stratum effect on coal massburst[J].Journal of Mining&Safety Engineering,2009,26(1):25-30.

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心