波速和衰减对岩石力学参数和岩体结构变化的敏感性研究
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摘要
地震波在不同的岩石和岩体结构传播时具有不同的波速,采用Kelvin-Voigt体为粘弹性介质模型,研究均匀粘弹性体中波速和衰减对介质的力学参数变化的敏感性,通过试验,研究了波速和衰减对结构面刚度变化的敏感性。结果表明,衰减比波速对岩石力学参数和结构面刚度的变化更敏感,因此衰减系数更适合作为波动探测的表征量。
Wave velocity is different when seismic wave transmit in different rock and rock mass structure,adopt Kelvin-Voigt as viscoelastic medium model,make research on the sensibility of wave velocity and attenuation to mechanics parameter variation of medium in uniform viscoelastic body,make research on the sensibility of wave velocity and attenuation to structural plane stiffness variation through test.The result shows attenuation is more sensitive to the variation of rock mechanics parameter and structural plane stiffness than wave velocity,so attenuation coefficient is more suitable as token state of fluctuation detection.
Wave velocity is different when seismic wave transmit in different rock and rock mass structure,adopt Kelvin-Voigt as viscoelastic medium model,make research on the sensibility of wave velocity and attenuation to mechanics parameter variation of medium in uniform viscoelastic body,make research on the sensibility of wave velocity and attenuation to structural plane stiffness variation through test.The result shows attenuation is more sensitive to the variation of rock mechanics parameter and structural plane stiffness than wave velocity,so attenuation coefficient is more suitable as token state of fluctuation detection.
引文
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[2]王礼立.地震波基础[M].国防工业出版,北京,2005.
[3]杜启振,杨慧珠.线性黏弹性各向异性介质速度频散和衰减特征研究[J].物理学报,2002,51(9):2101~2108.
[4]刘孝敏,胡时胜,陈智.粘弹性Hopkinson压杆中波的衰减和弥散[J].固体力学学报,2002,23(1):81~86.
[5]苑春方,彭苏萍,张中杰等.Kelvin-Voigt均匀黏弹性介质中传播的地震波[J].中国科学D辑,地球科学2005,35(10):957~962.
[6]卢文波.地震波与可滑移岩石界面间的相互作用研究[J].岩土力学,1996,17(3):70~75.
[7]Cai J.G,Zhao J.Effects of multiple parallel fractures on apparentattenuation of stress waves in rock masses[J].International Jour-nal of Rock Mechanics and Mining Sciences,2000(37):661~682.
[8]王鲁明,赵坚,华安增等.节理岩体中地震波传播规律研究的进展[J].岩土力学,2003,24(增):602~606.
[9]蔡路军,马建军.预裂爆破减震机理及效果分析[J].中国矿业,2005,14(5):56~58.
[10]牛滨华,孙春岩.半无限空间各向同性黏弹性介质与地震波传播[M].北京:地质出版社,2007.1.
[11]王观石,胡世丽,李世海.应力波在闭合结构面传播过程的波形特性[J].矿业研究与开发,2008.28(6):34~36.
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