接触面积对结构面传播特性的影响
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摘要
岩体中大多数的结构面表现为既非连续也非完全不连续,试验研究发现结构面的接触面积对其透射系数影响非常大。采用基于连续介质的块体离散元程序(CDEM)模拟结构面处应力波传播过程,在结构面处进行了多尺度处理,模拟结构面的凹凸不平,研究了结构面的接触面积及其分布对应力波传播的影响,拟合得到透射系数和接触面积与总面积之比的关系是:纵波为Tp=0.25 ln(r)+1.003,横波为Ts=0.252 ln(r)+0.98。而且接触面积的分布也会影响应力波的透射系数和透射波的频谱分布。
Most of structural plane in rock mass is discontinuous but is not completely discontinuous.Experimental study find out that transmission coefficient is influenced greatly by contact area of structural plane.Propagation process of stress wave was simulated by CDEM(continuous block discrete element method).Roughness concentration of structural plane was simulated by multi-scale analysis on structural plane.The effects of contact area and distribution of structural plane on propagation of stress wave was studied.By fitting the relationship of transmission coefficients and the ratio of contact area to total area of structural plane was obtained: for longitudinal waveTp=0.258 ln(r) +1.003,for transverse waveTs=0.252 ln(r) +0.98.The study showed that transmission coefficients of stress wave and frequency spectrum of transmission wave are influenced by the distribution of contact area.
Most of structural plane in rock mass is discontinuous but is not completely discontinuous.Experimental study find out that transmission coefficient is influenced greatly by contact area of structural plane.Propagation process of stress wave was simulated by CDEM(continuous block discrete element method).Roughness concentration of structural plane was simulated by multi-scale analysis on structural plane.The effects of contact area and distribution of structural plane on propagation of stress wave was studied.By fitting the relationship of transmission coefficients and the ratio of contact area to total area of structural plane was obtained: for longitudinal waveTp=0.258 ln(r) +1.003,for transverse waveTs=0.252 ln(r) +0.98.The study showed that transmission coefficients of stress wave and frequency spectrum of transmission wave are influenced by the distribution of contact area.
引文
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[2]Roy S,Pyrak-Nolte L J.Interface wave propagating along ten-sile fractures in dolomite[J].Geophysical Research Letters,1995,22(20):2773~2777.
[3]Pyrak-Nolte L J.The seismic response of fractures and the in-terrelation among fracture properties[J].International Journal ofRock Mechanics and Mining Sciences,1996,33(8):787~802.
[4]高文蛟,爆炸应力波入射一定厚度结构面时透射系数分析[J].矿冶工程,2001,21(1):16~18.
[5]卢文波,应力波与可滑移岩石结构面间的相互作用研究[J].岩土力学,1996,17(3):70~75.
[6]Cai J G,Zhao J.Effects of multiple parallel fractures on apparen-tattenuation of stress waves in rock masses[J].InternationalJournal of Rock Mechanics and Mining Sciences,2000,(37):661~682.
[7]王鲁明,赵坚,华安增,等.节理岩体中应力波传播规律研究的进展[J].岩土力学,2003,24(S):602~606.
[8]田振农,李世海,肖南.应力波在一维节理岩体中传播规律的试验研究与数值模拟[J].岩石力学与工程学报,2008,27(S1):2687~2693.
[9][9]张秀丽,焦玉勇,刘泉声.节理对爆炸波传播影响的数值研究[J].岩土力学,2008,29(3):717~721.
[10]赵坚,蔡军刚,赵晓豹,等.弹性纵波在具有非线性法向变形本构关系的节理处的传播特性[J].岩石力学与工程学报,2003,22(1):9~17.
[11]张铁军,李业学.应力波透反射系数与结构面分形维数的关系初探[J].矿业研究与开发,2008,28(3):25~27
[12]李业学,谢和平,朱哲明,等.应力波穿越分形节理时的透反射规律研究[J].岩石力学与工程学报,2009,28(1):120~129.
[13]李灿苹,刘学伟,王祥春,等.地震波的散射理论和散射特征及其应用[J].勘探地球物理进展,2005,28(2):81~90.
[14]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.
[15]田振农,李世海.三维离散元不同尺度结构面计算方法及其在岩土爆破中的应用[J].岩石力学与工程学报,2007,26(S1):3009~3016.
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