A 1D equivalent medium method for wave propagation across parallel jointed rock mass

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	A 1D equivalent medium method for wave propagation across parallel jointed rock mass
	Li, J. C.1; Li, H. B.1; Ma, G. W.2,3; Zhao, J.4
	2012
会议日期	OCT 17-21, 2011
会议地点	Beijing, PEOPLES R CHINA
关键词	dynamic equivalent method rock joints rock mass wave propagation viscoelastic model
页码	1231-1236
英文摘要	The one-dimensional equivalent medium method proposed in the present paper is an extension of the study by Li et al. (J.C. Li, G.W. Ma and J.Zhao. An equivalent viscoelastic model for rock mass with parallel joints. Journal of Geophysical Research, 115(B03), 2010). By analyzing the normal and shear equivalent property of a parallel jointed rock mass, the improved method is mainly to investigate P- and S-wave propagation normally across a rock mass with a set of parallel joints. For P- or S-wave, the method includes two portions: a viscoelastic medium model and a concept of "VirtualWave Source (VWS)". The viscoelastic medium model is to describe the normal and shear property of the Representative Volume Element (RVE) for a rock mass. The VWS is proposed to take into account the wave reflections between the joints. Parameters in the viscoelastic medium model are derived analytically according to the basic solutions for P- or S-wave propagation across a RVE. The proposed method is then verified by applying identical incident waves to the discontinuous rock mass and the corresponding equivalent medium at one side to compare the output waves at the other side. The results from the Equivalent Medium Method (EMM) are very similar to those determined from the Displacement Discontinuity Method (DDM). The proposed method can be effectively applied to analyze P- or S-wave propagation normally across discontinuous rock mass with a set of parallel joints. By analysis, it is found that the P- or S-wave propagation normally across an equivalent medium is related to the VWS number and the ratio of the VWS spacing to an incident wave length. For a given VWS number, if the wave length of the incident wave is sufficiently long compared to the joint spacing, the effect of the VWS on wave propagation across rock mass is prominent. Finally, frequency dependence and joint spacing effect on the wave propagation across parallel jointed rock mass are discussed.
源文献作者	Qian, Q ; Zhou, Y
会议录	HARMONISING ROCK ENGINEERING AND THE ENVIRONMENT
会议录出版者	CRC PRESS-TAYLOR & FRANCIS GROUP
会议录出版地	BOCA RATON
语种	英语
WOS研究方向	Engineering
WOS记录号	WOS:000392521000221
内容类型	会议论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/4646]
专题	岩土力学所知识全产出_会议论文国家重点实验室知识产出_会议论文
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn ; 2.Univ Western Australia, Sch Civil & Resource Engn; 3.Nanyang Technol Univ, Sch Civil & Environm Engn ; 4.Ecole Polytech Fed Lausanne, Lab Rock Mech LMR
推荐引用方式 GB/T 7714	Li, J. C.,Li, H. B.,Ma, G. W.,et al. A 1D equivalent medium method for wave propagation across parallel jointed rock mass[C]. 见:. Beijing, PEOPLES R CHINA. OCT 17-21, 2011.