地下空洞的面波探测
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摘要
利用有限元方法对Rayleigh面波的波场特征进行数值模拟,比较不同网格长度对Rayleigh面波频散的影响,针对20 Hz的主频震源,确定当网格划分长度为0.5 m时可满足要求。由于Rayleigh面波散射的时距关系为双曲线,在地面布置检波器可接收到地震信号,根据地震记录所携带的地质信息对非均匀地质体进行查找,通过数值模拟验证其有效性。以Lafayette体育馆的空洞为例,研究表明Rayleigh面波勘探结果与电法探测的结果吻合。通过频散数据按等效半空间法,反演得到V-H频散曲线排列和x-H-V速度等值线图,在勘探深度范围内,能较准确地确定地下空洞的位置。
The industry urgently needs economic exploring methods to check and find the underground cave, with physicalmechanical properties different from the around medium. One of the exploring methods is the use of the Rayleigh surface wave. The Rayleigh surface wave theory and the dispersion characteristics in transmission are discussed in this paper, and the Rayleigh surface wave field characteristics are simulated by the finite element method. Shaking with different main frequency epicenters, some models are established with dissimilar depth and size, and tallied up the results of the kinetics and the dynamics characteristics of the Rayleigh surface wave. Using the experiment result of the Rayleigh surface wave exploring methods in Lafayette University's gymnasium from southeast to northwest, for instance, this methods in checking and finding the underground cave are discussed.
The industry urgently needs economic exploring methods to check and find the underground cave, with physicalmechanical properties different from the around medium. One of the exploring methods is the use of the Rayleigh surface wave. The Rayleigh surface wave theory and the dispersion characteristics in transmission are discussed in this paper, and the Rayleigh surface wave field characteristics are simulated by the finite element method. Shaking with different main frequency epicenters, some models are established with dissimilar depth and size, and tallied up the results of the kinetics and the dynamics characteristics of the Rayleigh surface wave. Using the experiment result of the Rayleigh surface wave exploring methods in Lafayette University's gymnasium from southeast to northwest, for instance, this methods in checking and finding the underground cave are discussed.
引文
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[8]刘晶波,刘祥庆,赵冬冬.垂直断层破碎带对Rayleigh波传播与场地地震动反应的影响[J].爆炸与冲击,2008,28(6):507-514.Liu Jinbo,Liu Xiangqin,Zhao Dongdong.Effects of vertical faultfracture zones on the spreading of Rayleigh wave and ground motion[J].Explosion and Shock Waves,2008,28(6):507-514.
[9]Xia J H,Chen C,Tian G,et al.Resolution of high-frequency Rayleigh-wave data[J].Journal of Environmental&Engineering Geophysics,2005,10(2):99-110.
[10]杨天春.瑞利波“之”字形频散与道路结构频散曲线的正演研究[D].长沙:中南大学,2004.Yang Tianchun.Forward modeling of zigzag dispersion and pavementsystems dispersion curvers[D].Changsha:Central South University,2004.
[2]Xia J H,Miller R D,Park C B.Estimation of near-surface shear-wavevelocity by inversion of Rayleigh waves[J].Geophysics,1999,64(3):691-700.
[3]曹圣华,杨晓东,朱正坤,等.瑞利面波法用于软土地基勘察的试验研究[J].河海大学学报:自然科学版,2003,31(4):419-423.Cao Shenhua,Yang Xiaodong,Zhu Zhengkun,et al.Experimental studyon reconnaissance of soft foundations by Rayleigh surface wave method[J].Journal of Hohai University:Natural Sciences Edition,2003,31(4):419-423.
[4]周熙襄,王振国.利用瑞利面波调查表层结构的可行性探讨[J].石油地球物理勘探,2004,39(2):181-186.Zhou Xixiang,Wang Zhenguo.Discuss ion on feasibility of usingRayleigh wave to investigate near-surface structure[J].Oil GeophysicsProspecting,2004,39(2):181-186.
[5]刘晶波,李彬.Rayleigh波作用下地下结构的动力反应分析[J].工程力学,2006,23(10):131-135.Liu Jingbo,Li Bin.Dynamic response analysis of undergroundstructures during propagation of Rayleigh waves[J].EngineeringMechanics,2006,23(10):131-135.
[6]周红,陈晓非.凹陷地形对Rayleigh面波传播影响的研究[J].地球物理学报,2007,50(4):1182-1189.Zhou Hong,Chen Xiaofei.A study on the effect of depressedtopography on Rayleigh surface wave[J].Chinese Journal of Geophysics,2007,50(4):1182-1189.
[7]熊章强,张大洲,秦臻,等.瑞雷波数值模拟中的边界条件及模拟实例分析[J].中南大学学报:自然科学版,2008,39(4):824-830.Xiong Zhangqiang,Zhang Dazhou,Qin Zhen,et al.Boundaryconditions and case analysis of numerical modeling of Rayleigh wave[J].Journal of Central South University:Science and TechnologyEdition,2008,39(4):824-830.
[8]刘晶波,刘祥庆,赵冬冬.垂直断层破碎带对Rayleigh波传播与场地地震动反应的影响[J].爆炸与冲击,2008,28(6):507-514.Liu Jinbo,Liu Xiangqin,Zhao Dongdong.Effects of vertical faultfracture zones on the spreading of Rayleigh wave and ground motion[J].Explosion and Shock Waves,2008,28(6):507-514.
[9]Xia J H,Chen C,Tian G,et al.Resolution of high-frequency Rayleigh-wave data[J].Journal of Environmental&Engineering Geophysics,2005,10(2):99-110.
[10]杨天春.瑞利波“之”字形频散与道路结构频散曲线的正演研究[D].长沙:中南大学,2004.Yang Tianchun.Forward modeling of zigzag dispersion and pavementsystems dispersion curvers[D].Changsha:Central South University,2004.
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