海堤探地雷达探测模型试验研究

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Abstract In order to analyze the application of ground penetrating radar(GPR) in coastal riprap embankment，the model experiment is conducted. The experiment is carried out under different depths of saltwater. Then，through comparing the measured results with those obtained by numerical FDTD analysis for verification，the target reflection interface can be distinguished in waveform figure；the depth and shape image of riprap bottom boundary are investigated after calculating travel time difference and velocity. According to influence of saltwater on GPR signal，the experimental results indicate that the GPR is effective to identify the riprap bottom boundary of coastal embankment without saltwater. When model is submerged by seawater，the dielectric coefficient and electrical conductivity of media increase significantly. Moreover，the detecting error increases with the submergence depth and the interface image appears fuzzy. By using the linear characteristic of influence lines obtained from the forward simulation，the error of model experiment is corrected. Therefore，it can provide the basis for GPR application in coastal embankment.

Key words： geophysics ground penetrating radar(GPR) riprap coastal embankment model experiment dielectric coefficient two-dimensional forward simulation riprap bottom boundary

Received: 18 November 2009

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https://rockmech.whrsm.ac.cn/EN/Y2011/V30/IS1/2826

[1] 李大心. 探地雷达方法与应用[M]. 北京：地质出版社，1994.(LI Daxin. The method and application of GPR[M]. Beijing：Geological Publishing House，1994.(in Chinese)) [2] 李术才，李树忱，张庆松. 岩溶裂隙水与不良地质情况超前预报研究[J]. 岩石力学与工程学报，2007，26(2)：217–226.(LI Shucai，LI Shuchen，ZHANG Qingsong. Forecast of karst-fractured groundwater and defective geological conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(2)：217–226.(in Chinese)) [3] BENSON A. K. Applications of ground penetrating radar in assessing some geological hazards：examples of groundwater contamination，faults，cavities[J]. Journal of Applied Geophysics，1995，33(1/2/3)：177–193. [4] KIM J H， YI M J. Application of geophysical methods to the safety analysis of an earth dam[J]. JEEG，2007，12(2)：221–235. [5] 庄尚翰. 应用地质雷达数值分析模拟多重性孔洞讯号之研究[硕士学位论文][D]. 云林：云林科技大学，2005.(ZHUANG Shanghan. Analyzing the reflection signal of multiple voids using the numerical simulation of georadar[M. S. Thesis][D]. Yunlin：Yunlin University of Science and Technology，2005.(in Chinese)) [6] NAKASHIMA Y，ZHOU H，SATO M. Estimation of groundwater level by GPR in an area with multiple ambiguous reflections[J]. Journal of Applied Geophysics，2001，47(2)：241–249. [7] 殷勇，朱大奎，关洪军，等. 应用探地雷达方法对海南岛博鳌海岸沙坝的研究[J]. 海洋地质与第四纪地质，2002，22(3)：119–128.(YIN Yong，ZHU Dakui，GUAN Hongjun，et al. Application of ground-penetrating-radar to coastal bar studies in Boao in eastern Hainan Island of China[J]. Marine Geology and Quaternary Geology，2002，22(3)：119–128.(in Chinese)) [8] NIGEL J C，TIM M M. The application of finite-difference time- domain modeling for the assessment of GPR in magnetically lossy materials[J]. Journal of Applied Geophysics，2009，67(4)：296–308. [9] 中华人民共和国行业标准编写组. JTJ/T258—98 爆炸法处理水下地基和基础技术规程[S]. 北京：中国建筑工业出版社，1998.(The Professional Standards Compilation Group of People?s Republic of China. JTJ/T258—98 Technical specifications for the method of explosive in treating with underwater foundation and base[S]. Beijing：China Architecture and Building Press，1998.(in Chinese)) [10] JONES S B，WRAITH J M. Time domain reflectometry(TDR) measurement principles and applications[J]. Hydrological Processes，2002，16(1)：141–153. [11] 杜军. 盾构隧道壁后注浆探测图像识别及沉降控制研究[博士学位论文][D]. 上海：同济大学，2006.(DU Jun. Simulation of GPR detecting of grouting materials behind shield tunnel segments[Ph. D. Thesis][D]. Shanghai：Tongji University，2006.(in Chinese)) [12] YEE K S. Numerical solution of initial boundary value problems involving Maxwell?s equations in isotropic media[J]. IEEE Antennas and Propagation，1966，14(3)：302–307. [13] 周奇才，李炳杰，郑宇轩. 基于GPRMax2D的探地雷达数图像正演模拟[J]. 工程地球物理学报，2008，5(4)：396–399.(ZHOU Qicai，LI Bingjie，ZHENG Yuxuan. Forward simulation of GPR image based on GPRMax2D[J]. Chinese Journal of Engineering Geophysics，2008，5(4)：396–399.(in Chinese)) [14] 肖明顺. 探地雷达数值模拟的吸收边界条件研究[J]. 工程地球物理学报，2008，5(3)：315–320.(XIAO Mingshun. Research on boundary conditions in forward modeling of ground penetrating radar[J]. Chinese Journal of Engineering Geophysics，2008，5(3)：315–320.(in Chinese)) [15] GIANNOPOULOS A. The investigation of transmission-line matrix and finite-difference time-domain methods for the forward problem of ground probing radar[Ph. D. Thesis][D]. York：University of York，1997. [16] GIANNOPOULOS A. A numerical investigation into the accuracy of determining dielectric properties and thicknesses of pavement layers using reflection amplitude GPR data[C]// Proceeding of the 10th International Conference on Ground Penetrating Radar. [S.l.]：[s.n.]，2004：655–658.