Forward Simulation of GPR Signals and Application Examples for Tunnel’s Advance Forecast

CHEN Song; ZHOU Li-ming; LUO Shi-xin

doi:10.11988/ckyyb.20140296

PDF(1648 KB)

Journal of Changjiang River Scientific Research Institute ›› 2015, Vol. 32 ›› Issue (9) : 128-133,139. DOI: 10.11988/ckyyb.20140296

ROCKSOIL ENGINEERING

Forward Simulation of GPR Signals and Application Examples for Tunnel’s Advance Forecast

CHEN Song¹,ZHOU Li-ming²,LUO Shi-xin¹

Author information +

History +

Abstract

Forecasting tunnel’s geological conditions using forward procedures of GPR (ground penetrating radar) provides interpretation basis, improves the accuracy of interpretation and helps avoid accidents. Currently most forward modellings are focused on the tunnel lining, but less on the surrounding rock in front of the working face.Through theoretical forward simulation by establishing large-scale geological model together with low-frequency antenna, we conclude that 1) the effective forecast distance is about 30m by using low-frequency antenna of 50MHz; 2) GPR could accurately identify the depth and shape of fracture zone, caves and other geological bodies, and cophase axis of reflected waves is consistent with that in theoretical model; 3) the variation trend of dielectric constant of surrounding rock in the front could be obtained from the wave phase and amplitude changes of single-channel data; 4) the electromagnetic waves attenuate more rapidly in complex model, and the simulation result is weaker than that of single geological model. Finally, we give two application examples to verify the forward modelling and provide a reference for reflected waves with the same shape.

Key words

tunnelling engineering / advance forecast / GPR / finite difference / forward simulation

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

CHEN Song,ZHOU Li-ming,LUO Shi-xin. Forward Simulation of GPR Signals and Application Examples for Tunnel’s Advance Forecast[J]. Journal of Changjiang River Scientific Research Institute. 2015, 32(9): 128-133,139 https://doi.org/10.11988/ckyyb.20140296

References

[1] 徐济川,黄少霞.大瑶山隧道的突泥涌水机制[J].铁道工程学报,1996,(2):83-89. (XU Ji-chuan, HUANG Shao-xia. Mechanism of Mud and Water Burst in Dayao Mountain Tunnel[J]. Journal of Railway Engineering Society, 1996, (2): 83-89.(in Chinese))
[2] ZANG C W, HUANG H W, ZHANG Z X. Forecasting the Strata Condition of a Long Road Tunnel by Using Fuzzy Synthetic Judgment[J]. International Journal of Rock Mechanics Sciences, 2004,41(3): 406-407.
[3] 齐传生,王洪勇. 圆梁山隧道综合超前地质预报技术[J].铁道勘察,2004,(5):52-56. (QI Chuan-sheng, WANG Hong-yong. Technique of Comprehensive Geological Prediction in Yuanliangshan Tunnel[J]. Railway Investigation and Surveying, 2004, (5):52-56.(in Chinese))
[4] 曲海峰,刘志刚,朱合华. 隧道信息化施工中综合超前地质预报技术[J].岩石力学与工程学报,2006,25(6):1246-1250. (QU Hai-feng, LIU Zhi-gang, ZHU He-hua. Technique of Synthetic Geologic Prediction Ahead in Tunnel Informational Construction[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(6): 1246-1250.(in Chinese))
[5] 邓世坤,王惠濂.探地雷达图像的正演合成与偏移处理[J].地球物理学报,1993,36(4):528-535. (DENG Shi-kun, WANG Hui-lian. Forward Synthesizing and Migration Processing for GPR Image[J]. Chinese Journal of Geophysics, 1993, 36(4):528-535.(in Chinese))
[6] 吴宝杰.探地雷达二维正演模拟及其工程实例[D].杭州:浙江大学,2007. (WU Bao-jie. Two-dimensional Forward Simulation of Ground Penetrating Radar and Engineering Examples[D]. Hangzhou: Zhejiang University,2007.(in Chinese))
[7] 赵宇.GPR及TSP在隧道超前地质预报中的解译标志研究[D].成都:成都理工大学,2009. (ZHAO Yu. Study on the Interpretation of GPR and TSP in Tunnel Geological Forecast[D]. Chengdu: Chengdu University of Technology, 2009.(in Chinese))
[8] 赵峰,周斌,武永胜.探地雷达在隧道衬砌空洞检测的正演模拟应用研究[J].铁道建筑,2012,(8):99-103. (ZHAO Feng, ZHOU Bin, WU Yong-sheng. Study on Application of Forward modeling of Inspecting Void in Tunnel Lining by Ground Probing Radar[J]. Railway Engineering, 2012, (8): 99-103.(in Chinese))
[9] 胡俊,俞祁浩,游艳辉,等.探地雷达在多年冻土区正演模型研究及应用[J].物探与化探,2012,36(3):457-460. (HU Jun, YU Qi-hao, YOU Yan-hui, et al. Study and Application of Ground Penetration Radar to the Forward Modeling of Permafrost Area[J]. Geophysical & Geochemical Exploration, 2012, 36(3): 457-460.(in Chinese))
[10]孙忠辉,刘金坤,张新平,等. 基于GprMax的隧道衬砌地质雷达检测正演模拟与实测数据分析[J].工程地球物理学报, 2013, 10(5):730-735. (SUN Zhong-hui, LIU Jin-kun, ZHANG Xin-ping,et al.The Tunnel Lining Detection Forward Numeral Simulation and Measured Data Analysis Based on GprMax[J]. Chinese Journal of Engineering Geophysics, 2013, 10(5): 730-735.(in Chinese))
[11]周奇才,李炳杰,郑宇轩,等.基于GPRMax2D的探地雷达图像正演模拟[J].工程地球物理学报,2008,5(4):396-399. (ZHOU Qi-cai, LI Bing-jie, ZHENG Yu-xuan, et al. Forward Simulation of GPR Image Based on GPRMax2D[J]. Chinese Journal of Engineering Geophysics, 2008, 5(4): 396-399.(in Chinese))
[12]YEE K S. Numerical Solution of Initial Boundary Value Problem Involving Maxell’s Equations in Isotropic Media[J]. IEEE Transactions on Antennas and Propagation,1966, 14(3): 302-307.
[13]喻振华,冯德山,戴前伟,等. 复杂地电模型的探地雷达时域有限差分正演[J].物探化探计算技术,2005,27(4):279-283. (YU Zhen-hua, FENG De-shan, DAI Qian-wei,et al.FDTD Method Forward Simulation of the Complex Geoelectricity GPR Model[J]. Computing Techniques for Geophysical and Geochemical Exploration, 2005, 27(4): 279-283.(in Chinese))
[14]冯德山,戴前伟,何继善,等. 探地雷达GPR正演模拟的时域有限差分实现[J].地球物理学进展,2006,21(2):630-636. (FENG De-shan, DAI Qian-wei, HE Ji-shan,et al.Finite Difference Time Domain Method of GPR Forward Simulation[J]. Progress in Geophysics, 2006, 21(2): 630-636.(in Chinese))
[15]何兵寿, 张会星. 地质雷达正演中的频散压制和吸收边界改进方法[J].地质与勘探,2000,36(3):59-63. (HE Bing-shou, ZHANG Hui-xing. The Suppression of Numerical Dispersion and Improvement of Absorbing Boundary Conditions in Forward Modeling of GPR[J]. Geology and Prospecting, 2000, 36(3): 59-63.(in Chinese))
[16]BERENGER J P. A Perfectly Match Layer for the Absorption of Electromagnetic Waves[J]. Journal of Computation Physics, 1994, 114(2): 185-200.
[17]HASTINGS F D, SCHNEIDER J B, BROSCHAT S L. Application of the Perfectly Matched Layer(PML) Absorbing Boundary Condition to Elastic Wave Propagation[J]. The Journal of the Acoustical Society of America, 1996, 100(5): 3061-3069.
[18]凌飞,肖宏跃,朱夏乐,等. 基于黏弹性介质的隧道地震二维正演模拟[J].长江科学院院报, 2015,32(5):121-126. (LING Fei, XIAO Hong-yue, ZHU Xia-le, et al. Two-dimensional Forward Seismic Modeling for Tunnel Based on Viscoelastic Medium[J]. Journal of Yangtze River Scientific Research Institute, 2015,32(5):121-126.(in Chinese))
[19]吕乔森, 徐颖, 胡志强. 提高隧道地震波地质预报(TSP)精度方法研究[J].长江科学院院报,2012,29(12):41-45. (LV Qiao-sen, XU Ying, HU Zhi-qiang. Methods of Improving Tunnel Seismic Prediction Accuracy[J]. Journal of Yangtze River Scientific Research Institute, 2012, 29(12): 41-45.(in Chinese))