|
|
Research and Application of Cross-hole Seismic Technology in Detailed Karst Detection |
LIU Zhenming |
China Railway Design Corporation, Tianjin 300251, China |
|
|
Abstract Research purposes: Cross-hole seismic technology plays an important role in the precise detection of karst in urban underground space, and is an important guarantee for the safety of urban underground space. However, it has been proven that cross-hole CT technology still has limitations such as large deviation in the identification of karst near the bedrock surface, missing of small cavities, and inability to detect large inclined interfaces or vertical banded karst caves. Based on cross-hole seismic CT technology, this paper introduces cross-hole seismic migration technology, and achieves good results in the trial calculation of diffraction model and karst cave model. The aim of the research is to apply cross-hole seismic migration technology to engineering practice, improve the degree of fine detection of karst and ensure the safety of major engineering construction. Research conclusions: (1)Cross-hole seismic migration technology can perform migration imaging on fine structures with arbitrary velocity changes, and the imaging results can accurately reflect the structural morphology, with higher resolution, which is feasible and superior in karst exploration.(2)In the engineering field, the cross-hole seismic migration technology has been implemented for the first time, effectively compensating for tomographic imaging errors caused by factors such as ray errors in cross-hole seismic CT technology, as well as improving the detection accuracy of karst spatial morphology.(3)The implementation of cross-hole seismic migration technology provides a theoretical basis for multi-attribute interpretation of cross-hole seismic data, which can reproduce the morphology and scale of karst development more realistically and provides a new idea for carrying out cross-hole seismic work in karst areas, with scientific significance and promotion value.
|
Received: 11 October 2023
|
|
|
|
|
[1] |
李坚.在建铁路隧道和路基基底岩溶物探技术探讨[J]. 铁道工程学报,2017(12):9-12.Li Jian.Exploration on the Karst Geophysical Exploration Technology of the Railway Tunnel and Subgrade Base under Construction[J].Journal of Railway Engineering Society,2017(12):9-12.
|
[2] |
刘振明,刘世奇,唐筱蛑. 地震CT结合地震映像法综合物探应用研究[J]. 铁道工程学报,2014(2):11-14.Liu Zhenming,Liu Shiqi,Tang Xiaosheng.Study on Application of Comprehensive Geophysical Exploration Combining Seismic Tomography with Seismic Imaging Method[J]. Journal of Railway Engineering Society,2014(2): 11-14.
|
[3] |
林松,王薇,金聪,等. 地震CT在岩溶精细探测中的应用与探讨:以深圳地铁14号线为例[J]. 科学技术与工程,2019(25):18-23.Lin Song, Wang Wei, Jin Cong, etc. Application andDiscussion of Seismic CT in Detailed Karst Detection:A Case of Shenzhen Metro Line 14[J].Science and Technology and Engineering, 2019(25): 18-23.
|
[4] |
朱文仲,赵志忠. 弹性波CT技术几个重要问题的研究[J]. 工程地球物理学报,2008(2):173-180.Zhu Wenzhong,Zhao Zhizhong.Study on Some Important Problems of Elastic Wave Computerized Tomography[J].Chinese Journal of Engineering Geophysics, 2008(2):173-180.
|
[5] |
刘振明,周学明. 逆时偏移技术在井间构造成像中的应用[J]. 物探化探计算技术,2011(S1): 196-199.Liu Zhenming,Zhou Xueming. The Application of Reverse-Time Migration on Cross-Well Structures Imaging[J]. Computing Techniques for Geophysical and Geochemical Exploration,2011(S1): 196-199.
|
[6] |
Liang-Zie Hu, George A,McMechan Jerry, etc. Acoustic Pre-stack Migration of Cross-hole Data [J]. Geophysics, 1988(8): 1015-1023.
|
[7] |
Balch A H,Chang H, Hofland G S, etc. Use of Forward- and Back-scattered P-,S- and Converted Waves in Cross-borehole Imaging [J]. Geophysical Prospecting, 1991(7): 887-913.
|
[8] |
周学明,李庆春,李志华,等.地震波交错网格高阶差分数值模拟研究[J].铁道工程学报,2011(8):1-6.Zhou Xueming, Li Qingchun, Li Zhihua, etc. Research on Staggered-grid High-order Finite-difference Numerical Simulation of Seismic Wave[J].Journal of Railway Engineering Society,2011(8):1-6.
|
|
|
|