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Research on inversion and application of failure depth of coal seam roof and floor based on triangular network acoustic CT tomography

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Abstract

Acoustic tomography is an important test method in engineering geology and underground engineering, however, the problems of model parameterization, forward modeling and inversion in the process of tomographic imaging still need further study. In this work, the triangulation method of two-dimensional complex area was studied and the global algorithm of triangular ray tracing in two-dimensional complex area was formulated. Numerical simulation results of triangular acoustic ray tomography show that with the increase of iteration times, the ray tracing becomes increasingly close to the ray-tracing forward from the velocity model; through seven iterations, the low-speed plate with a thickness of only 0.56 m can also be clearly reflected. Besides, based on triangular ray-tracing tomography of the two-dimensional complex structure, the deep acoustic detection of coal seam floor failure zone is carried out. After the initial velocity model is determined by the single-hole acoustic detection results, the velocity distribution of the floor between holes is obtained by triangular network acoustic tomography from the premining, mid-mining and postmining acoustic penetration detection. Field measurements show that the 17-m-span acoustic wave penetration is successfully realized in sandstone and mudstone strata of coal seam floor, with accurate delineation of the development range of water-conducting fissures in floor failure. The triangular acoustic tomography method makes full use of the characteristics of flexible model division and makes the imaging results appear closer to the actual structural morphological characteristics.

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Acknowledgements

This research was supported by joint funding by, the Natural Science Foundation of Shandong Province (ZR2019QEE041), the National Natural Science Foundation of China (51904172), Research Fund of The State Key Laboratory of Coal Resources and safe Mining, CUMT(SKLCRSM18KF013), Supported by SDUST Research Fund(2017RCJJ009), and the Qingchuang Science and Technology Program of Shandong Province University (2019KJG008). The authors would like to thank the reviewers and editors who presented critical and constructive comments for the improvement of this paper. We also wish to thank K. Anand Kumar and SISTRANS Editorial Services for improving the language of this paper.

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Authors and Affiliations

  1. College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China

    Shijian Yu, Xiaoying Zhang & Biao Kong

  2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China

    Shijian Yu & Biao Kong

  3. Tengzhou City Jixiang (Group) Jisuo Coal Mine, Zaozhuang, 277100, China

    Bin Zhang

  4. College of CiviI and Structural Engineering, Shandong University of Science and Technology, Qingdao, 266590, China

    Biao Kong

  5. State Key Laboratory of Mining Disaster Prevention and Control Co-founded By Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China

    Biao Kong

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  1. Shijian Yu
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  2. Xiaoying Zhang
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Correspondence to Biao Kong.

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Yu, S., Zhang, X., Zhang, B. et al. Research on inversion and application of failure depth of coal seam roof and floor based on triangular network acoustic CT tomography. Environ Earth Sci 79, 337 (2020). https://doi.org/10.1007/s12665-020-09090-4

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