Abstract
Microseismic (MS) monitoring is an effective and widely applied technology for early warning and prevention of rockburst disasters in deeply buried tunnels. The location of the microseismic source is the top priority of MS monitoring. However, an unknown complex and consistently changing velocity distribution of surrounding rocks is a major challenge for accurate MS source location. A real-time velocity inversion method of monitoring areas during tunnel drilling is urgently needed to provide a newly updated heterogenous velocity model. This paper develops a velocity inversion strategy for surrounding rocks using drilling and blasting seismic data. Inverted heterogeneous velocity models can be obtained at multiple construction stages with drilling. An L2 norm double-difference location method based on the simplex optimization method is provided for MS location using heterogeneous velocity models. Numerical studies test the accuracy of the proposed velocity inversion and MS location method. Noticeable improvement in location accuracy can be observed using updating inverted heterogeneous velocity models. Finally, we conducted a field experiment at two new tunnels with a burial depth of 2400 m in the China Jinping Underground Laboratory Phase II. Multiple blasting sources with known coordinates verified the performance of the proposed MS location method.
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Acknowledgements
The authors would like to gratefully acknowledge the support of the National Natural Science Foundation of China (Grant nos. 42172317 and 42207211) and the Innovation Group Project of the Natural Science Foundation of Hubei Province (ZRQT2020000114).
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Liu, L., Li, S., Xiao, Y. et al. An Inverted Heterogeneous Velocity Model for Microseismic Source Location in Deep Buried Tunnels. Rock Mech Rock Eng 56, 4855–4880 (2023). https://doi.org/10.1007/s00603-023-03305-3
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DOI: https://doi.org/10.1007/s00603-023-03305-3