Microseismic Event Location by Considering the Influence of the Empty Area in an Excavated Tunnel
The velocity model is a key factor that affects the accuracy of microseismic event location around tunnels. In this paper, we consider the effect of the empty area on the microseismic event location and present a 3D heterogeneous velocity model for excavated tunnels. The grid-based heterogeneous vel...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-01-01
|
| Series: | Sensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1424-8220/20/2/574 |
| _version_ | 1798041314736996352 |
|---|---|
| author | Pingan Peng Yuanjian Jiang Liguan Wang Zhengxiang He |
| author_facet | Pingan Peng Yuanjian Jiang Liguan Wang Zhengxiang He |
| author_sort | Pingan Peng |
| collection | DOAJ |
| description | The velocity model is a key factor that affects the accuracy of microseismic event location around tunnels. In this paper, we consider the effect of the empty area on the microseismic event location and present a 3D heterogeneous velocity model for excavated tunnels. The grid-based heterogeneous velocity model can describe a 3D arbitrarily complex velocity model, where the microseismic monitoring areas are divided into many blocks. The residual between the theoretical arrival time calculated by the fast marching method (FMM) and the observed arrival time is used to identify the block with the smallest residual. Particle swarm optimization (PSO) is used to improve the location accuracy in this block. Synthetic tests show that the accuracy of the microseismic event location based on the heterogeneous velocity model was higher than that based on the single velocity model, independent of whether an arrival time error was considered. We used the heterogeneous velocity model to locate 7 blasting events and 44 microseismic events with a good waveform quality in the Qinling No. 4 tunnel of the Yinhanjiwei project from 6 June 2017 to 13 June 2017 and compared the location results of the heterogeneous-velocity model with those of the single-velocity model. The results of this case study show that the events located by the heterogeneous velocity model were concentrated around the working face, which matched the actual conditions of the project, while the events located by the single-velocity model were scattered and far from the working face. |
| first_indexed | 2024-04-11T22:19:50Z |
| format | Article |
| id | doaj.art-16754303411446ed83233f1c82043077 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T22:19:50Z |
| publishDate | 2020-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-16754303411446ed83233f1c820430772022-12-22T04:00:14ZengMDPI AGSensors1424-82202020-01-0120257410.3390/s20020574s20020574Microseismic Event Location by Considering the Influence of the Empty Area in an Excavated TunnelPingan Peng0Yuanjian Jiang1Liguan Wang2Zhengxiang He3School of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaThe velocity model is a key factor that affects the accuracy of microseismic event location around tunnels. In this paper, we consider the effect of the empty area on the microseismic event location and present a 3D heterogeneous velocity model for excavated tunnels. The grid-based heterogeneous velocity model can describe a 3D arbitrarily complex velocity model, where the microseismic monitoring areas are divided into many blocks. The residual between the theoretical arrival time calculated by the fast marching method (FMM) and the observed arrival time is used to identify the block with the smallest residual. Particle swarm optimization (PSO) is used to improve the location accuracy in this block. Synthetic tests show that the accuracy of the microseismic event location based on the heterogeneous velocity model was higher than that based on the single velocity model, independent of whether an arrival time error was considered. We used the heterogeneous velocity model to locate 7 blasting events and 44 microseismic events with a good waveform quality in the Qinling No. 4 tunnel of the Yinhanjiwei project from 6 June 2017 to 13 June 2017 and compared the location results of the heterogeneous-velocity model with those of the single-velocity model. The results of this case study show that the events located by the heterogeneous velocity model were concentrated around the working face, which matched the actual conditions of the project, while the events located by the single-velocity model were scattered and far from the working face.https://www.mdpi.com/1424-8220/20/2/574heterogeneous velocity modelmicroseismic event locationexcavated tunnelfast marching method |
| spellingShingle | Pingan Peng Yuanjian Jiang Liguan Wang Zhengxiang He Microseismic Event Location by Considering the Influence of the Empty Area in an Excavated Tunnel Sensors heterogeneous velocity model microseismic event location excavated tunnel fast marching method |
| title | Microseismic Event Location by Considering the Influence of the Empty Area in an Excavated Tunnel |
| title_full | Microseismic Event Location by Considering the Influence of the Empty Area in an Excavated Tunnel |
| title_fullStr | Microseismic Event Location by Considering the Influence of the Empty Area in an Excavated Tunnel |
| title_full_unstemmed | Microseismic Event Location by Considering the Influence of the Empty Area in an Excavated Tunnel |
| title_short | Microseismic Event Location by Considering the Influence of the Empty Area in an Excavated Tunnel |
| title_sort | microseismic event location by considering the influence of the empty area in an excavated tunnel |
| topic | heterogeneous velocity model microseismic event location excavated tunnel fast marching method |
| url | https://www.mdpi.com/1424-8220/20/2/574 |
| work_keys_str_mv | AT pinganpeng microseismiceventlocationbyconsideringtheinfluenceoftheemptyareainanexcavatedtunnel AT yuanjianjiang microseismiceventlocationbyconsideringtheinfluenceoftheemptyareainanexcavatedtunnel AT liguanwang microseismiceventlocationbyconsideringtheinfluenceoftheemptyareainanexcavatedtunnel AT zhengxianghe microseismiceventlocationbyconsideringtheinfluenceoftheemptyareainanexcavatedtunnel |