| Autor: |
HUANG Dengxia, ZHOU Xiaolong, ZHAO Jian, CAI Yongshun, DAI Rui |
| Předmět: |
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| Zdroj: |
Nonferrous Metals (Mining Section); Nov2024, Vol. 76 Issue 6, p105-112, 8p |
| Abstrakt: |
To validate the feasibility of the microseismic monitoring in the early warning of rockburst in TBM excavation engineering, and to study the rockburst characteristics of surrounding rock, a newly developed microseismic(MS) monitoring system was employed in the Tianshan-Shengli tunnel to detect MS activities, and then to predict and warn the rockburst disasters. The system not only has the advantages of accuracy of artificial analysis, but also has the real-time analysis and early warning function of cloud service platform, of which positioning accuracy for MS events is about 5-10 m. The prediction criterion of rockburst risk level adopted multiple evaluation indexes such as energy, moment magnitude and quantity of MS events. It reveals that the evolution of maximum energy has a good positive correlation with that of maximum moment magnitude, through analyzing the monitored MS events. According to the field statistical results of rockburst information, the rockburst generally occurs two days after the rockmass is exposed from the tunnel boring machine (TBM) tail shield, which belongs to the delayed rockburst. The preliminary application cases indicate that the rockburst prediction and early warning based on MS monitoring can serve the safety construction of TBM excavation project well. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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