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Article

Stability Analysis of Surrounding Rock in Multi-Discontinuous Hydraulic Tunnel Based on Microseismic Monitoring

1
Chn Energy Dadu River Jinchuan Hydropower Construction, Jinchuan 624100, China
2
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
3
School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
4
Chn Energy Dadu River Shuangjiangkou Hydropower Construction, Ma’erkang 624099, China
5
PowerChina Chengdu Engineering Co., Ltd., Chengdu 610072, China
6
State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, China
*
Author to whom correspondence should be addressed.
Academic Editor: Fabrizio Balsamo
Appl. Sci. 2022, 12(1), 149; https://doi.org/10.3390/app12010149
Received: 21 November 2021 / Revised: 19 December 2021 / Accepted: 21 December 2021 / Published: 24 December 2021
(This article belongs to the Special Issue Structural Geology, Rock Mechanics and Their On-Site Testing Analysis)
The diversion tunnel of a hydropower station is characterized by low quality surrounding rock and weak structural planes. During excavation, rock mass spalling and cracking frequently occur. To evaluate the stability of a rock mass during tunnel excavation, high-precision microseismic monitoring technology was introduced to carry out real-time monitoring. Based on the temporal and spatial distribution characteristics of microseismic events, the main damage areas and their influencing factors of tunnel rock mass were studied. By analyzing the source characteristic parameters of the concentration area of microseismic activities, the rock fracture mechanism of the concentration area was revealed. The 3D numerical model of diversion tunnel was established, and the deformation characteristics of the rock mass under the control of different combination types of weak structural planes were obtained. The results showed that the microseismic event was active between 29 October 2020 and 6 November 2020, and the energy release increased sharply. The main damage areas of the rock mass were located at Stakes K0 + 500–K0 + 600 m. Microseismic source parameters revealed that shear failure or fault-slip failure induced by geological structures had an important influence on the stability of the surrounding rock. The numerical simulation results were consistent with the microseismic monitoring results and indicated that among the three kinds of structural plane combination types, including “upright triangle”, “inverted triangle” and “nearly parallel”, the “upright triangle” structure had the most significant influence on the stability of the surrounding rock. In addition, the maximum displacement of the surrounding rock had a trend of lateral migration to the larger dip angle in the three combined structural plane types. The research results will provide significant references for the safety evaluation and construction design of similar tunnels. View Full-Text
Keywords: hydraulic tunnel; microseismic monitoring; structural plane; numerical simulation; surrounding rock stability hydraulic tunnel; microseismic monitoring; structural plane; numerical simulation; surrounding rock stability
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MDPI and ACS Style

Zhou, X.; Li, B.; Yang, C.; Zhong, W.; Ding, Q.; Mao, H. Stability Analysis of Surrounding Rock in Multi-Discontinuous Hydraulic Tunnel Based on Microseismic Monitoring. Appl. Sci. 2022, 12, 149. https://doi.org/10.3390/app12010149

AMA Style

Zhou X, Li B, Yang C, Zhong W, Ding Q, Mao H. Stability Analysis of Surrounding Rock in Multi-Discontinuous Hydraulic Tunnel Based on Microseismic Monitoring. Applied Sciences. 2022; 12(1):149. https://doi.org/10.3390/app12010149

Chicago/Turabian Style

Zhou, Xiang, Biao Li, Chunming Yang, Weiming Zhong, Quanfu Ding, and Haoyu Mao. 2022. "Stability Analysis of Surrounding Rock in Multi-Discontinuous Hydraulic Tunnel Based on Microseismic Monitoring" Applied Sciences 12, no. 1: 149. https://doi.org/10.3390/app12010149

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