Study of the Evolution Characteristics of Microseismic Events during the Excavation of Underground Caverns under High Geostress
Abstract
:1. Introduction
2. Project Overview
2.1. Project Background
2.2. Geological Structure and Geostress
3. Evolution Characteristics of MS Events during the Excavation of the Underground Powerhouse under High Geostress
3.1. Construction of the MS Monitoring System
3.2. Temporal Distribution Characteristics of MS Events
3.3. Spatial Distribution Characteristics of MS Events
3.4. Analysis of MS Evolutionary Responses to Construction Dynamics
4. FLAC-Based 3D Numerical Modeling
4.1. Numerical Model
4.2. Calculation Results
5. Conclusions
- An MS monitoring system was built during the excavation of the underground powerhouse at the Shuangjiangkou hydropower station. The temporal distribution pattern of the MS events was obtained during the excavation of benches I and II of the underground powerhouse from 19 July 2018 to 31 October 2020. The study reveals that MS events occurred frequently during the excavation of bench I, with an average of more than nine events in a single day. Moreover, the MS events still appeared during the support period when the blasting was stopped, indicating that the surrounding rock experienced a long stress adjustment under high geostress. However, the MS events occurred less frequently overall during the excavation of bench II due to the stress release and minor disturbance from the blasting, with an average of less than five events in a single day. The spatial distribution pattern of the MS events indicates that the high ground stress environment usually had a large number of MS events. There were three concentration zones of MS events with large energy and high moment magnitude, which are closely related to the construction dynamics and planes of geological structures.
- The intensive blasting and construction periods from 19 July 2018 to 3 December 2018 were selected to examine the dynamic relationship between the evolution of the MS events, the site construction conditions, and the geological structures. In summary, site blasting construction was the main factor inducing MS events in and around underground caverns under high geostress. The distribution of the MS events were strongly correlated with the location of the site blasting. Moreover, the frequency of the MS events was positively correlated with that of the blasting. The number of MS events was increased by the structural plane. The possibility of the surrounding rock becoming unstable was raised by the structural plane.
- The simulated maximum cross-sectional displacement of each turbine generally appeared near the spandrel during the excavation of the underground powerhouse for bench I. The maximum displacement occurred in the vicinity of the lamprophyre dyke near the upstream spandrel. The numerical modeling results closely matched the MS monitoring data and the site failure status of the rock mass. The failure and deformation of the rock mass were greatly impacted by the geological structure of the underground powerhouse under high geostress.
Author Contributions
Funding
Institutional Review Board Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Fault/Joint | Location Depth in the SPD9 Adit | Attitude | Fracture Zone Width | Angle of Intersection with the Plant Axis |
---|---|---|---|---|
SPD9-F1 | 504–505.5 m | N79°W/SW∠48° | 50–60 cm | 69° |
SPD9-f2 | 625 m | N33°W/NE∠88° | 80–140 cm | 23° |
Lamprophyre dyke | 380–395 m | N35°–50°W/SW∠72°–75° | 80–110 cm | 25°–40° |
J1 | N20°–50°E/SE∠25°–42° | 30°–60° | ||
J2 | N5°–26°E/NW∠10°–30° | 15°–36° | ||
J3 | N50°–75°W/SW∠58°–75° | 60°–85° | ||
J4 | N60°–80°E/NW∠5°–15° | 50°–80° | ||
J5 | N50°–60°E/SE∠45°–65° | 40°–50° |
Stress Classification | Maximum Principal Stress Level σm (MPa) | Rock Strength–Stress Ratio Rb/σm |
---|---|---|
Very high | σm ≥ 40 | <2 |
High | 20 ≤ σm < 40 | 2–4 |
Moderate | 10 ≤ σm < 20 | 4–7 |
Low | σm < 10 | >7 |
Parameter Category | Density (g/cm3) | Bulk Modulus (GPa) | Shear Modulus (GPa) | Poisson’s Ratio | Cohesion (MPa) | Internal Friction Angle (°) | Tensile Strength (MPa) |
---|---|---|---|---|---|---|---|
IIIa | 2.55 | 29.2 | 13.5 | 0.25 | 1.5 | 45 | 6.5 |
Structural Plane | Normal Stiffness (GPa/m) | Shear Stiffness (GPa/m) | Cohesion (MPa) | Internal Friction Angle (°) | Tensile Strength (MPa) |
---|---|---|---|---|---|
SPD9-F1 | 6 | 3 | 0.05 | 20 | 0.05 |
SPD9-F2 | 6 | 3 | 0.05 | 20 | 0.05 |
Lamprophyre dyke | 10 | 5 | 0.1 | 25 | 0.1 |
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Lin, X.; Li, B.; Li, P.; Ding, Q.; Huang, M. Study of the Evolution Characteristics of Microseismic Events during the Excavation of Underground Caverns under High Geostress. Appl. Sci. 2022, 12, 12145. https://doi.org/10.3390/app122312145
Lin X, Li B, Li P, Ding Q, Huang M. Study of the Evolution Characteristics of Microseismic Events during the Excavation of Underground Caverns under High Geostress. Applied Sciences. 2022; 12(23):12145. https://doi.org/10.3390/app122312145
Chicago/Turabian StyleLin, Xin, Biao Li, Peng Li, Quanfu Ding, and Mengting Huang. 2022. "Study of the Evolution Characteristics of Microseismic Events during the Excavation of Underground Caverns under High Geostress" Applied Sciences 12, no. 23: 12145. https://doi.org/10.3390/app122312145
APA StyleLin, X., Li, B., Li, P., Ding, Q., & Huang, M. (2022). Study of the Evolution Characteristics of Microseismic Events during the Excavation of Underground Caverns under High Geostress. Applied Sciences, 12(23), 12145. https://doi.org/10.3390/app122312145