首页|In-situ observations of damage-fracture evolution in surrounding rock upon unloading in 2400-m-deep tunnels
In-situ observations of damage-fracture evolution in surrounding rock upon unloading in 2400-m-deep tunnels
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The damage-fracture evolution of deep rock mass has obvious particularity, which is revealed in 2400-m-deep tunnels by field tests. The evolution of the excavation damaged zone depth is consistent with that of the fractured zone depth. The ratio of the excavation damaged zone depth to the excavation fractured zone depth is greater than 2.0 in a rock mass with both high strength and good integrity, but less than 1.5 in a rock mass with lower strength or poor integrity. Zonal disintegration in a rock mass with high strength and fair integrity is more likely to occur when it contains more than two groups of primary frac-tures in damaged zones. Fractures develop outward in zonal disintegration but are totally different from the single-zone fracture, in which the fractures develop inward, and it is the starting position of the frac-tured zone when the excavation surface of the middle pilot is 7–9 m close to the pre-set borehole and it stops after the excavation surface of the baseplate is 11–14 m away. The most intense evolution occurs around 2–4 m from the pre-set borehole in the sidewall expansion stage. The research results provide a reference for the monitoring scheme and support design of CJPL-Ⅲ in its future construction.
Deep tunnelFractured zoneDamaged zoneIn-situ observationUnloading of rock mass
Jiangxi Key Laboratory of Disaster Prevention-mitigation and Emergency Management,Nanchang 330013,China
Key Laboratory of Geological Hazards on Three Gorges Reservoir Area,Ministry of Education,Yichang 443002,China
College of Civil Engineering and Architecture,China Three Gorges University,Yichang 443002,China
State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China
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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaProject of Youth Inno vation Promotion Association of Chinese Academy of SciencesOpen Research Fund of Key Laboratory of Geological Hazards on Three Gorges Reservoir Area(China Three Gorges University)Ministry of Education
NETL
NSTL
万方数据
维普
