Research on the Surrounding Rock Damage of Deep Hard Rock Tunnels Caused by Bottom Excavation

Zhen Wang; Chu Nan Tang; Tian Hui Ma; Lian Chong Li; Yue Feng Yang

doi:10.4028/www.scientific.net/AMM.170-173.1700

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Research on Techniques and Experiments of Electrostatic Radon Elimination in Underground Engineering
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The Study on Soil Pressure on Embankment Culvert under High-Fill
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Research on the Surrounding Rock Damage of Deep Hard Rock Tunnels Caused by Bottom Excavation
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Contrast Analysis on Deformation Characteristic of Urban Subway Tunnel Excavation by Numerical Simulation and Field Measurement
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Safety Study on Connection Joint for Submerged Floating Tunnel
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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 170-173Research on the Surrounding Rock Damage of Deep...

Research on the Surrounding Rock Damage of Deep Hard Rock Tunnels Caused by Bottom Excavation

Abstract:

The damage features of surrounding rock in the process of bottom excavation in deep hard rock tunnel were investigated, combining with the actual tunnel data of JinpingⅡHydropower Station and using numerical simulation approach. The evolution mechanism of microfractures initiation, growth and expansion in deep intact rock mass was performed. It’s shown that the fractures caused by bottom excavation develop to deeper surrounding rock due to stress adjustment, and the zone that have been supported also has some damage. The research results provide important references to understand the damage features of surrounding rock in deep hard rock under high geostress.