Theoretical analysis of equivalent hydrostatic stress attenuation in surrounding rocks after excavation
| Autor: | Jinchan He, Mengze Yang, Yu Yang, Yidan Sun |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010504 meteorology & atmospheric sciences
Logarithm Attenuation Excavation In situ stress Elasticity (physics) 010502 geochemistry & geophysics 01 natural sciences Energy conservation General Earth and Planetary Sciences Geotechnical engineering Hydrostatic stress Geology 0105 earth and related environmental sciences General Environmental Science Dimensionless quantity |
| Zdroj: | Arabian Journal of Geosciences. 13 |
| ISSN: | 1866-7538 1866-7511 |
| DOI: | 10.1007/s12517-020-05528-y |
| Popis: | Energy concentration and redistribution are always accompanied by tunnel deformation and failure. This study uses a plain-strain model of circular openings under high in situ stress to derive the energy of the surrounding rocks before and after excavation based on elasticity. The study focuses on determining the areal extent of the surrounding rock significantly affected by the excavation. The relationship between dimensionless zonal radius ri/a and dimensionless stress σ0/R0 is determined based on two principles: (1) energy conservation and (2) the logarithmic relationship between consumed energy and the scale of fragmentation. The law of attenuation of stress in surrounding rock during the process of zonal fracture is theoretically explained. Preliminary values for the unknown parameters in the given formula are proposed using the data available, and the stress attenuation law corresponding to the given tunnels is presented. |
| Databáze: | OpenAIRE |
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