Blasting Vibration Safety Criterion Analysis with Equivalent Elastic Boundary: Based on Accurate Loading Model
In the tunnel and underground space engineering, the blasting wave will attenuate from shock wave to stress wave to elastic seismic wave in the host rock. Also, the host rock will form crushed zone, fractured zone, and elastic seismic zone under the blasting loa...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Hindawi Limited
2015-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2015/604683 |
| Summary: | In the tunnel and underground space engineering, the blasting wave will attenuate from shock wave to stress
wave to elastic seismic wave in the host rock. Also, the host rock will form crushed zone, fractured zone, and elastic seismic
zone under the blasting loading and waves. In this paper, an accurate mathematical dynamic loading model was built. And the
crushed zone as well as fractured zone was considered as the blasting vibration source thus deducting the partial energy for cutting host rock.
So this complicated dynamic problem of segmented differential blasting was regarded as an equivalent elastic boundary problem by taking advantage
of Saint-Venant’s Theorem. At last, a 3D model in finite element software FLAC3D accepted the constitutive parameters, uniformly distributed
mutative loading, and the cylindrical attenuation law to predict the velocity curves and effective tensile curves for calculating safety criterion formulas of
surrounding rock and tunnel liner after verifying well with the in situ monitoring data. |
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| ISSN: | 1070-9622 1875-9203 |