Details

Autor(en) / Beteiligte

• Hu, Qi-zhi
• Zhang, Rui
• Gao, Yong
• Hong, Chang-wei

Titel

Study on the response mechanism of tunnel blasting dynamics and the spatial variation characteristics of the surrounding rock

Ist Teil von

• IOP conference series. Earth and environmental science, 2020-06, Vol.510 (5), p.52067

Ort / Verlag

Bristol: IOP Publishing

Erscheinungsjahr

2020

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• The construction of the new Orfa drill explosion is the main method of tunneling in mountainous areas at present, and the vibration waves produced by blasting have a great influence on the deformation and stability of the surrounding rock. Based on the tunnel project at the Dalong Expressway in Guizhou, China, the vibration and deformation parameters of the surrounding rock in the blasting construction process are monitored, and the dynamic response mechanisms are studied. Simulations are carried out using the FLAC3D software, and actual measurements of the deformation of the surrounding rock are compared with the results from the numerical simulations. The results show that the blasting parameter is the key influencing factor that determines the blasting power effect. The maximum displacement of the surrounding rock under blasting action occurs in the vault. The displacement area can be divided into five affected regions that show obviously different displacement degrees, where more deformation occurs for surrounding rock that is located closer to the explosion source. Of the three investigated waveforms, all show decreased displacement with distance. However, the exponential load waveform can more effectively represent the spatial variability characteristics of the surrounding rock than the other two load waveforms, where the simulated deformations obtained with this waveform are similar to those of the actual working conditions.