Numerical Simulation of Rock Blasting in a Pipe-Jacking Project of China

Authors: Li, YL; Chen, LB; Xu, AJ; Wang, JH; Zhang, LL Paper is not available for download Contact Us

DOI https://doi.org/10.36487/ACG_repo/808_172

Cite As:
Li, YL, Chen, LB, Xu, AJ, Wang, JH & Zhang, LL 2008, 'Numerical Simulation of Rock Blasting in a Pipe-Jacking Project of China', in Y Potvin, J Carter, A Dyskin & R Jeffrey (eds), SHIRMS 2008: Proceedings of the First Southern Hemisphere International Rock Mechanics Symposium, Australian Centre for Geomechanics, Perth, pp. 103-112, https://doi.org/10.36487/ACG_repo/808_172



Abstract:
A new water supply system will be constructed across the Shantou Bay, in Shantou, Guangdong Province, China using the pipe-jacking technique. According to the site investigation, a section with a total length of 50 m along the planned pipe line is composed of decomposed granite rock. Drill and blasting will be adopted to excavate these rocks. One concern about the application of blasting in this pipe-jacking project is that the pipe-jacking machine is very close to the rock surface to be blasted and may be destroyed by the excessive explosive pressure from blasting. The surrounding sea mud and decomposed rocks, which were improved by jet grouting, may collapse after blasting. To evaluate the impact of blasting on the pipe-jacking machine and the surrounding ground, numerical simulations are conducted to investigate the response of the pipe-jacking machine and the rock damage under the conditions with explosives embedded at different depths of blast holes. Four cases with the explosive materials buried at various depths were analysed. It was found that the maximum displacement of the auger head of the pipe-jacking machine after 60 ms of the initiation of detonation is reduced with the increase of buried depth of explosives. It means that if the explosives are embedded into deeper depth of the rocks, the impact on the pipe-jacking machine can be reduced. The simulation dynamic responses of the surrounding rocks are also presented in this paper.

References: