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| Optimization study of blasting technology for deeply buried drainage trench in tunnel based on SPH-FEM coupled simulation |
| ZHANG Hailan1, WU Yunpeng1, ZOU Ren1, MA Xiaolong2, LI Kuntai3,GAO Qidong3*, NIU Lei4, ZHOU Haixiao3
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1. China Railway No.5 Engineering Group Co., Ltd., Changsha 410007, Hunan, China;
2. Qinghai Provincial Transportation Construction Management Co., Ltd., Xining 810008, Qinghai, China;
3. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China;
4. Lanzhou University of Technology, Lanzhou 730050, Gansu, China |
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Abstract To improve drainage efficiency and ensure tunnel operational safety, an SPH-FEM(smoothed particle hydrodynamics-finite element method)coupled computational model was established based on the construction of the Qinghai Saierlong No. 2 Tunnel. A comparison was made of rock damage evolution, blast-induced cavity dimensions, and rock ejection effects under different borehole arrangements(vertical drilling and wedge-shaped drilling). The research results showed that the overall extent of rock damage was generally consistent under both drilling patterns. However, wedge-shaped drilling was more prone to overbreak or underbreak at the trench bottom, which was unfavorable for blast-induced contour control. Although the blast contours were similar under both configurations, wedge-shaped drilling resulted in a larger cavity volume and a wider cavity opening compared to vertical drilling. The wedge-shaped drilling layout was optimized considering contour quality and particle ejection efficiency. This optimization reduced the particle ejection velocity while maintaining satisfactory contour formation and particle ejection quantity, thereby providing a reference for the efficient construction of deep-buried drainage ditches.
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Published: 19 September 2025
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