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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.,Qinghai,810008,Xining, 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 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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Received: 01 April 2025
Published: 03 September 2025
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