- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | WANG Junlou, WANG Bo, DU Jiamin, YAN Jian, XU Juncheng, XU Guowen. Pressure Arch and Surrounding Rock Pressure in Mechanized Tunnels with Drilling and Blasting Method[J]. Journal of Southwest Jiaotong University, 2025, 60(6): 1433-1446. doi: 10.3969/j.issn.0258-2724.20240442
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The evolution mechanism and development patterns of the pressure arch during the mechanized excavation process of tunnels using the drilling and blasting method hold significant importance for tunnel load calculation and stability assessment. A typical double-track tunnel on the Chongqing–Kunming High Speed Railway was selected as the research subject. By employing methods such as numerical simulation and field tests and fitting the control points corresponding to the inner boundary points, outer boundary points, arch springing line, and the positions of the “arch springing” of the pressure arch, a comprehensive determination of the pressure arch boundary in mechanized tunnels was achieved. Additionally, the formation and development patterns of the pressure arch during the excavation of mechanized tunnels using the drilling and blasting method were ascertained. Meanwhile, based on the characteristics of the pressure arch, a theoretical calculation model for surrounding rock pressure was derived. The conclusions are as follows: As the lateral pressure coefficient $\lambda $ increases, the area of increased strain energy in the surrounding rock during mechanical excavation shows an evolutionary pattern of transition from the side wall (lateral pressure coefficient $ \lambda = 0.5 $), the excavation contour around the tunnel ($ \lambda = 1.0 $), and the vault ($ \lambda = 1.5 $, farther away from the excavation contour). During tunnel excavation, the overall changes in radial and tangential stresses in the surrounding rock exhibit a narrowing trumpet shape. When $ \lambda = 0.5 $, the strain energy accumulates near the contour of the excavation face of the tunnel and eventually concentrates within the surrounding rock of the haunch. The error between the calculated value of the vault surrounding rock pressure and the field test result is less than 10%. Compared with the recommended formula in the
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