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Abstract ：
There have been ever more in-situ tunnel extension projects due to the growing demand for transportation. The traditional blast scheme requires a large quantity of explosive and the vibration effect is hard to control. In order to reduce explosive consumption and the vibration effect, an optimized non-cut blast scheme was proposed and applied to the in-situ expansion of the Gushan Tunnel. Refined numerical simulation was adopted to compare the traditional and optimized blast schemes. The vibration attenuation within the interlaid rock mass and the vibration effect on the adjacent tunnel were studied and compared. The simulation results were validated by the field monitoring of the vibration effect on the adjacent tunnel. Both the simulation and the monitoring results showed that the vibration velocity on the adjacent tunnel's back side was much smaller than its counterpart on the blast side, i.e., the presence of cavity reduced the blasting vibration effect significantly. The optimized non-cut blast scheme, which effectively utilized the existing free surface, could reduce the explosive consumption and vibration effect significantly, and might be preferred for in-situ tunnel expansion projects.
Keyword ：
field monitoring field monitoring in-situ tunnel expansion in-situ tunnel expansion non-cut blast scheme non-cut blast scheme numerical simulation numerical simulation vibration effect vibration effect
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| GB/T 7714 | Guan, Zhenchang , Xie, Lifu , Chen, Dong et al. Numerical Simulation and Field Monitoring of Blasting Vibration for Tunnel In-Situ Expansion by a Non-Cut Blast Scheme [J]. | SENSORS , 2024 , 24 (14) . |
| MLA | Guan, Zhenchang et al. "Numerical Simulation and Field Monitoring of Blasting Vibration for Tunnel In-Situ Expansion by a Non-Cut Blast Scheme" . | SENSORS 24 . 14 (2024) . |
| APA | Guan, Zhenchang , Xie, Lifu , Chen, Dong , Shi, Jingkang . Numerical Simulation and Field Monitoring of Blasting Vibration for Tunnel In-Situ Expansion by a Non-Cut Blast Scheme . | SENSORS , 2024 , 24 (14) . |
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Abstract ：
The complex geological condition encountered during excavation is the key challenge for tunneling projects. Therefore, tunnel design and construction require a comprehensive understanding of the subsurface geology. This study aims to reveal the effect of geological uncertainty on tunnel longitudinal deformation based on a reconstruction geological model using the improved coupled Markov chain method. The improved coupled Markov chain method makes the predicted results more suitable for the possible stratigraphic distribution by optimizing the transition probability matrix, and breaks through the limitations of non-coaxial predicted cell updating in traditional methods. A mapping method was proposed to establish a matching relationship between the irregular grids of the geological model and the numerical tunnel model. Then, a long tunnel in Shenzhen was selected as a case study to demonstrate the effectiveness of the proposed framework. The correlation coefficient was used to verify the relationship between tunnel deformation and the surrounding stratum with different tunnel cover depths. The geological uncertainty of various strata was quantitatively measured based on the proposed geological uncertainty index. The three-dimensional strata surrounding the tunnel were reconstructed based on exceedance probabilities for adverse geological conditions. Quantitative analysis was conducted on the tunnel vertical convergence during the excavation process.
Keyword ：
Coupled Markov chain Coupled Markov chain Geological uncertainty Geological uncertainty Shield tunnel Shield tunnel Three-dimensional Three-dimensional
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| GB/T 7714 | Jiang, Qi-Hao , Zhang, Jin-Zhang , Zhang, Dong -Ming et al. Influence of geological uncertainty on longitudinal deformation of tunnel based on improved coupled Markov chain [J]. | ENGINEERING GEOLOGY , 2024 , 337 . |
| MLA | Jiang, Qi-Hao et al. "Influence of geological uncertainty on longitudinal deformation of tunnel based on improved coupled Markov chain" . | ENGINEERING GEOLOGY 337 (2024) . |
| APA | Jiang, Qi-Hao , Zhang, Jin-Zhang , Zhang, Dong -Ming , Huang, Hong-Wei , Shi, Jing-Kang , Li, Zhang-Li . Influence of geological uncertainty on longitudinal deformation of tunnel based on improved coupled Markov chain . | ENGINEERING GEOLOGY , 2024 , 337 . |
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