Abstract
Relying on the entrance section of a high-speed railway tunnel blasting project, the fluid-solid coupling algorithm based on ANSYS/LS-DYNA was used to optimize the parameters of wedge cut blasting, and the vibration could be reduced on the basis of ensuring the blasting effect. Through the combination of visual numerical simulation results and rock-breaking mechanism of wedge cut blasting, the maximum vibration velocity of different monitoring points in the model under different segmented time delay was analyzed. The results show that the best method for detonation is dividing the blastholes into three segments from upper to lower and dividing the left and right symmetrical blastholes into one segment. When the delay time is 10 ms, the average vibration reduction ratio is the best, which is reduced by 18% compared with the six-hole simultaneous blasting. In addition, the actual surrounding rock stress has a clamping effect on the cut blasting area. The wedge cut blasting footage obtained by numerical simulation was basically consistent with the field results, which proved that the model is reasonable and effective. This study intuitively and accurately demonstrated the process of cut blasting, the superposition curve of vibration velocity and the vibration reduction results under different delay times, and the effect of cut blasting. The results can be directly applied to similar projects, and the optimal blasting parameters and related issues can be solved more accurately with the help of this engineering analysis method.
Highlights
In the process of tunnel construction, mechanical excavation methods such as Tunnel Boring Machines (TBM) have disadvantages such as high maintenance investment, inconvenient distribution of equipment parts, difficulty in assembly on-site, and poor adaptability to various types of surrounding rock. e drilling and blasting method, which is another tunnel excavation method, has significant advantages such as better geological adaptability and less equipment investment
The trend graph of the average vibration reduction ratio can be obtained: From Figure 15, it is clear that when the delay time is 10 ms, the vibration velocity generated by the explosive
No Surrounding Rock Stress Surrounding Rock Stress blasting of each segment is independent of the time axis, and the average vibration reduction rate reaches the highest value, up to 18%
Summary
In the process of tunnel construction, mechanical excavation methods such as Tunnel Boring Machines (TBM) have disadvantages such as high maintenance investment, inconvenient distribution of equipment parts, difficulty in assembly on-site, and poor adaptability to various types of surrounding rock. e drilling and blasting method, which is another tunnel excavation method, has significant advantages such as better geological adaptability and less equipment investment. E drilling and blasting method, which is another tunnel excavation method, has significant advantages such as better geological adaptability and less equipment investment It inevitably involves harmful effects such as earthquakes, noise, air shock waves, gun smoke, and blasting flying rocks. Combining existing research and using numerical simulation methods to systematically study the rockbreaking mechanism of wedge cut blasting, the detonation sequence and segmented delay time of cutting holes in the engineering project were optimized, and blasting vibration was reduced effectively on the premise of ensuring successful cutting. All blast holes on the upper steps were set to a reverse detonation design continuous charge structure, explosives were continuously packed along the axis of the blasthole, and the sealing quality should be ensured
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