6/29/2023 0 Comments Is tunnelbear safe to use![]() used the numerical model to analyze the construction sequence, the time and method of secondary lining in three parallel tunnels with the middle one constructed first, as well as the impact of blasting the tunnels on both sides of the secondary lining of the middle tunnel in the parallel section of the Sunjiawan Tunnel 1 on the Yongzhou Highway and the Niupilingxia Tunnel on the Yongzhou Railway. adopted field monitoring and software simulation to study the influence of blasting from the rear tunnel on the structural optimization of the secondary lining of the advance tunnel under soft and broken surrounding rocks in the Xinmin Tunnel. ![]() used ANSYS to analyze the seismic impact of blasting excavation on the surface and concluded that the cavity effect caused the excavated surface to vibrate more quickly than the unexcavated surface. ![]() In the Aiminshan Tunnel in Dandong, Liaoning Province, Wang et al. also adopted FLAC3D in Hangzhou Metro Line 5 to analyze the blasting vibration in the excavation of small clear-distance tunnels to the support of the adjacent tunnel in an urban area. The result showed that the pure steel fiber concrete segment has better crack resistance, and it is feasible to replace steel. simulated the pure steel fiber segment of a hard rock tunnel through FLAC3D, and conducted field tests in Qingdao Metro Line 1. Qi and Liu studied the mechanical properties of fiber-reinforced concrete shield segments, and obtained that the bending, yield, and ultimate bending moment of the segments with fiber are significantly higher than those of ordinary segments under the same reinforcement ratio. Remarkable results have been made on the blasting construction of nearby tunnels.
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