Ocak and Bilgin studied the performance of a roadheader, impact hammer and drilling and blasting method in the excavation of metro station tunnels in Istanbul and gained machine utilization time and average net cutting rate of each machine. The empirical relationships between the scaled distance and peak particle velocity were established in order to predict the influence on neighboring buildings and structures.
Ozer analyzed the field-testing results of ground vibration induced by blasting during the construction of the Istanbul Kadikoy-Kartal metro tunnel. Tunnel behavior due to blast-induced vibration was investigated in terms of particle velocity, displacement, and stress of the linings, and guidelines for a blast protection zone were proposed. Modified the detonation pressure equation based on the results of field tests. Devised technological improvements to the structure and critical systems of the vehicle and tested in real situation, focused particularly on the behavior of people in blast situation, and presented the related improvements of the vehicles’ design in order to improve resilience and survivability to blast. Used a fully coupled technique involving smooth particle hydrodynamics and finite element techniques to investigate the blast response of segmented bored tunnels. The results suggested that the cavity effect on the ground only worked within a limited scope in shallow tunnel excavations, and an empirical equation was proposed to calculate the amplifying coefficient.
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Researched the impact of the cavity effect on tunnel excavation blasting vibration by a series of blast tests. However, most of these studies focus on the displacement and stability of foundation pit, and less attention has been paid to blasting engineering and blasting seismic wave influence on a metro tunnel. The abovementioned issue is a key technical issue in realizing the safe and efficient implementation of build foundation pit construction in complex urban environments.Īt present, research on the response characteristics of foundation pit on a metro tunnel has been widely considered by scholars. In order to ensure the safety and stability of the adjacent metro tunnel, the influence of the blasting vibration should be evaluated, and potentially damaging effects should be minimized. When the blasting vibration exceeds a certain limit, it can cause catastrophic damage to the lining. Most metro tunnels are lined with reinforced concrete segments. With the continuous construction of urban metro in China, dangers associated with the blasting excavation of foundation pits adjacent to existing urban metro often arise.
Blasting is an efficient and fast excavation method for hard rock mass, and it has been widely used in the excavation of urban building foundation pits.
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