Optimization of Smooth Blasting Parameters in Hard Rock Section of Qinling Mabaishan Tunnel
Smooth blasting is the main construction method for hard rock tunnel excavation.Due to the complex rock breaking mechanism,such as unreasonable design of blasting parameters,it is likely to make smooth blasting forming control difficult for hard rock tunnels.The surrounding rock of Qinling Mabaishan Tunnel on Xi'an-Shiyan HSR is mainly Yanshanian granite,and the Class Ⅱ and Ⅲ surrounding rocks account for more than 70％of the whole tunnel.This paper takes this tunnel project as the study background,focuses on the problems of tunnel overbreak and underbreak and secondary blasting construction after blasting in the original scheme,uses ANSYS/LS-DYNA finite element software for numerical simulation of smooth blasting forming control,analyzes the stress wave propagation law and surrounding rock damage in hard rock tunnel blasting,reveals the stress evolution characteristics and deformation failure law of hard rock under blasting disturbance,puts forward optimization measures for smooth blasting parameters,and effectively improves the blasting effect.The research achievements can provide reference for the design and construction of full-face smooth blasting excavation parameters in similar hard rock tunnels.
Xi'an-Shiyan HSRMabaishan Tunnelsmooth blastinghard rock massparameter optimizationnumerical simulation
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