Abstract As a technical method, the mechanized construction of D&B tunnels, which is based on the matching of high-efficiency large-scale machinery in full process, is intended to solve various construction problems of long and large mountain tunnels in complex mountainous areas with the goal of safety, quality, efficiency and economy. This paper discusses the two key challenges faced by mechanized construction of tunnels by drilling and blasting method,i.e. safety control of the tunnel face and deformation control of the tunnel body from the perspective of the design,and summarizes the key design technologies for mechanized construction of tunnels by drilling and blasting method,including the full-face mechanized construction technology in various geological conditions, the assessment method of tunnel face stability, the active advance support technology of tunnel face, the "quantified" accurate design technology of active advance support, the active support technology with low prestressed anchor bolts, the active support technology with early high-strength shotcrete, the fast-closing technology of primary support ring, and the calcula? tion method for deformation pressure of surrounding rocks, which can provide technical supports for the promotion and application of mechanized construction method in D&B tunnels.
Abstract：
As a technical method, the mechanized construction of D&B tunnels, which is based on the matching of high-efficiency large-scale machinery in full process, is intended to solve various construction problems of long and large mountain tunnels in complex mountainous areas with the goal of safety, quality, efficiency and economy. This paper discusses the two key challenges faced by mechanized construction of tunnels by drilling and blasting method,i.e. safety control of the tunnel face and deformation control of the tunnel body from the perspective of the design,and summarizes the key design technologies for mechanized construction of tunnels by drilling and blasting method,including the full-face mechanized construction technology in various geological conditions, the assessment method of tunnel face stability, the active advance support technology of tunnel face, the "quantified" accurate design technology of active advance support, the active support technology with low prestressed anchor bolts, the active support technology with early high-strength shotcrete, the fast-closing technology of primary support ring, and the calcula? tion method for deformation pressure of surrounding rocks, which can provide technical supports for the promotion and application of mechanized construction method in D&B tunnels.
CHEN Guodong1 GAN Mufei2 LIU Ke2
.Key Design Technologies for Mechanized Construction of Railway Tunnels by Drilling and Blasting Method[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(2): 200-209
2022, Vol. 59 