Experimental Study and Engineering Application of the Spatial Reticulated Grid Bolt-Shotcrete Support Structure for Excavation Tunnels

Abstract

In view of the problems of rapid construction and deformation control of large cross-section tunnels in complex urban environments, the concept of “timely high-strength support” was put forward to form strong support over time and bear the load of surrounding rock in real time, and innovatively developed the spatial reticulated grid bolt-shotcrete support structure (SRGB). The research in this paper focuses on the supporting principle, bearing mechanical properties, snatch simulation test, construction process, and engineering application effects. The components of the SRGB and their respective functions were expounded in detail. The failure modes and deformation characteristics of the tested components were revealed through the indoor loading test, and the performance characteristics of the spatial reticulated grid concrete components with high strength and high rigidity were displayed. With the help of the multi-functional operation trolley, the assembly process test of the spatial reticulated grid was carried out, which verified the feasibility of mechanized construction and the rationality of structural design. Relying on the underground tunnel project of Guangzhou Metro, the spatial reticulated grid structure was successfully used as the initial support of the tunnel for the first time, forming a complete set of mechanized rapid construction technology for a large cross-section tunnel, and constructing a timely high-strength support system suitable for the complex urban environment. The research results provide a new idea and new technology for the mechanized rapid construction and efficient support of large cross-section tunnels.

Integrated Geophysical Analysis for Landslide Risk Mitigation: A Case Study on the Weak Zone Area of Jantho-Lamno Route, Aceh, Indonesia

“…Various slope protection methods were proposed for this sedimentary rock site, including shotcrete, wire mesh, net rock bolting, and targeted rock removal. Implementing a drainage system with proper gradient, asphalt layer application, and biotechnical slope protection were also suggested strategies [18,19,20]. These measures aimed to mitigate potential slope hazards and improve stability.…”

Evaluation of Excavation Ergonomics of Drill and Blast Method Based on Game Theory G2-EW-TOPSIS Model

“…This is contrary to the people-oriented and green development construction concept [6][7][8]. How do we improve the mechanization level of tunnel construction, reduce the labor intensity of construction personnel, and the comparison of mechanized construction ergonomics and manual construction ergonomics, which has been the focus of tunneling research [9][10][11][12]? Therefore, we need to establish a tunnel drilling and blasting excavation ergonomics evaluation ergonomics, and conduct a quantitative analysis and evaluation.…”

Advanced Underground Space Technology

“…Huang et al [17] design a high-strength and high-rigidity initial tunnel support structure based on the current situation of the construction of shallow-buried large-section tunnels in complex urban environments. The bearing characteristics and failure mechanism are analyzed through indoor model tests, and industrial tests are carried out, relying on the Guangzhou subway tunnel project to provide a reasonable new support type for urban shallow-buried large-section tunnels.…”