Design and stability analysis of full-hall scaffolding for secondary lining in large-section shafts
ZHANG Xiaolong1, GUO Mingyao1, XIANG Yu2*
1. Shanghai Tunnel Engineering Rail Transit Design and Research Institute, Shanghai 200235, China; 2. School of Resource and Safety Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract: Aiming at the lack of systematic research on temporary support system design for secondary lining in large-section and deep shafts, this study investigated the feasibility and stability of the full-hall scaffolding method, using Shaft No. 3 of the Xiaping drainage system in Shenzhen as the engineering case. Based on standardized design codes, a scaffolding scheme and key reinforcement measures suitable for deep shafts were developed. A three-dimensional finite-element model of the disk-coupler steel-tube scaffold was established in MIDAS/CIVIL, incorporating typical construction load cases including concrete lateral pressure, structural self-weight, and operational loads. Member stresses, displacements, and linear buckling modes were analyzed. The model accuracy was validated using monitoring data. Results showed that under the maximum construction load, the vertical post exhibits a maximum axial stress of 34.72 MPa, the maximum displacement at the horizontal joint reaches 21.17 mm, and all modal critical load factors exceeded 4, satisfying the safety reserve requirements specified in current codes. The findings demonstrated methodological and practical innovations: the study not only filled the gap in research on the mechanical behavior and stability of full-hall scaffolding in deep-shaft conditions, but also provided technical references and engineering experience for the design and wider application of large-section temporary support systems in underground construction.
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2025, Vol. 7 
