Novel pipe-roof method for a super shallow buried and large-span metro underground station

Abstract

To address the inadequacies of traditional pipe-roof methods, the steel support cutting pipe method (SSCP)—a novel pipe-roof method that improves construction security and underground space usage—is proposed. To further explore the applications of SSCP, its design scheme ought to be optimized. The failure mode and mechanical behaviors of the SSCP were investigated through laboratory experiments. Subsequently, a series of finite element models (FEMs) was established to study the deformation characteristics. Further, the parameters of the steel support of the proposed structure were optimized using fuzzy mathematics. The results indicated the ultimate bearing capacity to be 366.8 kN, and the specimen began to yield when the external load reached 70% of the ultimate value. The longitudinal spacing of the steel supports, transverse steel support size, and vertical steel support size had significant effect on the vertical deformation of the steel support and the ground settlement. Finally, the optimal combination of steel supports for the SSCP structure was obtained.

Keywords

• Steel support cutting pipe method
• Ground settlement
• Deformation characteristics
• Fuzzy mathematical theory
• Parameter optimization