A Design and Analysis Method for Auxiliary Support System of Tunnel Steel Frame

Abstract

The invention relates to the field of tunnel engineering, in particular to a design and analysis method for an auxiliary support system of a tunnel steel frame. According to the action mechanism of the steel frame auxiliary support system, a mechanical analysis model of the steel frame auxiliary support system is established, and the force method can be used to obtain the foundation load, The settlement of the arch foot, the internal force of each section of the connecting longitudinal beam, the force and deformation of each lock foot member and its underlying foundation. Tunnel designers can use the foundation load of each arch foot of the obtained steel frame, the settlement of each arch foot, the internal force of each section of the connecting longitudinal beam, the force and deformation of the locking foot members and the underlying foundation, and analyze the steel frame under different working conditions. The bearing capacity of the arch foot foundation, the settlement of each arch foot, the strength of the connecting longitudinal beam and each locking foot member, and the bearing capacity of the underlying foundation of the locking foot member are checked and calculated, and the design of the steel frame auxiliary support system is finally completed.

Description

[0001] 1. Technical field: [0002] The invention relates to the field of tunnel engineering, in particular to a design and analysis method for an auxiliary support system of a tunnel steel frame. [0003] 2. Background technology: [0004] The steel frame is a commonly used primary support type for tunnels in weak and broken ground. Because of its high early rigidity, it can provide strong support for the surrounding rock immediately after erection. Therefore, the surrounding rock after the tunnel is excavated In terms of initial stability, the steel frame can play an important role. However, when investigating the collapse or substantial subsidence of the roof during the construction of tunnels in soft ground, the problems mostly occur on the arch foot support of the steel frame. For example, the insufficient bearing capacity of the arch foot foundation or the suspension of the arch foot will affect the arch foot of the steel frame. Stability is adversely affected. [0005]...

AI Technical Summary

Problems solved by technology

However, when investigating the collapse or substantial subsidence of the roof during the construction of tunnels in soft ground, the problems mostly occur on the arch foot support of the steel frame. For example, the insufficient bearing capacity of the arch foot foundation or the suspension of the arch foot will affect the arch foot of the steel frame. adverse effect on stability

[0005] The auxiliary support system of the steel frame is a commonly used control measure for the settlement of tunnel arch feet, but there is still a lack of a set of design analysis and evaluation methods for tunnel designers, resulting in blindness in the application only based on experience

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