Abstract
In order to analyze the mechanical behavior of surrounding rock and initial support during shaft excavation and support process, reveal the law of stratum displacement, the stress characteristics of surrounding rock and the internal force of supporting structure during construction, this paper establishes a three-dimensional finite element numerical model relying on the construction process of a ventilation shaft in Chongqing Rail Transit. The results show that the stress of shotcrete, the bending moment of supporting structure, the axial force of bolt and the axial force of I-beam are all within the allowable range. The "S" shape bending occurs in the range of 60m~70m for the axial force of bolt and cross brace I-beam. According to the results of model test, there is inflection point in the pressure distribution of rectangular deep ventilation shaft in rail transit, which provides a basis for the support design of deep ventilation shaft.
Highlights
Based on the construction process of a ventilation shaft in Chongqing Rail Transit, this paper studies the
When the actual construction of the shaft reaches the position where the bending moment is larger, the support should be strengthened to avoid the cracking of the tension side caused by the excessive bending moment of the initial supporting concrete, which will affect the stability and safety of the shaft
The vertical bending moment of the long side of the shaft is mainly negative, and the initial support of the shaft is mainly tensioned in the inside of the pit and compressed in the outside
Summary
Based on the construction process of a ventilation shaft in Chongqing Rail Transit, this paper studies the. The design and calculation of supporting structure of rectangular ventilation shaft in urban rail transit are mostly based on the design method of deep foundation pit. There are few studies on rectangular deep ventilation shaft in rail transit, and the lateral pressure of surrounding rock and the mechanical behavior of supporting structure of rectangular deep shaft mechanical behavior of supporting structure of rectangular ventilation deep shaft. It provides a reference for the design and construction of similar projects.
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