Method for determining flatness ratio of shallow and long-span city tunnel

Abstract

The invention discloses a method for determining the flatness ratio of a shallow and long-span city tunnel. The method includes the following steps that geological conditions of a stratum of a project are hierarchically generalized according to engineering geological investigation results; a grid model is built through numerical analysis software to simulate the tunnel construction process under the flatness ratio condition, and mechanical responses of the stratum and a supporting structure are solved; according to the requirements for the building safety and the building economical efficiency of the shallow and long-span city tunnel and environment influence control over the shallow and long-span city tunnel, an optimized objective function is proposed, and a result is simulated according to numerical values. The calculation flow of the analytic hierarchy process mainly includes the steps of building a hierarchical structure model; building a pairwise comparison judgment matrix; carrying out single hierarchical arrangement and a consistency check of the single hierarchical arrangement; carrying out comprehensive hierarchical arrangement and a consistency check of the comprehensive hierarchical arrangement. Parameter influence factors under different flatness ratios are analyzed with the analytic hierarchy process, weight comparison and calculation among multiple parameters are achieved, and a simple and convenient evaluation method is provided for multi-target or multi-criteria or structural-characteristic-free complex decision making problems.

Description

technical field [0001] The invention belongs to the technical field of mechanical analysis of underground engineering of urban tunnels, and in particular relates to a method for determining the flatness ratio of shallow-buried large-span urban tunnels. Background technique [0002] With the rapid development of my country's urbanization process, in order to improve the urban road network and alleviate the congestion pressure of urban ground traffic, the construction of underground roads in major cities in China is on the rise. According to incomplete statistics, Shanghai currently has as many as 16 urban underground roads under construction or has been built, making it the city with the most underground roads in China. According to the "Beijing Master Plan (2004-2020)", the expressways in the central area of ​​Beijing should form an overall network system. The underground expressway system is an important part of the system, and the two-horizontal and four-vertical undergro...

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Problems solved by technology

[0005] The emergence and research of urban underground road tunnels in my country started relatively late, coupled with the characteristics of poor geological conditions, many surrounding environmental constraints, and more complex structural forms and mechanical characteristics. In the research stage of exploration while constructing, theoretical research lags behind the development of engineering construction needs

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