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

A flat rate, urban technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as poor geological conditions, lagging theoretical research, and many surrounding environmental constraints

Active Publication Date: 2016-02-10
BEIJING UNIV OF TECH
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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 constrai

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

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Embodiment Construction

[0059] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0060] The urban area of ​​Beijing is located on the back of the alluvial alluvial fan of the Yongding River. The surface layer is alluvial deposits of the Quaternary Period, mainly consisting of sandy pebbles, sandy silt and cohesive soil in interlayer distribution, and the structure is relatively regular. Through the geological survey of the geological conditions of Beijing urban area, the stratigraphic sequence of the whole area mainly includes the artificial filling layer, the recent sedimentary layer, the upper layer of the Quaternary sedimentary layer, the lower layer of the Quaternary sedimentary layer, and the Tertiary sedimentary rock. In order to facilitate calculation and analysis without loss of generality, this paper generalizes stratigraphic distribution in urban areas of Beijing, as shown in figure 2 shown.

[0061] According to the geologica...

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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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Application Information

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IPC IPC(8): G06F17/50
Inventor 李鹏飞王帆张成平王华川魏盼刘宏川
Owner BEIJING UNIV OF TECH
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