A Calculation Method of Earth Pressure in Railway Tunnel Portal

A calculation method and earth pressure technology, applied in calculation, special data processing applications, instruments, etc., can solve the problems of unscientific and reasonable, lack of research data, etc., and achieve the effect of clear calculation process and general calculation formula

Inactive Publication Date: 2017-05-17
SOUTHWEST JIAOTONG UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

With the development of high-speed railways and double-track railways, the structural changes in the span of portals and other aspects are increasing. It is obviously unscientific and reasonable to simply use the empirical strip method to design new portals. relatively lacking

Method used

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  • A Calculation Method of Earth Pressure in Railway Tunnel Portal
  • A Calculation Method of Earth Pressure in Railway Tunnel Portal
  • A Calculation Method of Earth Pressure in Railway Tunnel Portal

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Embodiment Construction

[0029] The earth pressure calculation method of the railway tunnel portal of the present invention calculates the soil pressure distribution line pattern on the back of the tunnel portal wall as Figure 4 As shown, in the earth pressure distribution line type, the apex of the inner contour of the lining is the main key point. In order to calculate the earth pressure at the back of the tunnel door wall at this point, the lateral pressure coefficient is calculated first. Lateral pressure coefficient calculation formula:

[0030]

[0031]

[0032] In the formula: ω——breaking angle (°);

[0033] - calculated friction angle of surrounding rock (°);

[0034] ε——upward slope angle (°);

[0035] α——Inclination angle of wall back (°).

[0036] image 3 middle h 4 、h 5 and h 6 The calculation process is as follows:

[0037]

[0038] h 5 = h 1 +h+h 2 + h 3 -b-h 4 (4)

[0039]

[0040] Where a is the horizontal clear distance from the toe of the upward slope t...

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Abstract

The invention discloses a method for calculating the earth pressure of a railway tunnel door, which comprises the following steps: (1) establishing a calculation model of the earth pressure of the tunnel door structure; (2) determining the basic parameters for calculating the earth pressure; (3) determining the calculation of the earth pressure Involved in the size parameters of the tunnel door; (4) Calculation of soil pressure distribution on the back of the wall; (5) Calculation of the resultant force of the earth pressure on the back of the wall; (6) Calculation of the height of the action point of the resultant force of the earth pressure on the back of the wall. Bounded by the vertex of the inner contour of the lining, the soil pressure distribution line type of the back of the tunnel door wall is a quadratic curve above the vertex of the inner contour of the lining, and a vertical straight line below this point, and the vertical straight line passes through the curve of the quadratic curve. vertex. The invention substitutes the basic parameters required for the calculation of the earth pressure of the tunnel door into the calculation formula, and can calculate the magnitude of the earth pressure on the back of the wall, the resultant force and the position of the action point. It is simple to operate, easy to use, and has a high degree of programming. The calculation of the earth pressure of the door is easy to popularize and improve work efficiency.

Description

technical field [0001] The invention relates to a method for calculating the earth pressure of a gate of a railway tunnel, in particular to the calculation of the earth pressure at the back of the gate of a double-track and long-span railway tunnel. Background technique [0002] Tunnel portal is a support structure built with masonry at the entrance of the tunnel and decorated with architecture. It connects the tunnel lining and road cutting, and is the main component of the entire tunnel structure. In the tunnel doors in general areas, the tunnel door structures mainly include end wall type, column type, wing wall type, step type and so on. Since the tunnel portal is a structure that supports the upward slope of the front of the portal and the side slope of the cutting, the end wall and the wing wall of the portal can be regarded as the retaining wall structure with the back of the wall bearing the earth pressure. In the past, portals were designed according to retaining ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 周佳媚蒙国往申玉生严启王英学胡瑶瑶冯天炜常效境马敏
Owner SOUTHWEST JIAOTONG UNIV
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