Integral anti-slip design method for wing-wall tunnel doors

Abstract

The overall anti-slip design method of the wing-wall tunnel door improves the stability and safety factor of the tunnel door, makes the design accurate and reliable, and effectively saves the amount of concrete masonry for the door. It includes the following steps: (1) Determine the basic calculation data, including stratum characteristic parameters, building material physical parameters and stability coefficient K0; (2) Determine the size of each part of the portal; (3) For the entire end wall, wing wall and other Divide the contacted wall back soil into strips, and divide several wall strips and wall back soil strips; (4) Calculation of soil pressure distribution on the end wall; (5) Calculation of sliding resultant force; (6) Anti-slipping resultant force Calculation; (7) Anti-slip checking calculation.

Description

technical field [0001] The invention relates to an anti-slip overall design method for tunnel portals, which is particularly suitable for the anti-slip design of wing-wall-type portals in railways, highways, and hydraulic tunnels. Carry out anti-overturning design. Background technique [0002] Tunnel door is a support structure built by masonry and decorated with architectural decoration at the entrance of the tunnel. It is connected with the tunnel lining and road cutting, and is the main component of the entire tunnel structure, as well as the symbol of the entrance and exit of the tunnel. Wing wall tunnel door is a type of tunnel door that is often used. It is widely used in the opening support of railways, highways, hydraulic tunnels and underground structures. In the anti-slip design of wing wall tunnel doors in the past, At home and abroad, the tunnel door wing wall is usually regarded as a retaining wall structure, and the design is approximated by the strip method....

AI Technical Summary

Problems solved by technology

This conventional design method originated from the standard design of railway tunnel portals compiled in the 1950s in my country. It has great disadvantages both in theory and in engineering applications, and is obviously unreasonable and uneconomical.

Since the portal is closely connected to the lining and embedded in the cutting slope, its stress condition is much better than that of the general retaining wall. However, the original design method used a narrow strip to calculate the thickness of the wing wall separately, without considering the relationship between the end wall and the lining of the portal. The combined effect and various favorable factors did not consider the wing wall as a whole structure, which is obviously unreasonable in theory

At the same time, through decades of engineering practice, it has been shown that the wing walls of the portal built according to the original design method seldom overturned and damaged, which shows that the actual safety degree of the previously designed portal is too high, and there is a large safety margin, resulting in masonry and other damages. Waste of building materials, poor social and economic benefits

With the development of social economy and technological progress, there are more and more applications of high-speed and long-span railway tunnels, and the performance of building materials has also been greatly improved. The tunnel diameter, door thickness and overall performance have been greatly improved From the perspective of economy and rationality, the original anti-slip design method of the portal is no longer suitable for the current technology and social and economic development, and it is necessary to make inventions and innovations in design methods

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