Shield tunnel pipe piece designing method taking double-liquid synchronous grouting layer performance degradation into consideration

Abstract

The invention discloses a shield tunnel pipe piece designing method taking double-liquid synchronous grouting layer performance degradation into consideration. The method comprises a first step of determining different distributing patterns of gel calcium silicate in cement-water glass double liquid based on careful observation and analysis, a second step of calculating occurrence frequency, occupied area proportion and structural effect influence coefficient of the gel calcium silicate in different distributing patterns, a third step of carrying out discount calculation on the mechanical property of the cement-water glass double liquid which is degraded by the gel calcium silicate according to a calculated result, and a fourth step of calculating the internal force and the deformation of a shield tunnel pipe piece lining structure by the adoption of the modified routine method. By means of the method, an accurate and effective evaluation can be carried out on the long-term mechanical property of the cement-water glass double liquid which is degraded by the gel calcium silicate which is a reaction product of the double liquid, then the evaluation is carried out on the long-term safety performance of a tunnel structure and other building structures using the cement-water glass double liquid, the method is used for designing shield tunnel pipe pieces, and the result is realer and more reliable.

Description

technical field [0001] The invention relates to a shield tunnel segment design method, in particular to a shield tunnel segment design method considering the performance degradation of a double liquid grout synchronous grouting layer. Background technique [0002] Cement-water glass double-liquid slurry (referred to as double-liquid slurry) is a grouting formed by adding cement and water glass as the main agent, and the two are injected in a double-liquid manner according to a certain ratio. Material. This kind of slurry overcomes the shortcomings of single-liquid cement slurry (referred to as single-liquid slurry), which have long setting time and is difficult to control, and low calculus rate under dynamic water conditions. It expands the application range of grouting and improves the grouting effect. [0003] For the synchronous grouting of the shield tail of the shield tunnel, single grout is mostly used in China at present. Generally, the single-liquid slurry is bette...

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Problems solved by technology

As for the rock formation, since the disturbed rock formation is relatively dense, it is difficult for the grout to diffuse into it, which cannot improve the physical and mechanical parameters of the surrounding rock; and the physical and mechanical parameters such as the resistance coefficient and strength of the grouting circle are also higher than those of the initial surrounding rock. Low mechanical parameters

[0014] In traditional shield tunnel segment design, the initial physical and mechanical parameters of the stratum where the shield tunnel is located are used to calculate the stratum resistance coefficient, and the influence of the grouting circle on the stratum resistance is not considered, which is inconsistent with the actual situation in most cases. tends to be conservative for rock formations and dangerous for rock formations

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