Method for solving surrounding rock stress and displacement of shallow-buried tunnel in cavern-containing stratum under action of gravity

Abstract

The invention provides a method for solving surrounding rock stress and displacement of a shallow-buried tunnel of a cavern-containing stratum under the action of gravity. The method comprises the following steps: calculating a complex potential analytic function of surrounding rock stress and displacement of the shallow-buried tunnel under the action of gravity field stress release load; calculating additional surface force caused by the tunnel on the boundary of the cavity; calculating a surrounding rock stress and displacement complex potential analytic function of the cavity under the action of the additional surface force; calculating an additional surface force caused by the cavity on the tunnel boundary; calculating a surrounding rock stress and displacement complex potential analytic function of the tunnel under the action of the accessory surface force; repeatedly executing the processing process until a set stop condition is met; and superposing the complex potential analyticfunction obtained by previous iteration to obtain a final complex potential analytic function of the surrounding rock stress and displacement of the shallow-buried tunnel and a final calculation formula of the surrounding rock stress and displacement. According to the method, the mutual influence between the tunnel and the cavity can be considered; gravity field stress release in the tunnel excavation process can be considered, the solving efficiency is high, and the solving precision is good.

Description

Technical field [0001] The invention relates to the technical field of urban underground tunnels, in particular to a method for solving the stress and displacement of the surrounding rock of a shallow tunnel with a cavity under the action of gravity. Background technique [0002] my country is in the process of rapid urbanization. The population in the core area of ​​the city is growing rapidly. The traffic pressure facing the city is becoming increasingly prominent, and it has even become a major bottleneck factor in urban development. As an efficient, punctual, and large-volume transportation method, the subway is widely used in major cities in China, and the number of subway tunnels will greatly increase in the future. Urban subway tunnels have the following characteristics: [0003] ① Generally, the buried depth is shallow, and gravity is the main external load. [0004] ②The stratum deformation generated during the construction process is easily transmitted to the surrounding ...

AI Technical Summary

Problems solved by technology

[0004] ②The ground deformation generated during the construction process is easily transmitted to the surrounding buildings (structures), thereby endangering the safety of the surrounding buildings (structures)

[0007] ① When using the empirical prediction method, the main parameters need to be determined manually, which is greatly influenced by the experience of engineers. The empirical method can only predict the formation deformation, and the empirical method cannot reveal the mechanical mechanism of the formation deformation

[0008] ②Although the numerical simulation method can fully display the surrounding rock stress and displacement, the modeling process of the numerical simulation method is slow, the simulation parameters and methods are subject to the subjective influence of engineers, the repeatability is poor, and the numerical calculation takes a long time , cannot quickly evaluate the project

[0009] ③Existing theories are mostly aimed at a single tunnel, rarely considering the influence of stratum cavities, and rarely considering the gravity factor

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