Method for measuring stability of partition wall in shallow-buried single-hole double-line bias tunnel

Abstract

The invention belongs to the technical field of tunnel engineering. The invention discloses a method for measuring the stability of a partition wall in a shallow-buried single-hole double-line bias tunnel. An instability evaluation method and checking calculation criteria for the partition wall in the single-hole double-line bias tunnel are established according to the change rule of surrounding rock bias stress transmitted by an upper lining on the partition wall and the composite effect of wind pressure generated in the tunnel driving process on the partition wall of the operating tunnel, and stability checking calculation of the bias partition wall is achieved; bias stress borne by surrounding rock on the upper portion of the single-hole partition wall and horizontal bias stress and vertical stress borne by the partition wall are combined, and then distribution and action modes of pneumatic wind pressure on the partition wall are considered in an overlapped mode; a composite stability determination method is derived and established based on bias voltage and wind pressure, and a K value stability coefficient is proposed for determining the stability of the partition wall. The method provided by the invention has a clear stability criterion, provides a basis for single-hole double-line bias tunnel evaluation and prevention and control, and has the characteristics of simplicity, convenience and practicability.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering stability evaluation, in particular to a method for measuring the stability of a partition wall in a shallow-buried single-hole double-line bias tunnel. Background technique [0002] At present, the closest existing technology: In the past ten years, along with the rapid development of China's economy, my country's subway tunnel construction has also entered a golden period of rapid growth. In many tunnel structure constructions, many projects are affected by terrain, Restricted by many factors such as geology, tunnels have to be built near slopes and at shallow depths. As a result, many special forms of tunnels have emerged, and shallow-buried bias-pressure tunnels are a representative one. The shallow or extremely shallow buried weak and broken surrounding rock tunnels are often accompanied by the danger of landslides, especially for the surrounding rock area at the top of the middle p...

AI Technical Summary

Problems solved by technology

By verifying the conclusions of the mathematical model and new mechanical laws, this method needs to consider materials, which is expensive, time-consuming and laborious; the finite element calculation model is divided into two-dimensional and three-dimensional

There are obvious deficiencies in the two-dimensional model, which cannot consider the space-time effect of construction

[0005] To sum up, the problem existing in the existing technology is that the existing technology is not widely used in the partition wall structure of the single-hole double-track shallow tunnel for the partition wall structure of the shallow-buried bias-pressure multi-arch tunnel, and is used for The wind pressure load was not considered in the stability analysis process of the partition wall, and the stability calculation results were inaccurate

[0006] Difficulty in solving the above technical problems: For the existing monitoring technology of the partition wall structure in a single-hole double-lane tunnel, there are only specific monitoring methods, no specific theoretical calculation and derivation, no consideration of the wind pressure factor, and relatively simple stability studies. The calculation method is clear, and the relevant data are not comprehensive for the research of this type of tunnel, and the existing research on the partition wall structure of the shallow-buried bias-pressure single-hole double-track tunnel is very scarce

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