Tunnel reservation deformation amount step-by-step reservation construction method

By using a step-by-step pre-construction method, the actual pre-deformation of each part of the tunnel was calculated and the pre-deformation of the entire ring was optimized. This solved the problem of uneven deformation caused by geological factors during tunnel construction, and achieved stability of the tunnel structure and savings in construction costs.

CN116877086BActive Publication Date: 2026-06-30CHINA RAILWAY 11TH BUREAU GRP CORP LTD +1
View PDF 2 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA RAILWAY 11TH BUREAU GRP CORP LTD
Filing Date
2023-06-07
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

During tunnel construction, due to adverse geological factors such as shallow burial, bias pressure, and high ground stress, the initial support deformation of the tunnel is uneven, resulting in non-smooth steel supports, loose connecting plates, stress concentration, and serious local over-excavation or encroachment.

Method used

The step-by-step pre-reservation construction method is adopted. By collecting the cumulative deformation of each part of the same cross section of the tunnel, the deformation coefficient of each part is calculated. The actual reserved deformation is calculated according to the formula. The reserved deformation of the whole ring is optimized by using a three-dimensional laser scanner to ensure that the deformation of each part is uniform and to avoid inflection points and local over-excavation.

Benefits of technology

This achieved uniform deformation across all parts of the tunnel, avoiding uneven arch connections and localized over-excavation, saving construction costs, and ensuring the stability of the tunnel structure and construction efficiency.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN116877086B_ABST
    Figure CN116877086B_ABST
Patent Text Reader

Abstract

A method for pre-excavating tunnel deformation allowance in stages involves first excavating a pre-excavation section of the tunnel in three stages (upper, middle, and lower) and constructing surrounding rock support. During excavation, a full-ring pre-excavation allowance is made according to the initial pre-excavation allowance. Then, the cumulative deformation of the arch and each stage in the same cross-section of the pre-excavation section is collected, and the location with the largest cumulative deformation is selected. The deformation coefficient of each location is then calculated. Based on the pre-excavation allowance calculation formula, the actual pre-excavation allowance for each part of the tunnel is calculated. This design first obtains the deformation coefficient of each location based on the degree of deformation, fully understanding the deformation law of the surrounding rock. Then, based on the deformation coefficient of each location and the full-ring pre-excavation allowance, the actual pre-excavation allowance for different excavation locations in the same cross-section is calculated. The stage-based pre-excavation allowance ensures that the final deformation of each stage after excavation is uniform, guaranteeing the smoothness of the arch connection while avoiding local over-excavation, effectively controlling excessive consumption of tunnel lining concrete, and saving construction costs.
Need to check novelty before this filing date? Find Prior Art