A stress transfer-based tunnel surrounding rock structure layer quantitative characterization method and system

By calculating the ratio of compressive stress rise and strain energy abrupt change in the surrounding rock of the tunnel, the inner and outer boundaries of the surrounding rock structural layer of the tunnel are determined, solving the problem of quantitative characterization of the surrounding rock structural layer of the tunnel and improving the safety and applicability of tunnel construction.

CN116644633BActive Publication Date: 2026-07-21BEIJING JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING JIAOTONG UNIV
Filing Date
2023-05-30
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing technologies make it difficult to quantitatively characterize the surrounding rock structure of tunnels, especially under non-static water and non-circular excavation boundary conditions, where the stress state of the surrounding rock changes in a complex manner and there is a lack of objective and unified quantitative characterization methods, which makes it difficult to guarantee the safety of tunnel construction.

Method used

By acquiring stress change data of stress elements at any point in the tunnel surrounding rock, calculating the compressive stress rise ratio (RMSI-CS), and combining it with the folding abrupt change of strain energy in the tunnel surrounding rock, the inner boundary of the tunnel surrounding rock structure is determined, and the outer boundary of the tunnel surrounding rock structure is determined based on the spatial distribution of the compressive stress rise ratio, thus achieving accurate quantitative characterization.

Benefits of technology

It enables accurate quantitative characterization of the surrounding rock structure layer of tunnels, improves the safety of tunnel construction, is applicable to different tunnel excavation scenarios, and has good engineering practicality.

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Abstract

The application discloses a tunnel surrounding rock structure layer quantitative characterization method and system based on stress transfer, relates to the technical field of tunnel engineering, and comprises the following steps: acquiring stress change data sets corresponding to stress units at any point of tunnel surrounding rock; selecting the maximum stress change data from the stress change data sets and calculating the compressive stress increase ratio according to the maximum stress change data; determining the inner boundary of the tunnel surrounding rock structure based on the folding mutation of the internal strain energy of the tunnel surrounding rock and in combination with the compressive stress increase ratio of the stress units at any point of the tunnel surrounding rock; determining the outer boundary of the tunnel surrounding rock structure based on the spatial distribution of the compressive stress increase ratios of the stress units in the tunnel surrounding rock; and determining the tunnel surrounding rock structure layer according to the inner boundary of the tunnel surrounding rock structure and the outer boundary of the tunnel surrounding rock structure. The application realizes accurate quantitative characterization of the tunnel surrounding rock structure layer.
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