Tunnel structure toughness evaluation method considering soft rock aging characteristic

Through a tunnel structure evaluation method that takes into account the aging characteristics of soft rocks, the toughness index of the tunnel lining at different moments is calculated through the control index weight coefficient and three-dimensional surface fitting, which solves the problem that the existing technology is difficult to evaluate the toughness of the tunnel lining and response to external loads, and achieves a more comprehensive tunnel structure performance evaluation and design support.

CN119646934AActive Publication Date: 2025-03-18INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI +1
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Patent Information

Application Number
CN202411692507.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-25
Publication Date
2025-03-18
Estimated Expiration
2044-11-25

AI Technical Summary

Technical Problem

The existing tunnel structure evaluation method is difficult to consider the aging deformation of surrounding rocks, and it is impossible to effectively evaluate the toughness of the tunnel lining and its response ability to external loads during the operation period.

Method used

A tunnel structure toughness evaluation method considering the aging characteristics of soft rock is proposed. By selecting control indicators that affect the safety performance of lining, calculating its weight coefficient and performance indicators, drawing a three-dimensional scatter plot for three-dimensional surface fitting, calculating the volume of the space-time evolution surface and the time axis and space axis of the lining performance indicators, and then obtaining the toughness index of lining at different moments.

Benefits of technology

This method can more comprehensively characterize the stress state of the lining, reflect the unevenness of the force, provide a comprehensive performance indicator, evaluate the response of the lining to long-term loads, and provide technical support for the tough support design of soft rock tunnels.

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Abstract

The invention discloses a tunnel structure toughness evaluation method considering soft rock aging characteristics, and the method comprises the steps: obtaining a weight coefficient and a performance index through calculation, drawing a three-dimensional scatter diagram through the data of the performance index, and carrying out the three-dimensional curved surface fitting. Obtaining a lining performance index spatio-temporal evolution surface diagram; calculating to obtain a volume enclosed by the space-time evolution curved surface of the lining performance index considering the surrounding rock aging deformation, the time axis and the space axis, and a volume enclosed by the space-time evolution curved surface of the lining performance index not considering the surrounding rock aging deformation, the time axis and the space axis, and comparing the volumes to obtain a toughness index; and based on the obtained toughness index, calculating to obtain the overall toughness index of the interior and exterior of the lining. Compared with the prior art, the tunnel structure toughness evaluation method considering the soft rock aging characteristic has the advantages that the time-space evolution law of the stress of the lining is fully considered by considering the aging deformation of the surrounding rock, and a reliable calculation method can be provided for reasonably evaluating the long-term performance of the lining.
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