A method and apparatus for evaluating the load bearing capacity and failure behavior of thin sprayed materials

By using an assessment method and device to simulate rockfall scenarios in tunnels, we have achieved accurate assessment of the load-bearing capacity of thin-film sprayed materials, overcoming the shortcomings of traditional testing methods, providing scientific data support, and improving the safety of applications in tunnel engineering.

CN122385378APending Publication Date: 2026-07-14CHINA UNIV OF MINING & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA UNIV OF MINING & TECH
Filing Date
2026-05-15
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Existing technologies cannot accurately assess the load-bearing capacity and failure behavior of thin-film sprayed materials under simulated tunnel rockfall support conditions. Traditional testing methods are not applicable to flexible thin-film sprayed materials and lack sufficient monitoring accuracy to reflect actual working conditions.

Method used

A method and apparatus for evaluating the load-bearing capacity and failure behavior of thin-layer sprayed materials are designed. By simulating the actual scenario of rockfall in tunnel engineering, high-precision monitoring technology is used to capture the deformation of the sprayed layer, and failure behavior parameters are extracted quantitatively throughout the process. Tests are conducted in combination with different lithologies and sprayed layer thicknesses.

Benefits of technology

It enables accurate assessment of the load-bearing capacity of thin-film shotcrete materials, provides scientific data reference, offers scientific theoretical support for tunnel lining construction, and enhances the scientific application and safety of thin-film shotcrete support technology.

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Abstract

The present application belongs to the technical field of tunnel engineering supporting material testing, and specifically discloses a method and device for evaluating the bearing capacity and failure behavior of thin spray material to realize accurate evaluation by simulating the working condition of tunnel rockfall support. The method is to process the rock plate with falling rock blocks from the rock to be tested, spray the experimental body with thin spray material, place it reversely, remove the rock block support, and apply force to the spray layer until it fails, calculate the shear strength or tensile stress at the bonding point according to the failure form, and replace the rock and adjust the thickness of the spray layer to obtain multi-dimensional data. The device includes a support, a rock mass, a thin spray material spray layer, a loading and monitoring unit, and through the cooperation of each unit, the whole process of spray layer deformation is monitored. The present application simulates the real stress state of the thin spray supporting layer under rockfall, solves the problem that the existing evaluation method is disconnected with the actual working condition, and fills the gap in traditional testing, providing scientific data support for thin spray material engineering selection and spray layer thickness design.
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