Method for evaluating safety of early-age shotcrete of primary support under cyclic blast load

By establishing finite element and neural network models, and combining temperature gradient and mechanical characteristic parameters, the safety of shotcrete under cyclic blasting loads is evaluated, solving the problem of difficulty in evaluating the safety of shotcrete in existing technologies, and realizing a more scientific and reliable safety assessment of tunnel construction.

CN121257141BActive Publication Date: 2026-06-26CHINA RAILWAY FIRST GROUP CO LTD +2
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA RAILWAY FIRST GROUP CO LTD
Filing Date
2025-08-13
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing technologies make it difficult to accurately assess the safety of shotcrete under cyclic blasting loads, especially in the early stages when its strength and durability are affected by both high temperature and dynamic loads. The lack of systematic analysis and evaluation methods leads to safety hazards in tunnel construction.

Method used

A finite element model was established, and the blasting load was determined by the detonation wave theory of condensed matter explosives. Combined with temperature gradient data and mechanical characteristic parameters, a neural network model was used to monitor changes in water content. The mapping relationship between the mechanical characteristic parameters of the support and the degree of hydration and water content was established. Safety difference standards were set to evaluate the damage and safety of shotcrete.

Benefits of technology

It enables accurate safety assessment of shotcrete under cyclic blasting loads, improves the scientific rigor and rationality of the assessment, provides data support for construction management and quality control, and reduces safety hazards.

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Abstract

The application discloses a kind of early support early age period shotcrete safety evaluation method under cyclic blast load, and the application relates to the field of concrete reliability analysis, comprising the following steps: determining the geometric parameters of the tunnel to be protected, and establishing a tunnel finite element model;Determine the blast load using the blast wave theory, and perform finite element analysis on the model by applying the load to obtain the residual deformation data of each extraction point;Determine the blast load influence range;Monitor the ambient temperature time series data of the evaluation sub-section, and characterize its hydration degree and water content;Establish the mapping relationship between the mechanical characteristic parameters and the hydration degree and water content, calculate the mechanical characteristic parameters of the concrete, and determine the safety of the shotcrete by comparing the damage and safety difference standards, improve the scientific nature of the safety evaluation of shotcrete.
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Citation Information

Patent Citations

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