A method and system for evaluating the stability of an inter-hole rock pillar based on in-situ acoustic testing

By combining in-situ acoustic testing and borehole displacement method, the strength and stress state of rock pillars in tunnels can be accurately assessed, solving the problem of low assessment accuracy in existing technologies and improving the accuracy and safety of rock pillar stability assessment.

CN122306952APending Publication Date: 2026-06-30POWERCHINA HUADONG ENG CORP LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
POWERCHINA HUADONG ENG CORP LTD
Filing Date
2026-05-08
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing technologies for assessing the stability of rock pillars in tunnels have low accuracy and large assessment biases, failing to accurately account for the influence of construction and support factors, leading to safety hazards.

Method used

The method based on in-situ acoustic testing is adopted. By measuring the average longitudinal wave velocity of the undamaged rock mass inside the rock column, the geological strength index of the rock mass is calculated. The rock column strength is reduced and corrected by combining the support force and the width-to-height ratio of the rock column. The average stress of the rock column is measured by combining the borehole displacement method, the safety factor of the rock column is calculated, and the stability of the rock column is evaluated.

Benefits of technology

This improves the accuracy of rock column strength parameter evaluation and the adaptability of rock column safety factor calculation, reduces calculation errors of traditional methods, and ensures the standardization and practicality of rock column design.

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Abstract

This invention discloses a method and system for assessing the stability of inter-tunnel rock columns based on in-situ acoustic wave testing. The method includes the following steps: determining the average longitudinal wave velocity of undamaged rock within the target rock column based on acoustic wave test data; calculating the rock mass geological strength index based on the obtained average longitudinal wave velocity of the undamaged rock mass; calculating the support force of the sidewalls of the target rock column; calculating the compressive strength of the rock mass based on the obtained rock mass geological strength index and support force; obtaining the rock column strength by reducing and correcting the rock column's width-to-height ratio and rock hardness based on the obtained rock mass compressive strength; measuring the average stress of the target rock column using the borehole displacement method; and calculating the rock column safety factor and assessing the stability of the target rock column based on the obtained rock column strength and average stress, thus obtaining the stability result. This invention, based on in-situ acoustic wave and borehole testing, accurately calculates the rock column strength and stress, improving the accuracy and applicability of the safety factor and better aligning with engineering practice.
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