A Wireless Safety Monitoring and Early Warning Method for Foundation Pit Based on Vibration Feature Extraction from Strain Gauge Array

By using a wireless safety monitoring method based on strain gauge arrays, and utilizing dual-path signal conditioning and adaptive gain control, combined with kurtosis value and high-frequency energy ratio, early warning with high sensitivity, low power consumption and low false alarm rate for foundation pit support structures is achieved, solving the problems of insufficient monitoring sensitivity and high false alarm rate in existing technologies.

CN122223923BActive Publication Date: 2026-07-17SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Filing Date
2026-05-14
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing foundation pit monitoring technologies cannot achieve high sensitivity, low power consumption, low false alarm rate, and autonomous identification of earthquake source type, making it difficult to capture micro-fracture signals of support structures and provide early warnings.

Method used

A wireless safety monitoring method based on strain gauge arrays is adopted. By utilizing a wireless sensor network consisting of multiple wireless acquisition nodes and a LoRa gateway, and through dual-path signal conditioning and adaptive gain control, combined with the changes in kurtosis value and high-frequency energy ratio and orientation angle discrimination factor, a high-sensitivity detection of weak vibration signals and a reduced false alarm rate are achieved.

Benefits of technology

It achieves high-sensitivity detection of weak vibration signals at the submicro-strain level, significantly reduces power consumption of monitoring nodes, lowers the false alarm rate, and provides large-scale early warnings several hours in advance, adapting to the dynamic changes in noise during the foundation pit construction stage.

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Abstract

This invention discloses a wireless safety monitoring and early warning method for foundation pits based on vibration feature extraction from strain gauge arrays, belonging to the field of foundation pit engineering safety monitoring technology. The method includes: acquiring node vibration signals in parallel through dual channels; calculating the kurtosis value and high-frequency energy ratio in the node vibration signals; marking the difference between the real-time kurtosis value and high-frequency energy ratio reported by the gateway and the baseline value of the background model as a suspected structural rupture event; for suspected structural rupture events, acquiring the original vibration waveforms of the corresponding node and adjacent nodes; calculating the orientation angle discrimination factor and rupture impact index based on the original vibration waveforms of the corresponding node and adjacent array nodes to determine the hazard level; outputting corresponding level early warning information according to the determined hazard level, while dynamically adjusting the acquisition cycle, acquisition duration, and reporting strategy of the corresponding node. This invention can provide long-term reliable safety early warning for deep foundation pit engineering.
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