Self-triggered reinforcing structure and method for coral sand foundation under earthquake action

By using a shell, core, and induction excitation system in a coral sand foundation, the seismic load characteristics are monitored and self-triggered reinforcement grout is applied to form a vertical reinforcement, which solves the problems of targeted and stable reinforcement of coral sand foundations and improves the bearing capacity under seismic loads.

CN122169484APending Publication Date: 2026-06-09NANJING TECH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING TECH UNIV
Filing Date
2026-02-03
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing technologies cannot address the dynamic load type in coral sand foundation reinforcement, which can easily lead to redundancy or under-reinforcement. Furthermore, the reinforcement effect is poor in high-salt and high-humidity environments, resulting in poor long-term stability.

Method used

The system employs a shell, core, and induction excitation system. It monitors seismic load characteristics through MEMS accelerometer chips and Hall effect chips, controls coils to drive the core to insert into the soil, and achieves self-triggering of the reinforcing grout through an oil-secreting module and a pressure spraying system to form a vertical reinforcement structure.

Benefits of technology

It enables accurate identification and reinforcement of seismic loads, avoids ineffective reinforcement under non-seismic loads, improves the bearing capacity and stability of coral sand foundations, and reduces the risk of sand liquefaction caused by earthquakes.

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Abstract

This invention provides a self-triggered reinforcement structure and method for coral sand foundations under seismic loading. The structure includes a shell, a core, an induction excitation system, an oil-secreting module, and a pressure spraying system. The core is located inside the shell cavity and a weak magnet is fixed on it. The induction excitation system includes a MEMS accelerometer chip, a Hall effect chip, and an iron core. A coil is mounted on the iron core. The MEMS accelerometer chip and the Hall effect chip are used to monitor the seismic magnetic effect and acceleration variations. When the seismic magnetic effect occurs and the acceleration exceeds a threshold, the coil and the iron core become electromagnets with the same polarity as the weak magnet, and the core is inserted into the soil for reinforcement. The oil-secreting module is used to reduce the friction between the core and the shell, and the pressure spraying system is used to cause the reinforcement grout inside the shell to overflow for reinforcement. This invention can monitor the dynamic load state in real time. Through the self-triggered core structure in the pressure spraying system and induction excitation system, the surrounding soil of the reinforced structure is actively grouted and reinforced to form a vertical reinforcement structure.
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