A micro-volume displacement type water level simulation device and method for a triaxial apparatus

By using a micro-volume displacement-type water level simulation device, combined with a stepper motor and PID algorithm, the control accuracy and stiffness problems of triaxial instruments in dynamic water level simulation were solved, realizing low-cost upgrade of old equipment and high-precision water level simulation.

CN122448641APending Publication Date: 2026-07-24NANJING HYDRAULIC RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING HYDRAULIC RES INST
Filing Date
2026-04-09
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing triaxial apparatuses suffer from low control accuracy, poor system rigidity, high equipment cost, and difficulty in modification when simulating dynamic water levels, failing to meet the low-cost upgrade needs of universities and research institutes.

Method used

A micro-volume displacement-type water level simulation device is adopted, which uses a stepper motor to drive the push rod assembly and the micro cylinder, and combines a PID algorithm to achieve high-precision water level control. It simulates pore water pressure changes through micro-volume changes. The device is independent of the triaxial instrument main unit and supports the upgrade of old equipment.

Benefits of technology

It achieves high-precision and fast-response water level simulation, reduces retrofit costs, is suitable for upgrading old triaxial instruments, can accurately reproduce complex water level processes, and improves system rigidity and automation.

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Abstract

The present application belongs to the technical field of geotechnical engineering, and in particular to a micro-volume displacement type water level simulation device and method for a triaxial apparatus, which comprises a controller, a driving step motor, a push rod assembly, a micro cylinder, a triaxial apparatus, and a computer. The push rod assembly is driven by the step motor to extend and retract. One end of the micro cylinder is a piston connected to the push rod assembly, and the other end is a water outlet pipeline. The triaxial apparatus is connected to the water outlet pipeline and contains a sample. The computer is used to input a predetermined water level change curve, which is converted into a target pressure signal and sent to the controller. The computer sets a target water level curve, and the controller drives the step motor to generate a micron-level displacement according to the difference feedback by the pressure sensor. The incompressibility of water is utilized to achieve precise control of pore water pressure through micro-volume changes, reducing mechanical wear and allowing the system to complete pressure response in a very short time, achieving non-lagging tracking of transient water level, and improving the control accuracy and mechanical life of the system.
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