CLay Model Preloading Consolidation Device

Application

Clay model pre-pressing and molding system, which simulates and accelerates the consolidation process of soft soil models.

Typical Significance

• In centrifuge experiments, the pre-compaction molding system for soft soil models is a core link in ensuring model reliability and experimental accuracy. Its core function is to solve the model forming problems caused by the low strength and high compressibility of soft soil through a standardized preparation process, and provide a uniform, controllable soft soil model that is close to actual working conditions for subsequent centrifugal simulation.

• Ensure the uniformity of model density and water content: The physical and mechanical properties of soft soil are extremely sensitive to density and water content, and even small differences may lead to deviations in experimental results.

• Simulate the natural initial stress state of soft soil: Natural soft soil has an initial stress field under the action of long-term self-weight or overlying load, and the pre-compaction molding system needs to reproduce this state.

• Reduce disturbances during model preparation: The structure of soft soil is fragile, and traditional manual molding (such as layered filling) is prone to cause particle disturbance and drastic changes in void ratio.

• Adapt to the mechanical environment under high-speed rotation of the centrifuge: When the centrifuge is running, the model will bear centrifugal force equivalent to tens to hundreds of times the gravitational acceleration (g value). The pre-compaction molding must ensure the stability of the model in this environment.

Technical Parameters

• Four-column structure, with a column diameter of 50mm. The base plate is equipped with a guide rail sliding table to facilitate pushing the centrifuge model box into the compression space;

• The number of driving actuators is not less than 1, and the rated output is not less than 100kN. The loading output end of the driving actuator system is equipped with a guiding device, which uses polymer bearings and 4 columns for guiding to reduce the uneven displacement of the loading plate during the process. During operation, the displacement difference between the two ends of the loading plate is <3mm (or perpendicularity accuracy: <1deg);

• The servo-controlled feedback force sensor is installed under the guide plate, so the friction generated by guiding will not affect the stress measurement and control;

• Loading method: high-precision servo motor drives the ball screw;

• Axial actuator stroke: 1.0 meter;

• Maximum consolidation stress: 600kPa;

• Minimum applied stress: 1~5kPa;

• Pressure plate area: minimum 0.4m*0.25m, maximum 0.6m*0.3m (can be adjusted according to the actual size of the vibration model box);

• Control mode: stress + displacement (auxiliary) control;

• Control accuracy: 0.2% F.S (<1.2kPa);

• 1 stress control point, not less than 4 collection points, and stress uniformity of 1% F.S;

• It can realize the program-controlled step-by-step loading function, with a maximum of 15 levels;

• It has the function of measuring stress and displacement, and real-time stress-displacement curve;

• The software can switch between Chinese and English;