Hydraulic consolidation apparatus and hydraulic consolidation method for geotechnical centrifugal model test

Abstract

The present invention relates to a hydraulic consolidation apparatus and a hydraulic consolidation method for a geotechnical centrifugal model test. The hydraulic consolidation apparatus comprises a consolidation container, a reaction frame, a pressure loading device and a test device, wherein the consolidation container is a centrifuge model box, the pressure loading device comprises a loading plate, a hydraulic cylinder, an oil inlet pipeline and an oil return pipeline, the oil inlet pipeline is provided with a diversion valve and a pressure stabilization control device, and the test device comprises a pressure sensor, a pore pressure sensor, a displacement sensor and a computer. With the hydraulic consolidation apparatus and the hydraulic consolidation method of the present invention, the consolidation load can be provided for the model foundation in the constant stress field, the designed consolidation load can be provided for the model foundation in the hypergravity field, the loading pressure is accurate and uniform, the automation degree is high, the advantages of safety, quietness and convenience are provided, and the pressure range can be adjusted according to the specific test requirements.

Description

technical field [0001] The invention relates to an auxiliary device for a geotechnical centrifugal model test, in particular to a hydraulic consolidation device and method for a geotechnical centrifugal model test. Background technique [0002] Consolidation refers to the process in which the foundation soil is under the action of load or other factors, the water in the soil pores is gradually discharged, the volume is compressed, the density is increased, and the external pressure is gradually borne by the soil particle skeleton until the soil deformation reaches stability. Conventional indoor consolidation tests can usually only take a small part of the soil to simulate the consolidation of the soil under the action of additional stress. However, the stress that causes the prototype foundation to consolidate or compress includes the self-weight stress of the soil in addition to the additional stress, while the indoor test ignores the self-weight stress of the soil. Theref...

AI Technical Summary

Problems solved by technology

Among the above three commonly used methods, the lever pressurization method has the disadvantages of occupying a large space, cannot be used in the supergravity field, and is prone to bias phenomenon when the ultra-soft cohesive soil foundation is initially loaded and consolidated, and the lever pressurization method needs Manual handling of counterweights provides consolidation pressure, which is not suitable for large-scale application; the method of consolidation with heavy materials such as lead sand can only exert consolidation pressure on the model soil during the operation of the centrifuge. The range of consolidation pressure that can be applied to the foundation soil under stress field conditions is limited; the stability of the gas pressure during the implementation of the air pressure loading consolidation method is an important factor affecting the accuracy of the test results

At the same time, the ballast method and the air pressure loading consolidation method do not have a guide device for force transmission, which cannot ensure that the applied pressure is uniform and vertically transmitted to the model, and there is a bias in the loading process that leads to uneven consolidation of the soil. question

Images