Scale model testing device capable of simulating prototype pile foundation stress state

Abstract

The invention discloses a scale model testing device capable of simulating the prototype pile foundation stress state. The scale model testing device comprises a cylindrical outer box and inner box; asoil sample is placed in the inner box, and a pile foundation is buried in the soil sample; the inner box is defined by four or more identical circular-arc-shaped abrasive tools, and four radial baserails are arranged at the bottom of the outer box; a clamping groove of each abrasive tool is clamped in the corresponding base rail, and each abrasive tool and the two corresponding adjacent abrasive tools are connected in an end-to-end lapped mode; and a device applying the pressure to the side wall of the inner box is arranged between the outer box and the inner box, and thus the radial dimension of the inner box is decreased. By arranging the outer box and the retractable rigid inner box, the working property of a pile-soil system under the actual stress state is simulated in a segmentedmode, a vertical pressure gauge or an airbag is arranged in pile periphery soil to calibrate and real-timely monitor the pressure change of the pile-soil system, and thus the scale model testing device capable of being reutilized and simulating the stress state of the prototype pile-soil system is obtained.

Description

technical field [0001] The invention relates to a reduced-scale model test device capable of simulating the stress state of a prototype pile foundation, belonging to the field of indoor tests of geotechnical engineering. Background technique [0002] Soil is a smart material with "memory", and its mechanical properties are affected by the stress history. The same is true for the pile-soil interaction. Under the low stress state, the soil around the pile produces shear expansion, but under the high stress state, the soil around the pile produces shear shrinkage. [0003] The field test can restore the actual stress state of the pile-soil system, but the field soil layer is complex and changeable, not representative, and more importantly, the field test is very expensive and can only be used as a verification for other studies. Therefore, the experimental research on the mechanism of pile-soil interaction mainly relies on scaled-down model tests under constant stress. Howeve...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the traditional scale model test cannot simulate the stress state of the soil around the pile, and provide a scaled model test device that can simulate the stress state of the prototype pile foundation and can be reused

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