Test device and test method for simulating contact surface seepage coupling characteristics

Abstract

The invention provides a test device and test method for simulating contact surface seepage coupling characteristics, and belongs to the technical field of earth and rockfill dam construction.The testdevice comprises a test cavity defined by a cylinder body, a top cover and a bottom plate, and the test cavity comprises an original graded soil sample cavity and a pressure cavity formed in the periphery of the original graded soil sample cavity in a sealed mode; the original graded soil sample cavity and the pressure cavity are separated through an elastic sealing layer, a rotating concrete shaft is arranged in the middle of the original graded soil sample cavity, and the concrete shaft is connected to a secondary speed reducer through a horizontal belt transmission device and then connected to a motor with the adjustable rotating speed. An upper permeable plate and a lower permeable plate for accurately simulating seepage characteristics are respectively arranged at the upper end and the lower end of the original graded soil sample cavity. The problems of high loading torque, difficult coupling loading, difficult water stopping and the like faced by the test device for simulating the stress deformation seepage coupling characteristic between the original graded gravel soil core wall material of the earth and rockfill dam and the bank slope contact surface are solved, and the problems of small geometric dimension of existing equipment and poor accuracy of obtained test data are avoided.

Description

technical field [0001] The invention relates to the technical field of testing mechanical properties of earth-rock dam materials, in particular to a deformation-seepage coupling characteristic test device and a test method for simulating the contact surface of an earth-rock dam core wall and a bank slope. Background technique [0002] One of the main causes of core earth-rockfill dam accidents is the seepage damage of the core wall anti-seepage body. There is a strong interaction between the anti-seepage body of the core wall and the bank slope. In the existing cases of sudden leakage or dam failure of earth-rock dams, seepage damage basically occurs at the contact surface between the anti-seepage body of the core wall and the bank slope. The contact surface between the anti-seepage body of the core wall and the bank slope has a combination of orthogonal high seepage pressure-large deformation-certain normal stress. Whether this effect will produce a weak surface due to seep...

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Problems solved by technology

[0004] Aiming at the above-mentioned problems in the prior art, the present invention provides a test device and test method for simulating the seepage coupling characteristics of the contact surface, which solves the problem of simulating the contact surface between the original graded gravel soil core wall material and the bank slope in the prior art. The problem of poor accuracy of the test data obtained by the stress-deformation-seepage coupling characteristic test device

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