Contact surface great deformation shearing seepage flow test device and use method thereof

Abstract

The invention provides a contact surface great deformation shearing seepage flow test device and a use method thereof. The device comprises a normal loading unit, a normal pressure sensor, a horizontal loading unit, a tension sensor, a horizontal displacement meter, a shearing seepage coupling test box, a sealing unit, a seepage water pressure unit, a data collector and a control unit, wherein thehorizontal loading unit is connected with the bottom of the shearing seepage coupling test box and is arranged in a direction parallel to the contact surface shearing direction; the seepage water pressure unit comprises a seepage water flow water inlet passage, a seepage water flow water inlet, a seepage water flow water outlet passage, a seepage water flow water outlet and a pair of seepage water pressure and volume controllers in sequential communication; and the seepage water flow water inlet passage and the seepage water flow water outlet passage are arranged in a direction vertical to the contact surface shearing direction. The contact surface great deformation shearing seepage flow test device has the advantages that a shearing path and a seepage flow path are clear; and the contactsurface seepage characteristic test realizing the orthogonality of the shearing direction and the seepage flow direction can be realized, and the condition that the practical shearing deformation isvertical to the seepage flow process can be really simulated.

Description

technical field [0001] The invention belongs to the technical field of contact surface mechanics and permeability in geotechnical engineering, and in particular relates to a contact surface large deformation shear seepage test device and a use method. Background technique [0002] Clay has the advantages of good anti-seepage ability, strong ability to adapt and resist uneven deformation, and is widely used as the anti-seepage material for the core wall of high earth-rock dams. It plays an important role in the construction of high earth-rock dams with a level of two to three hundred meters in western my country. . Because the physical and mechanical properties of the core wall clay are very different from those of the upstream and downstream dam shells and bank slope bedrock, they are prone to large shear deformation under the action of self-weight stress and water load. These contact parts also have shear deformation and Seepage, and the direction of shear deformation is cl...

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Problems solved by technology

[0003] Most of the existing soil-structure contact surface test devices can only measure the mechanical properties of the contact surface, and seldom consider the seepage erosion effect, and have the following defects: 1) The patent "a method for measuring the seepage erosion of the soil and structure contact surface "Test device for characteristics" (CN101561378), invented an improved triaxial instrument to measure the seepage characteristics of the contact surface, the disadvantage is that the shear direction of the test is parallel to the seepage direction, and it cannot be studied that the shear direction is perpendicular to the seepage direction , and because the contact panel is supported by springs, the maximum shear dislocation deformation that can be produced is limited; 2) The patent "A Large Deformation Shear Seepage Test Device for Contact Surface and Its Application Method" (CN106932284 A) is a reference to the aforementioned patent An improvement has been made to achieve large shear deformation by freezing water. However, since the sample is square, the stress state of the soil sample is inconsistent when subjected to confining pressure, and stress concentration is prone to occur at the edges and corners, and the test shear The direction is still parallel to the seepage direction, and it cannot be applied to the case where the shear direction of the soil-structure interface is perpendicular to the seepage direction.

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