Ring shear apparatus considering constant stiffness, constant volume and constant stress,

A constant stiffness and stress technique, which is used in the field of experimental devices for measuring the shear characteristics of different soils and interfaces under different contact conditions, can solve the problems that the interface boundary effect has a large influence, is complicated, and cannot achieve the control conditions of constant stiffness.

Inactive Publication Date: 2018-10-02
ZHEJIANG UNIV
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Problems solved by technology

The direct shear instrument and the simple shear instrument can only apply limited shear displacement, and the influence of the boundary effect of the interface is relatively large, so the scope of use is limited; while the ring shear instrument can achieve infinite displacement shear and the boundary influence is small. favored
However, the current ring shear instrument can only cons

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  • Ring shear apparatus considering constant stiffness, constant volume and constant stress,
  • Ring shear apparatus considering constant stiffness, constant volume and constant stress,
  • Ring shear apparatus considering constant stiffness, constant volume and constant stress,

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Embodiment Construction

[0022] refer to Figure 1-4 , the ring shear instrument of the present invention that can consider constant stiffness, constant volume and constant stress includes a frame, a shearing system, a torsion device, a hydraulic loading system, and a sensor detection system;

[0023] Frame comprises upper crossbeam 1, lower crossbeam 15, pedestal desktop 16, column 21, horizontal support 10, vertical support 11, displacement meter horizontal support 20 etc., each part is welded as a whole.

[0024] The shearing system includes an upper shearing box 24 and a lower shearing box 25, both of which are ring-shaped, respectively containing the soil body and the structure interface to simulate the shearing behavior of the interface. The steel sheet is used to fix the soil body and the pile body, and the upper shear box 24 is made of plexiglass, which is convenient to utilize the CCD camera to directly observe the change situation of soil particles and structure in the shearing process, and ...

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Abstract

The invention discloses a ring shear apparatus considering constant stiffness, constant volume and constant stress, wherein the ring shear apparatus includes a rack, a shearing system, a torsion device, a hydraulic loading system and the like. The shearing system comprises an upper shearing box, a lower shearing box and a stiffness adjusting device. The stiffness adjusting device is arranged abovethe upper shearing box, and the hydraulic loading system and the torsion device are respectively arranged above and below the shearing system; the hydraulic loading system is connected with the stiffness adjusting device to apply the stress to the shearing system; the torsion device is used for providing torque to the lower shearing box. Compared with a conventional ring shearing apparatus, the ring shear apparatus can adjusting the stiffness state of the device by adjusting and controlling the stiffness, and can realize shearing states of three different constraint conditions of constant stiffness, constant volume and constant stress by combining the loading condition of the hydraulic loading system. Shear test detection of different contact types between soil and interfaces can be achieved by an experimental device; a number of mechanical parameter indexes can be obtained, parameters can be provided for engineering design and installation, and engineering practice is guided.

Description

technical field [0001] The invention relates to a ring shear instrument, in particular to a ring shear instrument which can consider constant stiffness, constant volume and constant stress, which can be used to measure different soils (sandy soil, clay, silt, etc.) and interfaces (steel interface, concrete interface) etc.) The experimental device for shear characteristics under different contact conditions, that is, the interface shear behavior under various constraints such as constant stiffness, constant volume and constant stress can be considered. Background technique [0002] The interaction between the soil and the structure interface plays an important role in the installation and service of the structure. For example, when the gravity foundation is subjected to horizontal force, the shear behavior of the soil and the interface directly determines the stability of the foundation; The interface shear of the pile directly affects the penetration resistance and driving d...

Claims

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Application Information

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IPC IPC(8): G01N3/22
CPCG01N3/22G01N2203/0021G01N2203/0048
Inventor 芮圣洁赵爽国振周文杰王立忠
Owner ZHEJIANG UNIV
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