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

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...

AI Technical Summary

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 consider the constraint conditions of constant stress and constant volume, but cannot realize the control condition of constant stiffness, and the condition of constant stiffness is more complicated to realize, so a design that can simulate three control conditions at the same time The experimental device of interface shear behavior will be a great technological innovation and improvement

Images