Testing device for observing deformation of three-dimensional space in transparent soil model and application method thereof

Abstract

The invention belongs to the technical field of model tests of geotechnical engineering and in particular relates to a testing device for observing deformation of three-dimensional space in a transparent soil model and an application method thereof. The device is mainly prepared from a loading system, a shoe model, a model casing, a lifting visual testing platform, a CCD industrial camera, a transmission system a, a transmission system b, a transmission system c, a laser and a computer. The operating height is adjusted by means of the lifting visual testing platform and the three transmissionsystems control the CCD industrial camera and the laser to move synchronously. The device provided by the invention is simple in structure, clear in principle, easy to operate and relatively low in cost; the transparent soil model are sliced and photographed from two directions, separately, to acquire displacement components of each node in the three-dimensional space in three directions conveniently; the change process of the deformation of the three-dimensional space of a soil mass can be monitored continuously in a non-invasive mode, so that the deformation of the three-dimensional space ofthe soil mass is measured truly.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering model tests, and in particular relates to a test device and a use method for observing three-dimensional space changes inside a transparent soil model. Background technique [0002] The measurement of soil deformation is one of the important foundations of soil mechanics and geotechnical engineering research. Traditional indoor model tests and field tests can only observe the macroscopic deformation of the soil and surface deformation, but cannot observe the three-dimensional space deformation inside the soil. In order to realize the visualization of the internal deformation of the soil, the researchers invented a new indoor model test method - transparent soil test technology. Utilizing the unique "transparency" characteristics of transparent soil and combining image observation technology to realize the non-invasive soil internal visualization research, it is of great significa...

AI Technical Summary

Problems solved by technology

Although this technology can realize the measurement of the three-dimensional displacement field inside the transparent soil, it will disturb the sample by moving the model box, and at the same time drive the loading system to cause the complexity of the test operation, and problems such as changing the distance between the camera and the laser fan will cause serious problems. The clarity of the pictures taken by the test is affected

The Chinese invention patent "Visual test device and method of failure form of heterogeneous pile-soil contact surface" (application number CN105716970A) discloses a visual test device for failure form of special-shaped pile-soil contact surface, through two cameras and four Two lasers are used to visually observe the movement of the soil on the pile-soil contact surface, but this method uses the control of the upper camera in the horizontal direction to not move, and the two lasers are irradiated to form slices for shooting, and only two images in the horizontal direction can be taken. Slicing; two lasers are also irradiated in the vertical direction, and the camera is moved along the circular track to take pictures

This method will affect the shooting effect of the camera due to the simultaneous irradiation of two laser sources. At the same time, the three displacement components on the same coordinate point cannot be obtained by taking pictures along the circular track, so what is observed is not the real three-dimensional space deformation of the soil.

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