Device and method for preparing true triaxial remolded sample by utilizing vacuum preloading

Abstract

The invention discloses a device and a method for preparing a true triaxial remolded sample by utilizing vacuum preloading. The device comprises a sealed top cover, a test sample preparation frame, a drainage base, a saturation device and other main components, as well as mating parts, such as a rubber mold, a rubber sealing washer, a preservative film and filter paper. The sealed top cover is made of a rectangular hollow flange plate; the test sample preparation frame consists of a flange plate and a rectangular frame, and the purposes of being easy to cut and settling and preserving a soil sample can be realized; the drainage base is made of a solid flange plate, and is provided with a rectangular groove, drainage holes distributed in a plum-blossom type are formed in the groove to realize two functions of drainage and reserve of a cutting layer, and a water collecting box is arranged on the other side of the base; the saturation device is arranged, so that the prepared soil sample can absorb water to be saturated. According to the device and method disclosed by the invention, the purposes of fast preparing a saturated test sample with slightly high moisture content can be realized, the density and moisture content of the prepared test sample are accurate and uniform, secondary cutting, disturbance and waste can be avoided, the production flow can be simplified, and the research efficiency of true triaxial testing can be effectively improved.

Description

technical field [0001] The invention relates to a sample preparation technology in the field of geotechnical engineering, in particular to a device and method for preparing a true triaxial remodeling sample by vacuum preloading. Background technique [0002] Conventional triaxial test is an important method to study soil properties, but it can only reflect the properties of soil under symmetric stress state, and cannot reflect the influence of medium principal stress. However, the soil is actually in a three-dimensional stress state with three different directions, and the conventional triaxial test cannot accurately reflect the true nature of the soil. There are more and more major projects such as high earth-rock dams and underground structures, and it is more and more necessary to consider the deformation and stability of the soil under the three-dimensional stress state, so it is necessary to conduct true triaxial test research on the soil. [0003] The samples used in ...

AI Technical Summary

Problems solved by technology

Layers are required in the preparation process. The height of each layer is usually judged by the naked eye based on experience, and the compaction work of each layer is different. In addition, there are structural planes between layers, and the height of residual soil is also a factor that is not easy to control. The above factors will lead to The water content and density of the sample are not uniform among layers, and the difference between different samples will be large

Especially for the preparation of samples with slightly higher moisture content, it is easy to form spring soil when impacted, and the above shortcomings will be more obvious

The operation process of this method is complicated, the water content and density of the prepared sample are not uniform, and it is difficult to prepare a sample with a slightly higher water content.

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