Soft soil microstructure sample preparation device

Abstract

The invention discloses a soft soil microstructure sample preparation device which comprises a sampling device, a liquid nitrogen heat insulation tank and a peristaltic pump, wherein the sampling device and the peristaltic pump are respectively communicated with the liquid nitrogen heat insulation tank through hoses. When in operation, the sampling device is inserted into soil by closing and opening a locking mechanism, a microstructure sampling bin device reaches a designated position, a valve of the peristaltic pump is opened, liquid nitrogen in the liquid nitrogen heat insulation tank is pressed into a liquid nitrogen cavity by pressure, thermo sensitive color-changing volatile liquid in a closed temperature sensing cavity changes along with soil temperature, color change of the outer wall of the cavity is displayed by observing outer wall temperature sensing materials of an upper cavity, a soil sample is taken out by the microstructure sampling bin device, and sampling is finished. Operation of manual sample cutting is avoided, sampling efficiency and accuracy are improved, cost is effectively saved, experimental efficiency is improved, the soil sample is not destroyed, and microstructures of different positions of the soil are observed by determining the position of the cut soil sample.

Description

Technical field [0001] The invention relates to the technical field of soil microstructure research, in particular to a soft soil microstructure sample preparation device. Background technique [0002] Soil is a structural body. The microstructure of the soil is closely related to its strength and other macro-mechanical properties. At the same time, the microstructure has a direct relationship with the engineering characteristics of the soil, which can be determined by the law of soil structure change. Understand the engineering properties of soil and analyze the macroscopic engineering problems from the perspective of microscopic study of soil deformation. The microstructure of soil is very complicated. Among the large amount of information data obtained, the directional information of soil microstructure is also very important. The various properties of soil fabric directly lead to the anisotropy of soil permeability. Therefore, How to ensure the reduction of the disturbance t...

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Problems solved by technology

However, in the microstructure sampling process of the prior art sample preparation device, there is a large error between the soft soil sample preparation and the actual sample cutting. Some soft soil has more fine particles and higher water content, and the samples are artificially broken apart. Or it is not easy to cut the sample to make the undisturbed soil microstructure sample with a specified size and good orientation

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