Dual-compression soil sample preparation device and sample preparation method

Abstract

The invention discloses a dual-compression soil sample preparation device, which comprises a dual-compression mechanism and a sample preparation barrel, wherein the sample preparation barrel is vertically arranged and cuts through from top to bottom; the dual-compression mechanism comprises an upper compression device and a lower compression device; the upper compression device comprises an upperadjusting rod arranged at the upper end of the sample preparation barrel, an upper limiting part and an upper compression part, the upper compression part is movably arranged in the sample preparationbarrel in a sleeved mode, the upper limiting part is arranged above the upper compression part, and the upper limiting part and the upper compression part are arranged on the upper adjusting rod in amode that the distance between the upper limiting part and the upper compression part can be adjusted; the lower compression device comprises a lower adjusting rod, a lower limiting part and a lowercompression part, the lower compression part is tightly arranged in the sample preparation barrel in a sleeved mode, the lower limiting part is arranged under the lower compression part, the lower limiting part and the lower compression part are arranged on the lower adjusting rod in a mode that the distance between the lower limiting part and the lower compression part can be adjusted, and the lower adjusting rod is fixedly connected with a piston rod of a hydraulic device in the axial direction. By means of the structure, soil sample evenness can be improved. The invention further provides asample preparation method of the dual-compression soil sample preparation device.

Description

technical field [0001] The invention relates to the field of earthworks, in particular to a double-compressed soil sample preparation device and a sample preparation method. Background technique [0002] In the construction of earthworks, the soil needs to be compacted to achieve the design compaction. The shear strength of the compacted soil is an important factor affecting the stability of the project. The indoor test is used to determine the reshaped soil. Strength is an indispensable and important link. Moreover, according to the National Geotechnical Test Regulations, the density of remolded soil samples needs to be strictly controlled to ensure the uniformity of parallel samples, the comparability and validity of experimental data. [0003] The traditional preparation method of remolded soil samples adopts the layered compaction method. Because of the uncertainty of the relationship between the compaction number and the density of each layer of soil in this method, it...

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Problems solved by technology

[0004] However, the above-mentioned devices all compress the soil sample from top to bottom, and mainly ensure the uniformity of the soil sample by controlling the compaction height of each layer of soil, although this method can improve the soil sample to a certain extent. However, due to the influence of friction between the soil sample and the mold, this method of single-weight compression of the soil sample cannot effectively solve the problem of uniformity of the soil sample

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