Physical and mechanical parameter measuring device for unsaturated expansive soil

Abstract

The invention discloses a physical and mechanical parameter measuring device for unsaturated expansive soil. The physical and mechanical parameter measuring device comprises a device frame body, an expansive soil measuring position, a conductivity measuring structure and an expansion deformation measuring structure, the expansive soil measuring position comprises a rigid water permeable plate, anupper water permeable plate and a lower water permeable plate, a soil sample storage space is formed between the upper water permeable plate and the lower water permeable plate, and a plurality of stand columns with stress sensors are arranged between the rigid water permeable plate and the upper water permeable plate; the conductivity measuring structure adopts a parallel circuit form, and the conductivity of the expansive soil samples with different measurement positions and different water contents is calculated according to the difference of the conductivity of the expansive soil after electrification; and the expansion deformation measuring structure measures lateral deformation of the expansive soil under the condition of lateral confinement. The measuring device provided by the invention is relatively simple to operate, can quickly and effectively measure the key physical and mechanical parameters of the expansive soil body, can further analyze the correlation function relationship of each parameter under the condition of the same water content, and is beneficial to comprehensively defining the physical and mechanical properties of the expansive soil.

Description

technical field [0001] The invention relates to the technical field of measuring equipment for civil engineering and geotechnical engineering, in particular to a device for measuring physical and mechanical parameters of unsaturated expansive soil. Background technique [0002] Expansive soil is a special clay containing more strongly hydrophilic minerals. Due to the existence of these strongly hydrophilic mineral components, expansive soil shows special engineering properties. During the dry-wet cycle, the presence of strongly hydrophilic minerals leads to the strong water absorption of expansive soil. Due to a large amount of water absorbed, the volume expands, and a large amount of water is lost, the volume shrinks, and the expansive soil shows expansion and contraction. The physical and mechanical properties of expansive soil are the basis for engineering use of expansive soil, such as expansive force, expansion deformation, electrical conductivity, water content, free ...

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Problems solved by technology

[0004] Combining the existing measurement devices, there are corresponding measurement methods for each physical parameter, but the existing measurement methods have low efficiency, high cost, and it is difficult to analyze the functional correspondence between various correlation coefficients. Therefore, it is necessary to design a non- Measuring device for physical and mechanical parameters of saturated expansive soil, reducing measurement cost and improving measurement efficiency

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