Pressure-loaded one-dimensional consolidation and permeability joint test device

Abstract

The invention provides a pressure-loaded one-dimensional consolidation and permeability joint test device, which comprises a main device and an auxiliary device. The main device includes a top cover,a base, a laterally confined sample ring body, a permeable stone, a pneumatic loading hole channel, and a loading piston. A high-pressure gas cylinder is used for injecting the air pressure, so that the piston moves down to compress the sample. A linear displacement sensor records vertical deformation of the sample until the deformation is stable. At the same time, a liquid pressure-volume controller injects liquid into the sample and records the injected volume, and records the mass of the effluent liquid, so that the liquid flow rate under the percolation gradient is obtained and a permeability coefficient is calculated. With pore pressure and humidity sensors, axial pore pressure and humidity distribution of the sample under the osmotic pressure effect is recorded. After the seepage flow, humidity and pore pressure become stable, a next-stage load is applied and the seepage test is carried out continuously. The operations are repeated to obtain sample deformation data under variousstages of loads, so that the consolidation coefficient of the sample is calculated; and the fluid-solid coupling characteristics of the soil sample are finally obtained.

Description

technical field [0001] The invention relates to the technical field of environmental geotechnical engineering, in particular to a pressure-loaded one-dimensional consolidation-permeability combined testing device. Background technique [0002] The accelerated development of urbanization in my country has brought large-scale infrastructure construction and urban geological problems, and the research on the coupling characteristics of rock and soil mechanics-seepage is an important basic work for urban planning, construction, operation and management. Key issues in the strategic deployment of new urbanization. The fluid-solid coupling characteristic of soil means that due to the unique loose porous structure of the soil, the excess static pore water pressure will first be generated under load, and then the pore water will flow out slowly, and the pore water pressure will decrease. At the same time, the effective stress in the soil increases gradually, and the volume gradually ...

AI Technical Summary

Problems solved by technology

Although the traditional high-pressure consolidation instrument and soil permeameter can be used to understand the consolidation characteristics and seepage characteristics of the soil, it cannot reflect the coupling characteristics between the two

At present, traditional geotechnical test instrument manufacturers, such as Nanjing Soil Instrument Factory and Shangyu Survey Geotechnical Instrument Factory, do not have relevant equipment suitable for teaching and scientific research of fluid-solid coupling characteristics of soil

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