A flexible wall penetration device for measuring the permeability coefficient of frozen soil and its application method

Abstract

The invention relates to the field of flexible wall permeameters, and relates to a flexible wall permeation device for measuring the permeability coefficient of frozen soil and a use method thereof. Including the flexible wall permeation device, this part is placed in the temperature-controllable thermostatic chamber, the pressure control panel is on the right side, this part is used to provide medium pressure, and the lower part is the cold bath device, this part is used for liquid cooling. The flexible wall osmosis device mainly consists of three parts. The middle part is a pressure chamber, which is injected with refrigerant to provide confining pressure. On both sides of the pressure chamber are osmosis devices that provide upper and lower back pressure. The left side is the lower back pressure device. The internal liquid is made of rubber. Separated by the membrane, the upper part of the rubber membrane is for providing osmotic pressure liquid, the lower part of the rubber membrane is for permeating liquid, the right side is the upper back pressure device, the internal liquid is separated by the rubber membrane, the upper part of the rubber membrane is for permeating liquid, and the lower part of the rubber membrane is for providing osmotic pressure liquid. The confining pressure liquid and the penetrating liquid are respectively equipped with temperature probes, which are connected to the programmed temperature setting window on the temperature-controllable constant chamber. The above-mentioned device can realize the measurement of frozen soil permeability coefficient under different confining pressures, different osmotic pressures and different temperatures.

Description

technical field [0001] The invention relates to the field of flexible wall permeameters, and relates to a flexible wall permeation device for measuring the permeability coefficient of frozen soil and a use method thereof. Background technique [0002] Frozen soil refers to various rocks and soils with a temperature at or below 0°C and containing ice. It is mainly divided into three categories: short-term frozen soil, seasonal frozen soil and permafrost. In engineering construction in cold regions, soil frost heaving and thawing settlement caused by water migration are the main causes of permafrost diseases. When studying frozen soil engineering problems, it is necessary to accurately measure the permeability coefficient of frozen soil under different temperature conditions. It is the premise of theoretical research on frost heave simulation of soil engineering and groundwater recharge process. [0003] Conventional permeameters include rigid wall permeameters and flexible...

AI Technical Summary

Problems solved by technology

However, for frozen soil, the ice-water phase transition leads to blockage of the soil pores, so it is unrealistic to still use water as the seepage fluid, and the unfrozen water content of the soil is different under different temperature conditions, and the soil permeability coefficient is also different. will vary

If you continue to use the conventional flexible wall permeameter, it will not be able to meet the determination of the permeability coefficient of frozen soil under different temperature conditions.

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