Strain type double-faced drainage squeezing instrument for pore water of ground

Abstract

The invention provides a strain type double-faced drainage squeezing instrument for pore water of the ground. The strain type double-faced drainage squeezing instrument at least comprises a filter pressing device, a water sample collecting device and an axial pressurizing device driven by a machine. The filter pressing device comprises a hollow column for containing a soil sample, a base, a pressing head, a sealing member, a filtering member and a pressure column. The water sample collecting device comprises a water guide pipe and a collecting bottle. The axial pressurizing device comprises a force measuring ring, an axial pressure support, a piston, an operation box, a motor and a speed changing box arranged between the motor and the operation box. The strain type double-faced drainage squeezing instrument is simple in operation, controls the ground to deform slowly to release water in a strain mode, does not damage the ground, and greatly shortens the test period simultaneously. The pore water is contained in the vacuum collecting bottle and is not influenced by air oxidation and evaporation, so that the research scope of the pore water is enlarged.

Description

technical field [0001] The invention relates to a squeezer, in particular to a strain-type double-sided drainage rock soil pore water squeezer, which is mainly used for testing the content and composition of pore water and belongs to the field of analytical chemistry. Background technique [0002] Pore ​​water is groundwater in the pores between loose sediment particles in rock and soil, and is widely distributed in strata in accumulation plains and intermountain basins. It is an important water supply source for industrial, agricultural and domestic water. The distribution, recharge, runoff and discharge of pore water are determined by the type of sediment, geological structure and landform. In sediments of different origins, there are different pore waters. Therefore, how to effectively extract and collect rock-soil pore water is an important factor to promote the development of aquitard hydrogeology. Squeezing is a widely used ex-situ pore water extraction method. Tra...

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Problems solved by technology

Traditional mechanical presses such as oil pressure, air pressure, and gravity pressure are all pressure-controlled. Due to the difference in rock and soil characteristics, it is difficult to grasp the critical pressure value of water and mud. The soil is easily crushed and the test period is long.

At the same time, because the pore water sample collection devices are exposed to the atmosphere, the pore water is easily oxidized and evaporated, which makes the chemical composition of the pore water deviate from the true value.

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