Saturation device for piezocone penetration field probe and filter ring thereof

Abstract

The invention discloses a novel saturation device for a piezocone penetration probe measurement system and a filter ring thereof. The device mainly comprises a probe (1), a hole pressure filter ring (9), a sealed container (3) and a vacuum pump (7); an aperture is opened in the middle of the upper part of the sealed container (3); a taper angle root at the lower part of the probe (1) is provided with the hole pressure filter ring (9); the bottom half of the probe (1) penetrates into the sealed container (3) through the aperture; an O-shaped seal ring (4) is embedded between the probe (1) and the aperture; the upper part of the sealed container (3) is provided with a clamp (2); glycerin (8) is injected in the sealed container (3); the sealed container (3) is connected with the vacuum pump (7) by an air duct (5); and the upper part of the vacuum pump (7) is provided with an exhaust valve (6). By using the saturation device, the saturation device has the characteristics of facility, labor conservation, high efficiency and the like and provides a powerful saturation tool for the in-situ pore water pressure static cone penetration test experiment.

Description

technical field [0001] The invention relates to a new device used in a pore pressure static penetration probe measurement system and filter ring saturation, belonging to the technical field of geotechnical engineering investigation. Background technique [0002] As the most important in-situ testing technology, static penetration testing (CPT) has the advantages of fast and convenient, no sampling, large amount of collected data, little interference and low cost. It is especially suitable for linear distribution such as highways and railways. Large-scale projects with a wide range. Static CPT technology refers to using a pressure device to press a penetrating rod with a probe into the test soil layer, and through the measurement system to test the cone tip resistance and side wall friction resistance of the soil, some basic physical properties of the soil can be determined. Mechanical properties, such as the deformation modulus of the soil, the allowable bearing capacity of...

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Problems solved by technology

This will cause the test value of the pore pressure to be lower than the real value and the hysteresis effect of peak elimination

Due to the large difference between the excess pore water pressure value and its dissipation curve measured by the unsaturated probe and the actual situation, it cannot be applied in engineering investigation, resulting in the failure of the test

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