Dynamic pore-pressure static sounding probe for detecting sludge

Abstract

The invention discloses a dynamic pore-pressure static sounding probe for detecting sludge. A coaxial cable (1) is used for transferring a signal and data; an analogue-digital converter (2), an acceleration transducer (3) and a gradiograph (4) are arranged on an upper half section of the probe; a side-wall friction cylinder (5) is arranged on a lower half section of the probe; a side wall frictional resistance sensor (6), a pore water pressure sensor (7), a disc resistance sensor (8) and a temperature sensor (9) are arranged in the side-wall friction cylinder (5); a disc (10) is connected under the side-wall friction cylinder (5); a filtering net (11) is arranged at the center of the disc (10); the filtering net (11) is also located at the center of the side-wall friction cylinder (5); and a water inlet channel is formed between the filtering net (11) and the pore water pressure sensor (7). The application of the probe has the characteristics of in-situ, directness, quickness, accuracy, economical property, and the like, and a powerful testing tool is supplied to geotechnical engineering practice.

Description

technical field [0001] The invention relates to a dynamic pore pressure static sounding probe which can be used for detecting mud, and belongs to a static sounding device capable of directly and continuously analyzing and testing river bottom or sea bottom mud in the field of geotechnical engineering. Background technique [0002] 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 the soil, etc. The static penetration technology has a history of more than 80 years. Static CPT is widely used in the world, partially or completely replacing drilling and sampling in engineering investigation. In 1965, our country first successfully de...

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Problems solved by technology

These sludges are usually buried under deep water and are very viscous and thixotropic, with low strength and high sensitivity

Existing sampling techniques cannot obtain undisturbed samples, and moisture loss will also occur during transportation, which makes the laboratory test results seriously deviate from its true value

Although the existing static penetration testing technology can be used to evaluate the in-situ characteristics of the silt, the penetration resistance produced by the existing static penetration testing equipment is low because the strength of the silt is too low and some of them are in the state of suspended solids. Due to its own resolution, the measurement accuracy is difficult to meet the requirements of high-quality data

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