Spherical hole-pressure static cone penetration probe for detecting sludge

Abstract

The invention declares a spherical hole-pressure static cone penetration probe for detecting sludge. The probe comprises a coaxial cable (1) used for signal and data transmission, a probe rod (2) and a waterproof ring (3) at the upper part, and an analog-digital converter (4) in the middle, wherein a seal ring (5) and a side wall friction tube (6) are arranged at the lower part of the probe rod (2); an inclinometer (7), a side wall friction resistance sensor (8) , a temperature sensor (9), three pore water pressure sensors (10.1, 10.2 and 10.3) and a round sphere-shaped resisting force sensor (11) are arranged in the side wall friction tube (6); the spherical probe (12) is connected with the lower part of the side wall friction tube (6); three hole-pressure filtering rings (13.1, 13.2 and 13.3) are arranged on the spherical probe (12) and are respectively connected with the three pore water pressure sensors (10.1, 10.2 and 10.3). The probe provided by the invention has the characteristics of being in-situ, direct, quick, accurate and economical, and provides a powerful detect tool for geotechnical engineering practice.

Description

technical field [0001] The invention relates to a spherical 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 ...

AI Technical Summary

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 static penetration testing equipment is lower than its own because the strength of the silt is too low and part of it is in the state of suspended solids. resolution, so the measurement accuracy is difficult to meet the requirements of high-quality data

Although the T-shaped penetrator and the disc-powered CPTU probe increase the area in contact with the silt and improve the resolution, the former is prone to unbalanced force during the penetration process, and the probe and other components are easily damaged; the latter is more suitable for suspension In the detection of solidified silt, the penetration depth in solidified silt is relatively shallow, and it is a non-uniform penetration process. The impact of penetration rate on the measured penetration resistance is very significant, and effective correction is required.

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