A pressure penetration penetrator based on a spherical full-flow hole and its consolidation coefficient evaluation method

Abstract

The invention discloses a full flow pore pressure sounding penetrometer based on a ball shape and a consolidation coefficient evaluation method of the full flow pore pressure sounding penetrometer based on the ball shape. A pore pressure static sounding feeler lever (5) is arranged at the upper portion of the penetrometer, and the lower portion of the pore pressure static sounding feeler lever (5) is sequentially connected with a conversion head (6), a full flow sounding feeler lever (4) and a full flow sounding ball-shaped probe (1). Multiple pore pressure sensors (2) are arranged in the full flow sounding ball-shaped probe (1) along the transverse circumference. Pore pressure filtering rings (3) are arranged outside the pore pressure sensors (2). A pore pressure sensor (2) is arranged at the connecting position of the bottom end of the pore pressure static sounding feeler lever (5) and the conversion head (6), wherein a pore pressure filtering ring (3) is arranged outside the pore pressure sensor (2). The full flow pore pressure sounding penetrometer penetrates into soil continuously at a constant speed, penetration resistance and pore water pressure dissipation data can be obtained, the beneficial effects of the in-situ property, directness, rapidness, accuracy, economic efficiency and the like can be achieved for evaluating soft soil consolidation coefficients, and a forceful measuring tool is provided for the geotechnical engineering foundation treatment practice.

Description

technical field [0001] The invention relates to a consolidation coefficient evaluation method based on a spherical full-flow hole pressure penetration penetrator, which belongs to an in-situ testing method capable of directly and continuously analyzing and testing plant root system reinforced soil in the field of geotechnical engineering. Background technique [0002] Consolidation coefficient is a very important index of soil in geotechnical design. Consolidation coefficient is usually obtained by testing undisturbed soil indoors. However, in the subsea environment, the integrity and undisturbed nature of the sample cannot be guaranteed during sampling and transportation, so it is best obtained during in situ testing. At present, the most common method for measuring the in-situ consolidation coefficient is pore pressure static penetration testing, and the soil consolidation coefficient is calculated by dissipating 50% of the pore water pressure at the penetration position. ...

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Problems solved by technology

But this method takes a very long time. Generally speaking, it takes several hours or even longer to dissipate to 50%

In marine geotechnical engineering investigation, the cost per day is as high as 500,000 yuan, and this test method is obviously uneconomical

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