Bar-type probe for detecting undrained shear strength of soft clay and calculation method

Abstract

The invention belongs to the field of ocean engineering foundation investigation and discloses a bar-type probe for detecting the undrained shear strength of soft clay and a calculation method. The bar-type probe comprises a bar-type end. A probe rod is connected to the center of the rectangular cross section of the bar-type end. A force measurement unit is mounted in the position, close to the bar-type end, of the lower end of the probe rod. A resistance type force sensor or an optical fiber force sensor is selected as the force measurement unit. The bar-type probe is used for conducting static cone penetration testing on soft clay to measure the penetration resistance of the bar-type probe penetrating into the soft clay, so that the range of the undrained shear strength of the soft clay is calculated through a formula. The failure mechanism of the bar-type probe can eliminate the influence of the overlying earth pressure and the pore water pressure without extra correction. The projected area of the bar-type probe is greater than that of a cone type probe and can obtain the more accurate undrained shear strength. A strict theoretical resolution is formed between the penetration resistance of the bar-type probe and the undrained shear strength of the soft clay. Accordingly, the influence of artificial experience factors on the calculation result is greatly reduced.

Description

technical field [0001] The invention belongs to the field of marine engineering foundation survey, and in particular relates to an in-situ static penetration probe for detecting the undrained shear strength of soft clay and a calculation method for detecting the undrained shear strength of soft clay. Background technique [0002] my country's current standards stipulate that areas with a water depth greater than 500 meters are called "deep sea areas." Deep sea marine engineering structures are very different from shallow sea structures in terms of structural form, bearing characteristics, and foundation performance, and the requirements for soil parameters in design and construction are also different. Therefore, it is of great significance to accurately obtain the strength parameters of the shallow surface soil of the deep seabed to ensure the safety and stability of deep sea marine structures. [0003] Due to the unique sedimentary characteristics of the deep sea, the sha...

AI Technical Summary

Problems solved by technology

The operation of triaxial compression test is complex and the test period is long

However, the measured value of the cross-plate shear test tends to the residual strength, which cannot reflect the real peak strength of the soil, and has a large dispersion, which is easily affected by the degree of soil disturbance.

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