Miniature free fall disc type dynamic sounding device for testing undrained shear strength

Abstract

The invention provides a miniature free fall disc type dynamic sounding device for testing undrained shear strength. A probing rod (3) is arranged in the center of the device; a coaxial cable (1) is arranged in the middle of the probing rod (3); a magnetic clamp (2) is arranged at the top of the probing rod (3); four symmetrical stable tail wings (4) are arranged on a lower portion of the magnetic clamp (2); the stable tail wings (4) are used for guaranteeing the spatial stability of the device during free fall; a first weight (5.1) and a second weight (5.2) are arranged on a lower portion of each stable tail wing (4); a middle lower portion of the probing rod (3) is externally provided with rough grain (6); a disc type conical head (7) is arranged at a bottom end of the probing rod (3), and a conical head resistance sensor (8) is arranged within the disc type conical head (7); the coaxial cable (1) penetrates through the whole probing rod (3), and is connected with the conical head resistance sensor (8). The miniature free fall disc type dynamic sounding device is small in size, simple to use, convenient, fast, accurate, and high in repeatability, and therefore, a powerful detection tool is provided for geotechnical engineering investigation practices.

Description

technical field [0001] The invention relates to a miniature self-falling disk type dynamic penetrating sounding device for testing undrained shear strength, which belongs to a new evaluation method for undrained shear strength in the field of civil engineering. Background technique [0002] CPT technology refers to the use of a pressure device to press a penetrating rod with a probe into the test soil layer, and to test the cone tip resistance and side wall friction resistance of the soil through the measurement system, so as to determine a certain value of the soil. Some basic physical and mechanical properties, such as the undrained shear strength of the soil, the allowable bearing capacity of the soil, etc. Pore ​​pressure static penetration testing (CPTU) installs a pore pressure sensor on the traditional static penetration testing device, which not only tests the cone tip resistance and side wall friction resistance of the soil, but also tests the pore water pressure. P...

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Problems solved by technology

However, this kind of static penetration is penetrated by the ballast of static pressure equipment, which has the disadvantages of long time consumption, high cost and limited application range.

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