Through type detector for soft soil in situ shear wave velocity testing

Abstract

The invention discloses a through type detector for soft soil in situ shear wave velocity testing. A coaxial cable (1) of the detector is used for transmitting signals and data; a connecting bar (2) is connected with a static force feeler lever or a drilling lever, and the static force feeler level or the drilling lever penetrates through the soil through a static force penetrometer or a drilling machine; a blade (3) is arranged on the other end of the connecting bar (2), a wire guide hole is formed in the blade, and the coaxial cable is allowed to penetrate through the wire guide hole; a pair of cantilever branch beams (5) extends from two sides of the wedge-shaped blade (3), and three groups of bender element sensors are respectively arranged on the lower ends of the cantilever branch beams (5); line type grooves are arranged in a pair of detachable cable protective layers (4), the cable protective layers are respectively covered outside the blades (3) and the cantilever branch beams (5), and the coaxial cable (1) is connected with the bender element sensors through the cable protective layers (4); and a pair of sensor protectors (7) is arranged on the inner sides of the bottoms of the cantilever branch beams (5) for protecting the bender sensors from being damaged. The through type detector for the soft soil in situ shear wave velocity testing has the characteristics of in situ, rapidness, accuracy and continuity.

Description

technical field [0001] The invention relates to a new method for measuring the in-situ shear wave velocity of soft soil, which belongs to the field of geotechnical engineering testing, which can well control the shear wave propagation direction and in-situ, rapidly and continuously measure the shear wave propagation velocity in situ Test penetrating detectors. Background technique [0002] The shear wave velocity refers to the propagation velocity of the vibration shear wave in the soil, which reflects the small strain dynamic characteristics of the soil. According to the theory of elasticity, the maximum shear modulus G of soil max It is closely related to the density and shear wave velocity of soil, while the maximum shear modulus is the basic parameter to characterize the dynamic characteristics of soil, and is an indispensable content in soil dynamic calculation and site seismic safety evaluation. Therefore, the shear wave velocity test is usually used to calculate the...

AI Technical Summary

Problems solved by technology

The natural soil layer has large anisotropy and complex and variable sedimentary characteristics, so it has a significant impact on the shear wave velocity test value, making the meaning of the shear wave velocity test results provided by the in-situ test method often not clear enough, so engineering practice Some simplifying assumptions need to be made in the application, which will actually lead to errors in the evaluation of the dynamic characteristics of the soil

In addition, the existing shear wave velocity in-situ test methods generally use artificial seismic sources, which are also affected by human factors, and the repeatability is not high.

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