Portable piezoelectric ceramic bending element soil body shear wave speed test device

Abstract

The invention discloses a portable device for testing shear wave velocity of a soil mass by piezoceramic bender elements. An exciting sensor and a receiving sensor with the same structure are respectively inserted into the soil mass; one terminal of a linear amplifier and one terminal of a divider circuit are connected with a terminal of the exciting sensor; the other terminal of the linear amplifier and the other terminal of the divider circuit are respectively connected with a first terminal and a third terminal of a sound card in a portable computer; one terminal of a charge amplifier is connected with the terminal of the receiving sensor, and the other terminal of the charge amplifier is connected with the third terminal of the sound card in the computer. The designed testing sensor can ensure a good working state of the piezoceramic bender elements, can be applicable to the testing requirements of the soil mass with different rigidities and types, and has the advantages of definite principle, simple structure and convenient fabrication and use; a testing system is established by adopting the portable computer, the small linear amplifier and the small charge amplifier which are dedicated to bender element testing, thus ensuring higher portability of the system.

Description

technical field [0001] The invention relates to a shear wave velocity testing device, in particular to a portable piezoelectric ceramic bending element soil shear wave velocity testing device. Background technique [0002] Piezoelectric ceramic bending element testing soil sample wave velocity has the advantages of simple principle and convenient operation, and it is widely installed in various indoor geotechnical test equipment for the measurement and research of small strain shear modulus of soil samples. In 2002, Zhejiang University developed a soil sample wave velocity test device with a piezoelectric ceramic bending element installed in a triaxial chamber and applied for a patent (patent number: 02261611.X). Soil sample wave velocity testing device of ceramic element (patent number: 200520013094.2), but there is no testing method and corresponding device directly using piezoelectric ceramic bending element to test soil wave velocity on site at home and abroad. The on-s...

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Problems solved by technology

In the past, methods such as single-hole method, cross-hole method, or surface wave analysis method were mainly used for on-site soil wave velocity testing. These methods generally have the disadvantages of complicated operation procedures and high costs, and their application is greatly restricted.

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