Test device and method for measuring shear wave velocity of rock core sample

Abstract

The invention provides a test device and method for testing transverse wave velocity of a rock core test sample. An alternating-current signal generator of the device is electrically connected with apower amplifier; the power amplifier is electrically connected with a half-wave rectifying module; a wave velocity tester is electrically connected with a first sensor and a second sensor respectively; the first sensor and the second sensor are fixedly arranged on the to-be-tested rock core test sample; a steady-state vibration exciter comprises a silicon steel sheet framework, an electromagneticcoil, a vibrating head and a balance mass block; the silicon steel sheet framework is fixedly arranged on the end surface of the to-be-tested rock core test sample; the electromagnetic coil is fixedlyarranged in the silicon steel sheet framework; the vibrating head is connected with one end of the silicon steel sheet framework through an elastic part; the balance mass block is positioned at the other end of the silicon steel sheet framework, and is fixedly connected with the vibrating head through a connecting rod; and the electromagnetic coil is electrically connected with the half-wave rectifying module. The test device can excite horizontal vibration on the to-be-tested rock core test sample, spreads the horizontal vibration along the axis of the rock core in the form of transverse waves, receives the horizontal vibration through the first sensor and the second sensor, sends the horizontal vibration to the wave velocity tester, calculates transverse wave velocity, is simple in structure, is low in cost, and is accurate in measurement.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and more specifically relates to a test device and method for measuring the shear wave velocity of a rock core sample. Background technique [0002] The propagation velocity of elastic waves (mainly longitudinal waves and shear waves) in rock mass is determined by factors such as rock lithology, fracture development degree, rock weathering degree and rock elastic modulus. It is an important physical parameter of rock mass, which can reflect the Engineering mechanical properties of rock mass. In engineering, collecting rock core samples from the engineering site, and then measuring the elastic wave velocity of the rock core samples indoors has become a technical means often used by engineers and technicians in this field. [0003] At present, the laboratory generally measures the elastic wave velocity of the core sample by the acoustic transmission method. This method uses piezoe...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a test device and method for measuring the shear wave velocity of rock core samples, so as to solve the problem of the need for piezoelectric ceramic acoustic wave transducers in the prior art when the acoustic wave transmission method is used to measure the shear wave velocity. The device is improved, and the processing is difficult, the measurement error is large, and the measurement effect is difficult to guarantee the technical problem

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