Dynamic shearing and friction measuring device and method based on Hopkinson pressure bar

Abstract

The invention discloses a dynamic shearing and friction measuring device based on a Hopkinson pressure bar. The dynamic shearing and friction measuring device comprises a split Hopkinson pressure bar, a dynamic shearing and friction device and a cylindrical confining pressure cylinder, the split Hopkinson pressure bar comprises a transmitting device, and a waveform shaper, an incident bar, a transmission bar and an axial preloading device which are separated from the transmitting device; and the dynamic shearing and friction device is arranged at the joint of the incident rod and the transmission rod and is used for placing a sample, the cylindrical confining pressure cylinder is sleeved on the dynamic shearing and friction device, and the cylindrical confining pressure cylinder and the axial preloading device are communicated with the oil cylinder through oil pipes. The invention further discloses a measuring method of a dynamic shearing and friction measuring device based on a Hopkinson pressure bar. The dynamic shear and friction measuring device based on the Hopkinson pressure bar aims at solving the problems of how to measure the dynamic shear performance and the internal friction angle phi value of a rock sample under different loading rates and different normal stress conditions and how to measure the dynamic friction performance at the same time.

Description

technical field [0001] The invention belongs to the technical field of dynamic physical and mechanical measurement of rocks, and in particular relates to a dynamic shear and friction measurement device and a measurement method based on a Hopkinson pressure bar. Background technique [0002] In geotechnical and geophysical applications involving different scales, rocks may fail due to dynamic loading by drilling, blasting, landslides or earthquakes. According to statistics, dozens of earthquakes that can cause serious harm to humans occur on the earth every year. Earthquakes often cause serious casualties, and may also cause secondary disasters such as tsunamis, landslides, landslides, and ground fissures. The occurrence of earthquakes involves physical processes such as seismogenic nucleation, fault instability, and rupture propagation, which are highly complex. Most earthquakes in the earth's crust occur along the original faults, and the rock friction experiment is one of...

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Problems solved by technology

However, this method is not suitable for rock-like materials due to the special way in which the normal pressure is applied

[0004] In the 1970s and 1980s, based on the results of low-velocity rock friction experiments, James Dieterich, Andy Ruina, and James Rice established the rate-state variable friction constitutive relation. Applied to seismic simulations, but this does not reflect well the effect of loading rates on rock dynamic constitutive parameters

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