True triaxial multi-field multi-phase coupling dynamic test system and method

Abstract

The invention discloses a true triaxial multi-field multi-phase coupling dynamic test system and method. One end of an incident rod and one end of a transmission rod are fixed to the two ends of a triaxial loading device respectively; the triaxial loading device is a hexahedron, comprises three pressure device sets opposite to each other in pairs and is capable of separately controlling over compression and unloading of all faces of rock samples and changing the prestress loading value of six oil cylinders freely, both the incident rod and the transmission rod are provided with strain gages beneficial for measuring mechanical property of the rock samples when the rock samples are impacted; furthermore, a temperature effect test system and a chemical effect test system are additionally arranged, the temperature field and chemical field where the rock samples are located are changed by adjusting the temperature of the system and injecting different chemical solvents and various gas, meanwhile, the stress field borne by the rock samples is combined, the mechanical characteristics of the rock samples under the multi-field multi-phase coupling action of the stress field, the temperature field, the chemical field, solid, liquid, gas and the like, and data and theoretical supports are provided for follow-up studies.

Description

technical field [0001] The invention relates to a true three-axis multi-field multi-phase coupling dynamics test system and method, belonging to the technical field of mechanical performance testing. Background technique [0002] The experimental research on the three-dimensional dynamic characteristics of rock materials is a very important field in rock impact dynamics, and it is also a hot spot in current research. By summarizing the development of the three-axis SHPB (Hopkinson pressure bar) rock mechanics testing machine, and comparing the characteristics of various testing machines. Comprehensively analyzed the research literature related to the triaxial SHPB test, and summarized some common rules: ① Under a certain confining pressure, the dynamic compressive strength of the rock will increase with the increase of the strain rate, showing a linear function or an exponential function increase form, and the brittleness is weakened, and the plasticity is significantly inc...

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Problems solved by technology

[0004] The existing conventional three-axis SHPB testing machine is designed with reference to the working principle of the static testing machine, that is, on the basis of the ordinary SHPB testing machine, a device for adding confining pressure is designed, and the impact test is performed after applying the confining pressure. This method is called In the pseudo-triaxial rock dynamics test device, the applied confining pressure is the same in both axial directions, and the unloading of the confining pressure is also unloaded at the same time; but this is only an ideal situation, compared with the actual situation in the mine Large, in most cases in mines, rocks are subjected to different forces in all directions, and when the pressure is released, all directions will not be unloaded at the same time, which will lead to a large gap between the sample test and the actual situation, making the test measurement incomplete. Unable to provide data support for follow-up research

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