Test device for splitting tensile fracture under impact-static-hydraulic coupling effect of rock and test method

Abstract

The invention relates to a test device for splitting tensile fracture under an impact-static-hydraulic coupling effect of rock. The test device comprises a pressing rod device and a hydraulic loading device, wherein the hydraulic loading device comprises a hydraulic loading pressing head, a circular ring clamp, a connecting pipe and a pressurizing pump; the circular ring clamp is connected with a base fixed on the pressing rod device through a brace; the hydraulic loading pressing head is fixed in the circular ring clamp; a water outlet in an end face of the hydraulic loading pressing head is communicated with a water inlet in a side wall; the water inlet in the side wall of the hydraulic loading pressing head is connected with the pressurizing pump through the connecting pipe. In a test process, a tested piece is firstly fixed between an incidence rod and a transmission rod along a radial direction, an axial static loading device is utilized to apply static pressure to the tested piece, then hydraulic pressure is applied to the two axial ends of the tested piece, the pressurizing pump with a pressure gage is used for adjusting the hydraulic pressure to a preset value, and then a high-pressure air bottle is utilized to drive a bullet to strike the incidence rod so as to break the tested piece and lastly the data is collected for treatment analysis. According to the invention, the dynamic mechanic characteristics of the splitting tensile fracture of the rock under the impact-static-hydraulic coupling effect can be effectively researched. The test device provided by the invention has guiding significance for evaluating the damaging mechanism of the water-containing rock under dynamic and static loads.

Description

technical field [0001] The invention relates to a rock mechanics experiment device and an experiment method, in particular to an experiment device and an experiment method for splitting tensile failure mechanics under the coupling action of rock impact-static force-hydraulic pressure. Background technique [0002] Rock is an anisotropic material, which is reflected in the defects such as micro-cracks, voids, joints and holes distributed randomly inside it, and because the tensile strength of rock is much lower than the compressive strength, and the bedrock structure of water conservancy and hydropower projects and mine production The deformation failure often depends on the tensile mechanical properties of the rock. In the process of deep mining, when the rock is affected by a certain static stress and dynamic loads such as mining disturbances and even earthquakes, it will also be affected by groundwater, which will act on the rock in the form of water pressure. The deforma...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of test device and experimental method for rock impact-static force-hydraulic coupling splitting tensile failure, to solve the problem of rock splitting tensile failure under the impact-static force-hydraul

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