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Rockburst tendency grade discrimination method based on uniaxial compression hysteresis ratio index

A technology of uniaxial compression and grade discrimination, applied in the field of grade discrimination, can solve the problems of excavation face damage, casualties, equipment damage, etc., and achieve the effect of solving serious damage

Active Publication Date: 2019-07-23
CENT SOUTH UNIV
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Problems solved by technology

[0004] The object of the present invention is to provide a kind of method for discriminating rockburst tendency grade based on uniaxial compression hysteresis ratio index, carry out uniaxial compression test to rock sample, determine hysteresis ratio T R , in order to identify the rockburst tendency of the rock, and to solve the problems of serious damage to the excavation face, equipment damage and casualties caused by rockburst

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  • Rockburst tendency grade discrimination method based on uniaxial compression hysteresis ratio index
  • Rockburst tendency grade discrimination method based on uniaxial compression hysteresis ratio index
  • Rockburst tendency grade discrimination method based on uniaxial compression hysteresis ratio index

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Embodiment 1

[0040] Taking the blue sandstone as an example, the conventional uniaxial compression test of the blue sandstone was carried out on the MTS815 electro-hydraulic servo material testing machine to judge the rockburst tendency of the blue sandstone. First calculate the uniaxial compression lag ratio T R , and then judge the rockburst tendency grade of the green sandstone according to the lag ratio index, as follows:

[0041] (1): The rock blocks retrieved from the project site were processed into cylindrical rock samples with a diameter of 50 mm and a length of 100 mm. The rock samples were subjected to a uniaxial compression test on an MTS815 electro-hydraulic servo material testing machine at a loading rate of 12KN / min force control loading method is used to load, and the axial strain and lateral strain of the rock under uniaxial compression conditions are measured.

[0042] (2): The volume strain of the rock is obtained by the sum of the axial strain and the lateral strain, a...

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Abstract

The invention discloses a rockburst tendency grade discrimination method based on an uniaxial compression hysteresis ratio index. The method comprises the following steps: firstly, processing a rock block into a cylindrical test sample, and performing a uniaxial compression test until the rock test sample is destroyed; drawing an axial stress-axial strain curve and an axial stress-lateral strain curve of the rock test sample, and figuring out rock volumetric strain; drawing an axial stress-volumetric strain curve of the rock test sample, determining inflection points of volumetric strain in sequence, using the axial stress corresponding to the inflection points as the damage strength of the rock test sample, using an axial stress-axial strain point corresponding to the damage strength as arock uniaxial compression starting point, setting an interval time between the rock uniaxial compression starting point and a peak strength point of the rock test sample as a hysteresis time T1, setting the interval time between an initial loading point and the peak strength point of the rock test sample as a uniaxial compression time T2, calculating a hysteresis ratio TR according to T1 and T2,and discriminating the rockburst tendency grade to prevent excavation working face damage, equipment damage and casualties caused by rockburst.

Description

[0001] This application claims the priority of a Chinese patent application with the application number 201910108066.5 submitted to the China Patent Office on February 2, 2019, and the application name is "A method for discriminating rockburst tendency grades based on uniaxial compression hysteresis ratio index". The entire contents are incorporated by reference in this application. technical field [0002] The invention belongs to the technical field of rockburst tendency grade discrimination, in particular to a rockburst tendency grade judgment method based on a uniaxial compression hysteresis ratio index. Background technique [0003] Rockburst is the sudden destruction of the surrounding rock mass in rock engineering, accompanied by the sudden release of strain energy in the rock mass, which is a phenomenon of instability in the rock fracture process. Rockburst often causes serious damage to the excavation face, equipment damage and casualties. The study of rockburst ten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12
CPCG01N3/12G01N2203/0019G01N2203/0048G01N2203/0252
Inventor 宫凤强吴晨闫景一李夕兵
Owner CENT SOUTH UNIV
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