Loading and unloading response hysteresis ratio index-based rockburst tendency grade judging method
A technology of loading and unloading response ratio and level discrimination, applied in the field of level discrimination, can solve problems such as equipment safety accidents
Active Publication Date: 2019-07-23
CENT SOUTH UNIV
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[0005] The object of the present invention is to provide a rockburst tendency grade discrimination method based on the loading and unloading response hysteresis ratio index, to predict the rockburst tendency grade, to solve the problems caused by rockbursts during deep rock engineering excavation. Equipment security incidents
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Embodiment 1
[0050] Taking green sandstone as an example, first calculate the loading and unloading response hysteresis ratio index T R , and then according to the test results of 10 kinds of rocks, the rockburst tendency grade of the green sandstone is judged, as follows:
[0051] Step1: Process the rock blocks retrieved from the project site into cylindrical rock samples with a diameter of 50 mm and a length of 100 mm, and take three rock samples of the same specification for uniaxial compression tests on the MTS815 electro-hydraulic servo material testing machine to determine Loading rate is 12KN / min force control loading method loading, the uniaxial compressive strength of blue sandstone samples are 83.24MPa, 76.86MPa, 80.19MPa respectively, and the average uniaxial compressive strength is σ c =80.10MPa.
[0052] step2: According to the uniaxial compressive strength σ obtained in step1 c Determine the value of the first-level load as 3.2MPa, the second-level and third-level loads as ...
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Abstract
The invention discloses a loading and unloading response hysteresis ratio index-based rockburst tendency grade judging method. According to the method, a rock is firstly processed into a cylindrical rock sample, uniaxial compression test is carried out on the cylindrical rock sample until the cylindrical rock sample is damaged to obtain a stress-strain curve, and an axial stress peak is taken as uniaxial compressive strength; uniaxial compression graded loading and unloading test is carried out on another sample via the same loading velocity so as to obtain a graded loading and unloading stress-strain curve of the sample, and each grade of loading and unloading peak point is determined according to the graded loading and unloading stress-strain curve; each grade of loading and unloading response ratio is determined and a loading and change curves of the unloading response ratios along with the axial strain are drawn so as to determine a loading and unloading response changing point ofthe rock sample; and a hysteresis time T1 between the changing point and the peak strength point of the rock sample and a time T2 from an initial loading point to the peak strength point of the rock sample are calculated, a hysteresis ratio TR is calculated according to TR=T1 / T2 and the rockburst tendency grade of the rock sample is judged according to the hysteresis ratio. According to the method, the problem that rockburst is generated by rock excavation so as to cause accidents is solved.
Description
[0001] This application claims the priority of the Chinese patent application submitted to the China Patent Office on February 2, 2019, with the application number 201910108060.8 and the application name "A Method for Discriminating Rockburst Tendency Grades Based on Loading and Unloading Response Lag Ratio Index", The entire contents of which are incorporated by reference in this application. technical field [0002] The invention belongs to the technical field of rockburst tendency grade discrimination, and in particular relates to a rockburst tendency grade judgment method based on a loading and unloading response lag ratio index. Background technique [0003] Rockburst is a dynamic failure phenomenon often encountered in deep rock engineering excavation. Rockbursts are not uncommon in deep mine mining, rail transit, water conservancy and hydropower and other geotechnical engineering. When a rockburst occurs, there are often phenomena such as rock chip ejection, bursting...
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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