Method for Determining Change Point of Loading and Unloading Response Ratio in Rock Uniaxial Compression Test
A uniaxial compression test, loading and unloading response ratio technology, applied in the direction of applying stable tension/pressure to test material strength, instruments, measuring devices, etc., can solve safety accidents, inaccurate identification of loading and unloading response starting point, loading and unloading Respond to problems such as the inability to accurately quantify the starting point to achieve the effect of protecting safety
Active Publication Date: 2021-08-03
CENT SOUTH UNIV
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[0004] The purpose of the present invention is to provide a method for determining the change point of the loading-unloading response ratio in the rock uniaxial compression test, so as to solve the problem that the starting point at which the existing loading-unloading response ratio begins to rise cannot be accurately quantified and the rock uniaxial compression staged loading In the unloading test, the inaccurate identification of the starting point where the loading-unloading response ratio begins to rise leads to safety accidents
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Embodiment 1
[0040] Taking blue sandstone as an example, determine the change point of loading and unloading response ratio of blue sandstone uniaxial compression test, the specific process is as follows:
[0041] Step1: Process the rock block retrieved from the project site into a cylindrical rock sample with a diameter of 50 mm and a length of 100 mm, and take a cylindrical rock sample for a conventional uniaxial compression test on an MTS815 electro-hydraulic servo material testing machine to The loading rate is 12KN / min in the force-controlled loading method, and the stress-strain curve is obtained. The peak value of the axial stress of the rock sample is 80.1MPa, so the uniaxial compressive strength σ of the blue sandstone sample is c =80.10MPa.
[0042] 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 6.4MPa and 9.6MPa, and the load of each level is 3.2MPa high...
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The invention discloses a method for determining the change point of the loading and unloading response ratio in a rock uniaxial compression staged loading test. First, the rock block is processed into a cylindrical sample; the uniaxial compression test is carried out to obtain its stress-strain curve; The peak value of the axial stress of the sample is taken as its uniaxial compressive strength σ c ; Carry out uniaxial compression graded loading and unloading test on another cylindrical sample at the same loading rate, and get the stress-strain curve of the rock sample by graded loading and unloading, and determine the peak points of loading and unloading at each level accordingly; The slope of the data points in the loading section and unloading section of each level of loading and unloading test is legally fitted, the ratio of the two slopes is the loading and unloading response ratio of each level, and the variation curve of the loading and unloading response ratio with axial strain is drawn; determine the loading and unloading response ratio step by step The starting point of the level rise is the change point of the loading and unloading response ratio. The problem that the starting point of the loading-unloading response ratio cannot be accurately quantified and the safety accident caused by inaccurate identification of the starting point are solved.
Description
[0001] This application requires submission to the Chinese Patent Office on February 2, 2019. The application number is 201910108064.6. The application name is "a method for determining the change point of loading and unloading response ratio in rock uniaxial compression staged loading and unloading tests". priority, the entire contents of which are incorporated by reference into this application. technical field [0002] The invention belongs to the technical field of rock failure discrimination, in particular to a method for determining the change point of loading and unloading response ratio in rock uniaxial compression test. Background technique [0003] The load-unload response ratio (Load-Unload Response Ratio, LURR) theory is a theory to study the nonlinear failure precursor and failure prediction of rock or rock mass. At present, the load-unload response ratio theory has made a series of progress in the instability prediction of nonlinear systems such as earthquakes ...
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IPC IPC(8): G01N3/12
CPCG01N3/12G01N2203/0019G01N2203/0048G01N2203/0252
Inventor 宫凤强吴晨李夕兵
Owner CENT SOUTH UNIV