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Method of calculating elastic strain energy density of rock material at compression test peak strength point

A technology of elastic strain energy and peak strength, applied in the field of rock engineering, can solve problems such as the inability to obtain elastic strain energy density of rock materials

Inactive Publication Date: 2018-02-16
CENT SOUTH UNIV
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Problems solved by technology

[0003] The present invention provides a method for calculating the elastic strain energy density of rock materials at the peak strength point of the compression test. The elastic strain energy density of the problem

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  • Method of calculating elastic strain energy density of rock material at compression test peak strength point
  • Method of calculating elastic strain energy density of rock material at compression test peak strength point
  • Method of calculating elastic strain energy density of rock material at compression test peak strength point

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Embodiment 1

[0036] Taking Shandong red sandstone as an example, the calculation method of the elastic strain energy density at the peak strength point of the rock material is further explained, and the following operations are performed:

[0037] Step1: Process the rock block retrieved from the project site into a cylindrical rock sample with a diameter of 50mm and a length of 100mm. The conventional static load uniaxial compression test of the rock sample is carried out on the INSTRON-1346 electro-hydraulic servo material testing machine. The machine control mode is displacement control, and the loading rate is 0.065mm / min. Three conventional static load uniaxial compression tests were carried out to obtain the stress-strain curve of the rock sample, and the compressive strength values ​​were 97.29MPa, 100.55MPa, and 94.84MPa respectively; the average value was taken to obtain the uniaxial compressive strength of the red sandstone Intensity σ c =97.56 MPa.

[0038] Step2: Set five unlo...

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Abstract

The invention discloses a method of calculating elastic strain energy density of a rock material at a compression test peak strength point. The method is characterized in that different stress levelsare set to perform single loading-unloading test on a rock sample, a breakthrough discovery is made that good linear relationship between density Ue of elastic strain energy stored in the rock sampleand density U of total input energy at unloading points of different stress levels is achieved, and a function relation Ue=aU+b is met; the density of total input energy of the rock sample reaching the peak strength point may be solved a stress-strain curve before peak, the proposed linear function relation is used to perform calculating so that the value of the elastic strain energy density of the rock sample at the peak strength point is obtained. The method has the advantages that the problem is solved that the elastic strain energy density cannot be calculated according to an unloading curve since unloading fails for the rock sample when reaching the peak strength point, and conditions are created for more accurately calculating the peak elastic energy index of the rock material and its residual elastic strain energy index.

Description

technical field [0001] The invention belongs to the field of rock engineering and relates to a method for calculating the elastic strain energy density of a rock material at the peak strength point of a compression test. Background technique [0002] The failure of rock materials is an instability phenomenon driven by energy, and the rock materials are always accompanied by energy accumulation and dissipation in the process of compression. When loaded to the peak strength of the rock, the rock will fail. Accurately evaluating the ability of the rock material to store elastic strain energy when it reaches the peak strength is of great significance for the study of the failure of the rock material. At present, the rock sample is unloaded before it is loaded to the peak strength. According to the stress-strain curve of loading and unloading, the total input energy density at the unloading point, the stored elastic strain energy density and the dissipated energy density during l...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 宫凤强闫景一李夕兵罗松
Owner CENT SOUTH UNIV
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