Method for determining fracture closure stress of rock under uniaxial compression condition

A technology of crack closure stress and uniaxial compression, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problem that the value of crack closure stress is no longer objective, and achieve the effect of easy popularization and application and uniqueness

Inactive Publication Date: 2014-04-30
BEIJING RES INST OF URANIUM GEOLOGY
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Problems solved by technology

However, this method is largely subjective, and it strongly relies on the user's visual judgment of this intersection point, and the resulting crack closure stress value is no longer objective

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  • Method for determining fracture closure stress of rock under uniaxial compression condition
  • Method for determining fracture closure stress of rock under uniaxial compression condition
  • Method for determining fracture closure stress of rock under uniaxial compression condition

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0026] Such as figure 1 As shown, a method for determining the crack closure stress of rock under uniaxial compression conditions includes the following steps in turn:

[0027] Step S1: preparing a cylindrical rock specimen;

[0028] Step S2: Use a rock mechanics testing machine to perform uniaxial loading on the rock specimen until the specimen is destroyed; collect the axial stress σ in real time 1 The corresponding axial strain ε 1 and hoop strain ε 3 data;

[0029] Step S3: Obtain the volumetric strain ε v =ε 1 +2ε 3 ;

[0030] Step S4: obtaining a relationship curve between volumetric strain and axial stress and a relationship curve between axial strain and axial stress;

[0031] Step S5: Obtain the crack damage intensity σ cd , the crack damage intensity σ cd In the relationship curve between volumetric strain and axial stress...

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Abstract

The invention relates to the field of rock performance tests, in particular to a method for determining the fracture closure stress of a rock under the uniaxial compression condition. The method comprises the following steps: a, processing a rock sample; b, mounting the rock sample on a sample table of a pressure machine; c, uniaxially loading the sample according to a load control mode until the sample is damaged; d, calculating the volume stress of the sample; e, determining the fracture damage intensity in a volume stress-axial stress curve; f, determining a fracture damage intensity point in an axial stress-axial stress curve, and connecting the point with a zero point to form a reference line; g, calculating the difference between the stress value on the axial stress-axial stress curve and the stress value corresponding to the reference line under the same stress level from the beginning of the zero point to the ending of the fracture damage intensity; h, drawing a relational scatter diagram of the axial strain difference and the axial stress, wherein the stress corresponding to the peak value of the axial strain difference is the fracture closure stress of the rock. The method is applicable to rock mechanics tests in the service of underground construction.

Description

technical field [0001] The invention belongs to the field of rock performance testing, and relates to a method for determining the crack closure stress of rocks under uniaxial compression conditions, in particular to a rock mechanics test suitable for underground engineering services using axial strain differences to determine the rock's uniaxial stress. Method for crack closure stress under axial compression. Background technique [0002] The mechanical failure process of rock is the process of initiation, expansion and penetration of internal micro-cracks. The damage and failure process under compression can be divided into several important stages: (1) crack closure; (2) elastic deformation; (3) crack initiation; (4) crack stable development; (5) crack penetration; (6) Unsteady fracture development; (7) Destruction; (8) Post-destruction stage. Among them, the stress level corresponding to fracture closure is called rock fracture closure stress. Fissure closure stress i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/00
Inventor 赵星光马利科李鹏飞谢敬礼宗自华苏锐王驹
Owner BEIJING RES INST OF URANIUM GEOLOGY
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