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Calculation method and application of tensile strength of rock under confining pressure

A technology of tensile strength and calculation method, applied in the direction of strength characteristics, using stable tension/pressure testing material strength, instruments, etc., can solve the problem of no relationship between confining pressure and tensile strength, and unable to change the strength of rock tensile failure Prediction and other problems, to achieve the effect of simple and feasible methods

Active Publication Date: 2022-07-12
HEBEI UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are relatively few studies on the tensile strength of rocks under different confining pressure conditions, and there is no general criterion for the relationship between confining pressure and tensile strength, and it is impossible to analyze the changes in the tensile failure strength of rocks under confining pressure. make predictions

Method used

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  • Calculation method and application of tensile strength of rock under confining pressure
  • Calculation method and application of tensile strength of rock under confining pressure
  • Calculation method and application of tensile strength of rock under confining pressure

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Embodiment

[0032] This embodiment provides a method for calculating the tensile strength of rock under confining pressure conditions, including the following steps:

[0033] Step S1, performing tensile tests of the rock samples under different confining pressure conditions, and obtaining the tensile strengths of the rock samples under different confining pressures;

[0034] 1-1 Use granite to prepare rock samples, and process the rock samples into cylinders with a height of 100mm and a diameter of 50mm; the processing accuracy and surface flatness of the samples meet the national standard; Glue) to bond the metal ends with threaded holes respectively, and place them for 48 hours to achieve bond strength;

[0035] 1-2 Install the rock sample vertically on the tension-compression conversion device, and connect the metal ends of the rock sample at both ends with the connection ends of the upper and lower parts of the tension-compression conversion device through bolts respectively; then ins...

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Abstract

The invention discloses a method for calculating the tensile strength of rock under the condition of confining pressure. The method includes step S1, performing tensile tests of rock samples under different confining pressure conditions, and obtaining the tensile strengths of rock samples under different confining pressures; step S2, according to different confining pressures and their corresponding tensile strengths Perform data fitting to determine the constant values ​​related to the current rock material properties, and then calculate the current rock tensile strength under different confining pressure conditions according to the determined relationship between rock confining pressure and tensile strength. The relationship between rock confining pressure and tensile strength proposed by this method provides a basis for rock fracture identification, provides a benchmark for determining rock fracture by tensile strength, and provides stability control and instability early warning for engineering rock mass. Theoretical basis.

Description

technical field [0001] The invention relates to the technical field of rock mechanics research, in particular to a method and application for calculating the tensile strength of rock under confining pressure conditions. Background technique [0002] Rock tensile failure is often encountered in the construction and construction of most rock engineering, such as tunnel excavation, underground cavern construction, unloading of high and steep slopes, and mining. The process of rock fracture is often accompanied by large in-situ stress, that is, the rock will be subject to confining pressure, and the tensile failure under complex in-situ stress conditions is often more severe. etc. cause damage. At present, the rock fracture process is generally equivalent to a simple uniaxial tensile failure, and it is ignored that the rock will be subjected to confining pressure in the actual environment. Therefore, it is necessary to conduct in-depth research on the tensile strength of rock u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0003G01N2203/0017G01N2203/0019G01N2203/0067G01N2203/0256G01N2203/0676
Inventor 黄达刘洋岑夺丰宫凤强钟助
Owner HEBEI UNIV OF TECH
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