Method of quantitatively determining damage degree of compact rock
A technology of compact rock and damage degree, applied in the field of rock engineering, can solve the problems of low accuracy and poor reliability, and achieve the effect of high accuracy and strong reliability
Inactive Publication Date: 2019-04-30
HOHAI UNIV
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Problems solved by technology
[0005] Purpose of the invention: Aiming at the problems of low accuracy and poor reliability in evaluating the damage degree of tight rock by using macroscopic mechanical parameters in the prior art, the present invention provides a method for quantitatively determining the damage degree of tight rock
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[0018] The technical scheme of the present invention will be further described below in conjunction with the drawings.
[0019] Such as figure 1 , The method for quantitatively determining the damage degree of tight rock of the present invention includes the following steps:
[0020] Step 1. Prepare a compact rock sample;
[0021] Select the dense rock to be studied and process it into a cylindrical sample with a height of 50mm and a diameter of 50mm. Remove visually defective samples.
[0022] Step 2. Measure the permeability k and porosity of the tight rock sample
[0023] The permeability k can be tested by the following process: put a dense rock sample in a pressure chamber, apply confining pressure, and after the confining pressure is stable, apply osmotic pressure and measure the gas permeability of the dense rock sample. Among them, the applied confining pressure value is selected according to the depth of the layer where the tight rock is located, and the confining pressure v...
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Abstract
The invention discloses a method of quantitatively determining the damage degree of a compact rock, which comprises the following steps: 1, a compact rock sample is prepared; 2, the permeability k andthe porosity phi of the compact rock sample are measured; 3, according to a cubic law and a Darcy's law for seepage, the relationship between the compact rock permeability k and an equivalent fracture width e is acquired to be k=e<2> / 12, and the equivalent fracture width of the compact rock is determined to be e= the square root of k*12; and 4, according to a real equivalent fracture width calculation formula, e'=e / phi, for the compact rock, the real equivalent fracture width e' of the compact rock is determined, wherein the equivalent fracture width is the quantitative evaluation index for the compact rock damage degree. With the compact rock real equivalent fracture width as an evaluation index, a method of quantitatively determining the damage degree of a compact rock is disclosed, themethod has the advantages of high accuracy, strong reliability, simplicity and economy, a new method and a scientific basis are provided for safety evaluation of related rock engineering, and an extremely large application role is plated in actual engineering.
Description
Technical field [0001] The invention relates to a method for quantitatively determining the damage degree of compact rocks, and belongs to the technical field of rock engineering. Background technique [0002] The quality of rock mass is an important guarantee for the safety of rock engineering. The degree of rock damage is an important criterion for measuring the quality of rock mass. How to determine the degree of rock damage is a difficult problem facing the safety of rock engineering. [0003] At present, many scholars mainly use the macro-mechanical parameters such as uniaxial strength, triaxial strength, shear strength, elastic modulus and deformation modulus to evaluate the degree of rock damage. The heterogeneity of rock makes the macro-mechanical parameters of rock have Larger dispersion, as an index to evaluate the degree of rock damage, has the disadvantages of low accuracy and poor reliability. However, there are technical and theoretical difficulties in accurately eva...
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IPC IPC(8): G01N33/24G01N15/08
CPCG01N15/082G01N15/0886G01N33/24
Inventor 王环玲姜自华徐卫亚苏佳盼
Owner HOHAI UNIV