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Method for determining effective stress coefficients of rock

A technique of effective stress and coefficient, applied in the application of stable tension/pressure test material strength, measurement device, suspension and porous material analysis, etc. Achieve the effect of reducing analysis error, improving calculation accuracy, and accurate and reliable calculation results

Active Publication Date: 2017-08-22
HOHAI UNIV
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Problems solved by technology

[0003] At present, Biot coupling theory is mostly used in the study of seepage stress coupling in porous media, where α is the effective stress coefficient or Biot coefficient, which is used to describe the coupling state of seepage stress. For rock problems, its value range is 0

Method used

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  • Method for determining effective stress coefficients of rock
  • Method for determining effective stress coefficients of rock
  • Method for determining effective stress coefficients of rock

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Embodiment

[0055] The breccia lava was used as the test rock sample to carry out the cyclic loading and unloading test. The specific loading scheme is shown in Table 1 below.

[0056] Table 1 Breccia lava loading and unloading test scheme

[0057]

[0058]

[0059] The method for determining the effective stress coefficient of breccia lava includes the following steps:

[0060] Step 1: Prepare the breccia lava sample required for the test, the sample is a standard cylindrical rock sample of Φ50mm×100mm, measure the size of the sample, and number the sample, as shown in Table 2;

[0061] Step 2: Put the breccia lava rock sample into the pressure chamber, load the confining pressure to 5MPa, 10MPa and 15MPa respectively, keep the confining pressure, and carry out cyclic loading and unloading tests under different deviatoric stress conditions, and load the deviatoric stress to the values ​​listed in Table 1 Unloading starts after the set value shown; after the deviatoric stress unloa...

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Abstract

The invention discloses a method for determining effective stress coefficients of a rock. The method comprises the steps of preparing a rock test sample and measuring and recording the size of the rock sample; loading the rock sample into a pressure chamber of a triaxial servometer, loading confining pressure to a predetermined value, keeping the confining pressure, constantly loading bias, loading the bias to a set value, unloading, keeping the bias and the confining pressure constant and loading pore water pressure; repeating the previous step and loading the bias until the rock sample is destroyed; drawing a relation curve of bias increments and axial / circumferential strain increment under different confining pressure and carrying out data fitting on the curve to obtain an effective elastic modulus E1 and poisson ratio v31 related to bias grades; and calculating an axial effective stress coefficient and a circumferential effective stress coefficient of the rock sample through a formula. The effective stress coefficients obtained through the method are accurate and reliable, and can be applied to numerical calculation of seepage and stress coupling in practical engineering, the calculation accuracy is greatly improved and the analysis error is reduced.

Description

technical field [0001] The invention belongs to the field of rock mechanics, and in particular relates to a method for determining the effective stress coefficient of rock. Background technique [0002] The interaction between seepage field and stress field of rock mass is of great significance to the stability and safety of the project. During the construction of high dams, the excavation of high slopes and underground caverns will cause changes in the original stress field in the dam site area. The abutment rock mass is affected by stress field and seepage field. The rock mass will deform under the action of external force, which will cause the cracks and pores in the rock mass to open or close, and the seepage characteristics of the cracked rock mass will change; when water seepage occurs in the rock mass, osmotic pressure will be generated, and the rock mass will Changes in the stress field cause changes in the deformation law of the rock mass fissure surface. Its see...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12G01N15/08
CPCG01N3/12G01N15/0826
Inventor 王环玲赵恺徐卫亚冉少鹏向志鹏夏季
Owner HOHAI UNIV
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