Long-term deformation testing method for rock under different stress components and application thereof
A stress component and deformation testing technology, which is applied in the direction of applying stable tension/pressure to test material strength, measuring devices, and analyzing materials, can solve the problem of inability to test rock sample volume deformation data for a long time, and achieve simple, convenient and accurate collection Effect
Active Publication Date: 2020-11-24
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI +1
View PDF8 Cites 3 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The purpose of the present invention is to solve the technical problem that the existing rock creep test device cannot test the volume deformation data of rock samples under constant internal pressure and constant external pressure for a long time, and provide a long-term deformation test method of rock under different stress components
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0042] The present invention will be further described below in conjunction with specific implementation and calculation methods.
[0043] Taking sandstone with a porosity of about 21.5% as the case object, the sandstone creep test was carried out under the conditions of confining pressure, axial pressure and pore water pressure, and the volumetric strain ε of the sample under the spherical stress component was obtained v The relationship curve with time and the axial deviatoric strain e under the deviatoric stress component 1 The relationship curve with time, the test method is carried out according to the following steps:
[0044] a Put a standard cylindrical rock sample with a diameter D of 49.70 mm and a height H of 100.02 mm into the sealing sleeve 18, place permeable gaskets on the upper and lower end surfaces, and fix the sealing sleeve 18 in the triaxial chamber 19. Between the indenter 1 and the base 2, two LVDTs (Linear Variable Differential Transformers) 3 are inst...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a long-term deformation testing method for rock under different stress components, and belongs to the field of rock mechanical property testing. According to the method, different motor servo pumps are used for loading and maintaining confining pressure, axial pressure and pore water pressure of a test rock sample respectively; constant internal pressure and constant external pressure loading modes under triaxial stress and pore water pressure conditions are realized; meanwhile, a piston position in a confining pressure motor servo pump is positioned to record the volume of oil in the pump; errors of volume deformation measurement of the test rock sample caused by piston displacement loss of the oil mass volume in a triaxial chamber in the axial loading process areeliminated through the cross sectional area and the axial displacement of an axial pressure head; volume strain data of the test rock sample under the conditions of constant internal pressure and constant external pressure are obtained by utilizing volume change data of oil mass in the pump, and the relationship between volume strain and bias strain along with time under two stress states of a ball stress component and a bias stress component is obtained through formula calculation in combination with axial deformation data. The invention further discloses application of the long-term deformation testing method.
Description
technical field [0001] The invention relates to a long-term deformation test method of rock under different stress components, which belongs to the category of rock mechanics property test. It is mainly used to study the evolution of volumetric strain and deviatoric strain over time under the two stress components of the spherical stress component and the deviatoric stress component, and to analyze the long-term stability of rock mass engineering and predict the aging deformation of rock mass engineering. Background technique [0002] The long-term deformation of rock has always been a direction of great concern in the field of rock mechanics. With the promotion of deep underground engineering in my country, the long-term stability and safety of rock mass engineering is the top priority of the project. Many underground engineering rock masses will have obvious deformation phenomenon that increases with time during the operation period or even the construction period. Among...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): G01N3/12
CPCG01N3/12G01N2203/0003G01N2203/0019G01N2203/0048G01N2203/0071G01N2203/0218
Inventor 郑虹闫生存陈涛袁鹏李萌徐怀胜刘畅柳秀洋
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI