Research on anisotropic permeability and porosity of columnar jointed rock masses during cyclic loading and unloading based on physical model experiments

2020 ◽  
Vol 79 (10) ◽  
pp. 5433-5454 ◽  
Author(s):  
Zhiming Chao ◽  
Guotao Ma ◽  
Xiewen Hu ◽  
Gang Luo
Keyword(s):  
Cyclic Loading ◽  
Physical Model ◽  
Jointed Rock ◽  
Rock Masses ◽  
Anisotropic Permeability ◽  
Jointed Rock Masses ◽  
Model Experiments ◽  
Cyclic Loading And Unloading ◽  
Loading And Unloading

scholarly journals Investigation of Anisotropic Permeability and Porosity of CJRM considering Different Confinement Loading Pressures

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Zhiming Chao ◽  
Guotao Ma ◽  
Xiewen Hu ◽  
Yuzhe Zhu
Keyword(s):  
Physical Model ◽  
Jointed Rock ◽  
Model Tests ◽  
Laboratory Model ◽  
Anisotropic Permeability ◽  
Cyclic Loading And Unloading ◽  
Confinement Pressure ◽  
Physical Model Tests ◽  
Loading And Unloading ◽  
Dip Angle

An innovative method is proposed to prepare artificial columnar jointed rock masses (CJRM) with different columnar dip angles, and laboratory physical model tests are conducted to investigate anisotropic permeability and porosity characteristics of the prepared artificial CJRM. In the physical model experiment, permeability and porosity of artificial CJRM with different columnar dip angles is measured during three times cyclic loading and unloading of confinement pressure. Based on the results of the laboratory model tests, the Equivalent Continuum Media Model was applied to analyse anisotropic permeability of CJRM. The main conclusions are summarized as follows. In the first loading phase of confinement pressure, the impacts of confinement pressure on the anisotropic permeability of artificial CJRM, porosity, and the major and minor principle permeability coefficients (PPCs) are significant, while in the following stages of confinement pressure loading and unloading, the change of them is small, with stable value. Permeability of artificial CJRM gradually increases with rise of columnar dip angle, and the permeability anisotropy of artificial CJRM under low confinement pressure is higher than that under low confinement pressure.

Physical and numerical tests of the excavation walls in jointed rock masses

2014 ◽  
Vol 51 (5) ◽  
pp. 554-569 ◽  
Author(s):  
Moorak Son ◽  
Jaehyun Park
Keyword(s):  
Physical Model ◽  
Model Test ◽  
Earth Pressure ◽  
Jointed Rock ◽  
Physical Model Test ◽  
Rock Masses ◽  
Jointed Rock Masses ◽  
Rock Types ◽  
Joint Characteristics ◽  
Parametric Studies

This paper examines the magnitude and distribution of earth pressure on the support systems of open cuts in jointed rock masses. A physical model test was carried out using concrete blocks with man-made joints to represent a jointed rock mass. The model test was simulated numerically to provide a justifiable basis for extended numerical parametric studies. This study focused on the overall procedures of the physical model test, its numerical simulation, and extended numerical parametric studies. A comparison of the results from both the physical model test and numerical simulation confirmed that the applied numerical approach and methodology were suitable for further extended numerical parametric studies. The controlled parameters were the different rock types and joint characteristics including joint shear condition, joint spacing, and joint inclination angle. Results of the earth pressures from the numerical parametric tests in jointed rock masses were compared with Peck’s empirical earth pressure for soil ground. The comparison showed that the earth pressure in jointed rock masses can be very different from that in the soil ground. Accordingly, the effect of the rock types and joint characteristics needs to be considered when designing excavation support systems in jointed rock masses.

Anisotropic Permeability of Coal Subjected to Cyclic Loading and Unloading

2018 ◽  
Vol 18 (8) ◽  
pp. 04018093 ◽  
Author(s):  
D. S. Yang ◽  
X. Y. Qi ◽  
W. Z. Chen ◽  
S. G. Wang ◽  
J. P. Yang
Keyword(s):  
Cyclic Loading ◽  
Anisotropic Permeability ◽  
Cyclic Loading And Unloading ◽  
Loading And Unloading

Adjustable buttons for ACL graft cortical fixation partially fail with cyclic loading and unloading

2018 ◽  
Vol 27 (8) ◽  
pp. 2530-2536 ◽  
Author(s):  
J. Glasbrenner ◽  
C. Domnick ◽  
M. J. Raschke ◽  
T. Willinghöfer ◽  
C. Kittl ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Acl Graft ◽  
Cyclic Loading And Unloading ◽  
Loading And Unloading
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