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The effect of principal stress orientation on tunnel stability
Highlights Regular tunnels and cracked tunnels under compressions have been studied. Cement mortar and sandstone were used to make tunnel models, and compression tests were conducted. ABAQUS code was applied in the calculation of crack tip stress intensity factor. Photoelastic experiments were implemented.
Abstract In order to investigate the effect of principal stress orientation on the stability of regular tunnels and cracked tunnels, experiments by using square specimens with a centralized small tunnel were conducted, and the corresponding numerical study as well as photoelastic study were implemented. Two kinds of materials, cement mortar and sandstone, were used to make tunnel models, and three types of tunnel models were studied, i.e. (1) regular tunnel models loaded by different orientation’s principal stresses, (2) tunnel models with various orientation’s radial cracks in the spandrel under compression, and (3) tunnel models with a fixed radial crack loaded by various orientation’s principal stresses. In the numerical study, the stress intensity factors of the radial cracks were calculated, and the results agree well with the test results. For regular tunnels, when the angle θ between the major principal stress and the tunnel symmetrical axis is 45°, the corresponding tunnel is the most unfavorable; for tunnels with a radial crack in the spandrel, when the angle β between the crack and the tunnel wall is 135°, the corresponding tunnel is the most unfavorable; for tunnels with a β =130° radial crack, when θ =0° or θ =70°, the compressive strengths of the tunnel models are comparatively low, whereas when θ =90°, it is the highest.
The effect of principal stress orientation on tunnel stability
Highlights Regular tunnels and cracked tunnels under compressions have been studied. Cement mortar and sandstone were used to make tunnel models, and compression tests were conducted. ABAQUS code was applied in the calculation of crack tip stress intensity factor. Photoelastic experiments were implemented.
Abstract In order to investigate the effect of principal stress orientation on the stability of regular tunnels and cracked tunnels, experiments by using square specimens with a centralized small tunnel were conducted, and the corresponding numerical study as well as photoelastic study were implemented. Two kinds of materials, cement mortar and sandstone, were used to make tunnel models, and three types of tunnel models were studied, i.e. (1) regular tunnel models loaded by different orientation’s principal stresses, (2) tunnel models with various orientation’s radial cracks in the spandrel under compression, and (3) tunnel models with a fixed radial crack loaded by various orientation’s principal stresses. In the numerical study, the stress intensity factors of the radial cracks were calculated, and the results agree well with the test results. For regular tunnels, when the angle θ between the major principal stress and the tunnel symmetrical axis is 45°, the corresponding tunnel is the most unfavorable; for tunnels with a radial crack in the spandrel, when the angle β between the crack and the tunnel wall is 135°, the corresponding tunnel is the most unfavorable; for tunnels with a β =130° radial crack, when θ =0° or θ =70°, the compressive strengths of the tunnel models are comparatively low, whereas when θ =90°, it is the highest.
The effect of principal stress orientation on tunnel stability
Zhu, Zheming (author) / Li, Yuanxin (author) / Xie, Jun (author) / Liu, Bang (author)
Tunnelling and Underground Space Technology ; 49 ; 279-286
2015-05-04
8 pages
Article (Journal)
Electronic Resource
English
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