Effect of bedding angle on tunnel slate failure behavior under indirect tension
Han Wang,Fuqiang Ren,Yuan Chang +2 more
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In this article, five groups of slate specimens with different bedding angles (β, angle between bedding plane and vertical angle) were used to provide guidance for Muzhailin tunnel design and construction.Abstract:
In order to provide guidance for Muzhailin tunnel design and construction, in this study, five groups of slate specimens with different bedding angles (β, angle between bedding plane and vertical a...read more
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Performance of a deep excavation in Lanzhou strong permeable sandy gravel strata
TL;DR: In this article, the authors used a bottom-up method with a top-down method using a peripheral cut-off wall for anti-seepage treatment, the underground diaphragm wall and the concrete bracing had a large rigidity, good impermeability and little influence on the surrounding environment in the process of dewatering and excavation.
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Stability Evaluation Method and Support Structure Optimization of Weak and Fractured Slate Tunnel
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Thermal Conductivity Characteristics of Thermal Insulation Materials Immersed in Water for Cold-Region Tunnels
TL;DR: In this article, the distribution of pore water on the basis of the measured mass moisture content after soaking the tunnel insulation material was investigated, and the authors also analyzed the influence on the thermal conductivity of the material.
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Bedding Plane Effects on Mechanical Behavior of Surrounding Rock in Mountain Tunneling
TL;DR: In this paper, a series of uniaxial compression tests and variable angle shear tests were carried out, and the aim was to investigate the effect of the bedding on its mechanical parameters and failure modes.
References
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Crack classification in concrete based on acoustic emission
Kentaro Ohno,Masayasu Ohtsu +1 more
TL;DR: In this article, two crack classification methods are compared and discussed from results of three types of concrete failure tests, and it is shown that the ratios of the shear crack which are identified by Green's functions for moment tensor analysis are good agreement with those by parameter analysis in the case that the proportion of the RA value and the average frequency is set to 1-200.
Journal ArticleDOI
Rock burst process of limestone and its acoustic emission characteristics under true-triaxial unloading conditions
Manchao He,J.L. Miao,J.L. Feng +2 more
TL;DR: In this paper, a single-face dynamic unloading tests under true-triaxial condition were carried out for Paleozonic marine sedimentation limestone samples produced by blocks cored from 1140m depth in Jiahe coal mine of China.
Journal ArticleDOI
Determination of deformability and tensile strength of anisotropic rock using Brazilian tests
TL;DR: In this article, a computer program based on the complex variable function method and the generalized reduced gradient method was developed to determine the elastic constants of idealized linearly elastic, homogeneous, transversely isotropic media from the strains measured at the center of discs subjected to diametric loading.
Journal ArticleDOI
Borehole stability analysis accounting for anisotropies in drilling to weak bedding planes
TL;DR: In this article, a new model was proposed to calculate borehole failures and minimum mud weight along borehole trajectories with various drilling orientations versus bedding directions, and a new correlation was developed to allow for predicting uniaxial compressive strengths in weak rocks from sonic velocities.
Journal ArticleDOI
The controlled failure of rock discs and rings loaded in diametral compression
J.A. Hudson,E.T. Brown,F. Rummel +2 more
TL;DR: In this paper, a closed-loop servo-controlled testing machine was used to determine if failure initiated in the zone of tensile stress, and failure initiated at the loading points for flat steel platen loading and at the boundary of the hole on the loaded diameter.