Abstract
The rock mass has special properties, such as inhomogeneity, anisotropy, discontinuity, and nonelastic, due to various internal or external stress in the process of its formation. In this study, similar materials are considered to simulate the rock mass and analyze the failure law using laboratory tri-axial tests based on the similarity principle. The rock mass and discontinuity are constituted in the process of model construction by considering the influence of the orientation, spacing, and number of discontinuity, respectively. Then, the influences of the orientation, spacing, number of discontinuity, and the combination of different discontinuous strength on rupture mechanism of the rock mass are analyzed by considering lots of numerical test schemes using the discontinuous deformation analysis method. Finally, considering water conveyance tunnel in Jurong Pumped Storage Power Station in China as a test case, the tunnel stability under different discontinuities combination is analyzed using discontinuous deformation analysis method. The influence of the optimal tunnel axis and tunnel shape on the stability of surrounding rock is studied by comparative analysis of surrounding rock stability under different tunnel axis and tunnel shapes. The stress concentration in case of the circular tunnel with corner is somehow less than that of the rectangular one.
Highlights
The strength and deformation properties of rock masses with discontinuities are critical for the design of engineering structures, such as tunnel and slope.[1–6] complicated discontinuity patterns, anisotropic and inhomogeneity in a rock mass make the strength estimation difficult
The failure mechanism of rock mass is evaluated by analyzing the influence of discontinuity combinations on the strength of rock mass in this article
By utilizing the ways of laboratory tests, the failure law and strength of rock mass are analyzed from the perspective of dip angle, spacing, and number of discontinuity
Summary
The strength and deformation properties of rock masses with discontinuities are critical for the design of engineering structures, such as tunnel and slope.[1–6] complicated discontinuity patterns, anisotropic and inhomogeneity in a rock mass make the strength estimation difficult. The laboratorial tests failed to simulate the deformation and failure of rock samples with several sets of discontinuities with different dip angles due to limitation of sample size.
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