Properties for Initial Design of Tunnels by Natm Using Rock Mass Data-Base System

Sezaki, Mitsuhiro; Ichikawa, Yasuaki; Kawamoto, T.; Ouml,; Aydan, mer

doi:10.2208/jscej.1990.421_125

Cited by 4 publications

(1 citation statement)

References 2 publications

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“…Ikeda [1979] proposed a method to calculate rock mass strength by squaring a crack index, which can be assumed as the ratio of the elastic wave speed of rock mass and the rock material. Sezaki et al [1990] evaluated the Young's modulus, the compressive strength of the rock mass, by conducting a statistical evaluation of the relation between it and various rock materials using a rock mass database. We incorporated the ideas of Ikeda and Sezaki and assumed that the compressive strength (σ c ) and tension strength (σ t ) of a rock mass would fall off simply with a set ratio based on the rock material (σ c , σ t ); we termed the coefficient k the "strength reduction rate," which can be expressed as Eq.…”

Section: Estimate Of Rock Mass Strengthmentioning

confidence: 99%

Use of Discontinuous Deformation Analysis to Evaluate the Dynamic Behavior of Submarine Tsunami-Generating Landslides in the Marmara Sea

Chen

Kaneko²,

Hori³

et al. 2011

Int. J. Comput. Methods

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This study assessed the relevance of numerical modeling with respect to the mechanical properties of specific rock and investigated the applicability of submarine landslide simulation using discontinuous deformation analysis (DDA). To predict the dynamic behavior of submarine landslides, we developed a way to model a jointed rock mass for the evaluation of rock slope instability and an original DDA approach using an energy loss model that incorporates energy loss caused by collision between blocks and seawater resistance as a viscous force. We applied the developed model to estimate the dynamic behavior of actual submarine landslides. The simulations assessed seawater resistance and energy loss due to collision between blocks, reproducing past events and suggesting the behavior of vulnerable slopes. The results demonstrate that the model can clarify the energy loss caused by slope absorbability and seawater resistance, and that the improved DDA is very useful for submarine land analysis.

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Section: Estimate Of Rock Mass Strengthmentioning

confidence: 99%