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List of products by author: Y. Okazaki
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A Study of the Conditions for the Occurrenceof Icicles in Road Tunnel
Abstract: Icicles may growth on the tunnel lining in winter season. Since icicles can cause traffic obstructions and damage to tunnel facilities, tunnel managers prevent icicle-related damages by the patrolling and manually removing works of icicles on the tunnel lining. Therefore, the patrolling and manually removing works of icicles by tunnel managers are very severe works in winter season. In this...
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A Study on the Effect of Heaving on the Soundness of Tunnel Invert in Mountain Tunnels
Abstract: The heaving phenomenon in mountain tunnels affects the stability of the tunnel. Therefore, if heaving can occur even on hard ground, it is necessary to construct an invert. The tunnel-invert is an important structural component for the long-term stability of the tunnel. However, in mountain tunnels in Japan, the heaving phenomenon may occur even if the invert is constructed at the design stage....
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Average Material Properties of Composite Ground
Abstract: This study discusses the average Young’s modulus arising out of the inhomogeneity and the influ-ence of the arrangements of composite materials in the ground. Numerical analysis of tunnel ex-cavation in inhomogeneous ground which distributed two material properties were carried out. In this study, the ground is composed of two types of Young’s modulus. In addition, the each volume rate of...
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Effects of Spatial Heterogeneity of Geomechanical Properties
Abstract: It is common not to consider the spatial heterogeneity of geomechanical properties when numerical analysis is used in the support design of mountain tunnels. For this reason, tunnel behaviour that greatly exceeds the predictions by numerical analysis may occur at the site. In this study, in order to clarify the effects of the spatial heterogeneity of geomechanical properties in soft rock mass...
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Evaluation of mechanical characteristics of inhomogeneous ground by using back analysis procedure
Abstract: This study discusses the variation of the average modulus of elasticity arising out of the inhomogeneity of ground mass. Numerical analyses of tunnel excavation in the ground with statistically distributed inhomogeneous materials are carried out. The displacements of extensometer measurements during tunnel excavation on numerical simulation were collected. Back...
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