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List of products by author: S. Morimoto
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A Current State of Defects due to Material Degradation on Road Tunnels in Japan
Abstract: For road tunnels in Japan, the New Austrian Tunneling Method (NATM) was introduced in 1989 as a technical standard. Since then, defects on permanent lining due to external force have considerably decreased in newly-constructed tunnels. However, flaking and cracks due to material degradation are still common defects, while new-devised techniques in order to improve quality of permanent lining...
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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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Health monitoring and maintenance priority assessment for tunnel lining by using Tunnel lining Crack Index(TCI)
Abstract: The maintenance methodology for road tunnel especially over 50 years old become serious issue by a ceiling collapse accident in Sasago highway tunnel occurred in 2012. Following this accident, MLIT (Ministry of Land, Infrastructure, Transportation and Tourism JAPAN) required all administrator the periodic inspections for tunnel lining of road tunnel. A health monitoring for tunnel lining is...
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Long-term durability of permanent lining concrete in mountain tunnel
Abstract: Up-close visual inspections have been mandatory and hammering tests were done as necessary in periodical inspections for all road tunnels in Japan from 2014. Information obtained by the inspections should be accurately evaluated in order to diagnose soundness of the tunnels and take proper countermeasures correctly. Defect and deformation mechanisms of the permanent lining of mountain...
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Performance of rock bolt with differe nt material by on-site and model experiments
Abstract: Although the tensile and shear resistance performances of rock bolts have been extensively studied, other performance measures such as compression and erosion resistance are required to be examined. Various types of rock bolts have been developed recently; however, owing to the lack of experience in tunneling and data on the use of support members in design and construction, it is difficult to...
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