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List of products by author: M. Shinji
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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 Criteria for Rehabilitation of Old Mountain Tunnels Considering the Risk on Damages by Big Earthquake
Abstract: Of the road tunnels managed in Japan, the proportion of tunnels over 50 years after construction is currently around 20%, but will increase to over 50% in 20 years. In addition, Japan is an earthquake-prone country, and the risk of earthquake occurrence is high. This suddenly decreases the soundness of any tunnel within the influence zone, and there have been reports of cases of large-scale...
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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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Analytical study on time-dependent behaviour on the stability of tunnel face
Abstract: To construct a tunnel safely and economically with the conventional tunnel construction method, it is most important to ensure the standing time of the tunnel face. One of the authors measured the amount of tunnel face extrusion to understand the displacement behaviour of the weak ground during tunnel construction. The measurement results show that the displacement of the tunnel face has a...
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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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Fundamental study on tunnel excavation analysis with considering groundwater
Abstract: If a large amount of water inflow occurs suddenly during the construction of a mountain tunnel, it may lead to a deterioration of construction performance and collapse of the tunnel face. In addition, it is expected that the ground water inflow will have a significant impact on the living environment of the neighboring residents at the tunnel construction site in the case of a small overburden....
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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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Proposal of Tunnel Excavation Analysis Considering the Effect of the Ground Weight
Abstract: In tunnel excavation, it is important to stabilize the face and to control the settlement of the ground. However, when examining the possibility of the collapse of the face, in numerical analysis, there may be a form in which the ground in front of the face flows into the tunnel due to the weight of the ground and the pushing out phenomenon of the face in the forward region. In some numerical...
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Study on Application of Simple Dust Sensor to Tunnel Construction Site
Abstract: Tunnel Boring Machine (TBM) tunnelling projects in hard and abrasive rock pose different challenges compared with those in soft ground. One of the challenges is the determination of penetration rate of tunnelling and the design of TBM cutter with respect to anticipated ground condition. There is little published information on slurry TBM performance in granitic rock. Two 7.45m dia. slurry TBMs...
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Study on Comparative Analysis of TCI and Crack Classification
Abstract: The civil engineering infrastructures in Japan were constructed intensively between the period of high economic growth. The ageing of these civil engineering structures will require appropriate maintenance to ensure their safety. In particular, various methods have been proposed to evaluate the health of the tunnel-lining of road tunnels. One of them is the Tunnel-lining Crack Index (TCI)...
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Study on the Monitoring Systemof Observing the Shape andReduc ingthe Riskof
Abstract: The development of a monitoring system about the stability of tunnel face is an urgent issue because of the problem of occupational accidents caused by "rock fall" which is a collapse of rock near the tunnel face immediately after excavation. In this study, we challenge to prevent damage caused by rock fall by collecting information on the tunnel face using various sensors and evaluating the...
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