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List of products by author: A. Kusaka
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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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A Study on Optimization of Re-construction of Inverted-arch While Keeping Traffic Lane Based on Actual Test in...
Abstract: In Japan, there are some cases of re-construction of inverted-arch because heaving has been continuing after the passing of many years and the secure of road user is lost. In these cases, it isn’t permitted to block road and one traffic lane must be kept. Therefore, factors of inefficiency are earth-retaining wall for securing one traffic lane and conversion of water drainage. So we introduce...
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An Evaluation on Load-Bearing Capacity of Rock Tunnel Lining against Earthquake-attributed Loading
Abstract: Huge earthquakes can pose serious risks even for rock tunnels, as evidenced by large earthquakes in the past. In a large earthquake in Japan in 2004, some tunnels suffered severe damages including collapse of their permanent lining, even though the tunnels were constructed in ordinary ground conditions. To mitigate such risks, mechanical behavior of tunnel lining during earthquake should be...
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Deformation mechanism and effect of countermeasure for tunnel under swelling rock condition
Abstract: Temporary support of tunnel is generally constructed conforming to ground condition on the result of observation and measurement during construction, and permanent lining is constructed after the judgment of convergence of displacement. Deformation and defect during service stage is grasped by periodical inspection, and some countermeasures are performed if necessary. Then, cracks over lining...
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Influence of stiffness of back-fill grouting material for void above tunnel lining upon load-bearing capacity of...
Abstract: Void above a tunnel lining is harmful to a tunnel structure in some cases especially in poor ground conditions. The void often exists in old tunnels constructed with the steel rib and lagging method, and back-fill grouting is one of the most effective countermeasures against the void. Stiffness of the back-fill grouting material is an important factor and should be examined appropriately to...
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Mechanical Behavior of Mountain Tunnel during Earthquake Based on Dynamic Measurement in an Actual Tunnel
Abstract: Rock tunnels suffered severe damage from recent large earthquakes in Japan, despite the empirical knowledge that tunnels tolerate earthquakes better than surface structures. Seismic design for rock tunnels have therefore become a fascinating subject for many tunnel engineers. However, even basic behavior of tunnel has not been fully understood due to lack of actual seismic data. In this study,...
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Waterproof Rock Tunnels for the Preservation of Hydrological Environment
Abstract: Waterproof rock tunnels have been constructed in Japan when it was necessary to reduce the impact on the hydrological environment. This study performed case analyses of existing waterproof rock tunnels in Japan and seepage analysis on the hydrological behaviour related to the waterproof rock tunnels to discuss the practicability of design and construction. The results of the case analyses show...
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