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List of products by author: T. Ushida
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Influence of corroded segment joint on strength of shield tunnel
Abstract: There are some cases where shield tunnels are distorted because of the wide-area ground settle-ment caused by consolidation of surrounding soft clayey ground, adjacent construction and others. To properly maintain the shield tunnels, it is desirable to predict the magnitude of distortion and consider the necessity of measures. Corrosion of segment joints caused by chloride attack is observed in...
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Long-term deterioration prediction of cut-and-cover tunnels affected by carbonation or chloride attack based on...
Abstract: In this paper, the parameters for long-term deterioration prediction of subway tunnels in Japan are clarified by the analysis of field data. In Japan, many reinforced concrete structures have been damaged by carbonation or chloride attack, and most of Japanese subway tunnels are built using reinforced concrete. Therefore, it is important to figure out the parameters. The ratio of concrete...
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The situation of the railroad shield tunnel design in the latest Japan
Abstract: In Japan, Tunnel boring machine (TBM) has been used fluently in soft ground at urban area and these tunnels are called “shield tunnel”. Until 1980, the most of all machine was manual excavate type. However, the ground surface settlement was occurred at many sites. As a result, the earth pressure type and slurry type were developed and These are used mainly. Moreover the original design method...
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