Today, Japan has more than 10, 000 road or railway tunnels with a total length of more than 4, 500km, as a result of vigorous infrastructure developments. With some of old ones constructed before World War II being still in service, tunnel maintenance has become a crucial issue. This paper deals with deformations as lining cracks, ground heaving and cross-section shrinkage, discussing the reinforcement strategy to deal with any deformation caused by the plasticization of rock mass around tunnel. There have been studies on rock deformation behavior over time, through various approaches using the creep model, but there is only a few that consider the time behavior of rock mass in the actual reinforcement strategy. The applicability of various analytical methods is also yet to be fully examined. The reason for this is that the initial design of tunnels is not based on detailed geological survey or highly accurate analysis, but depends on flexible design modifications during the actual construction work to achieve rationalization. Therefore, only limited geological information is available at the maintenance stage, and furthermore, it is sometimes the case that an old tunnel hardly has any geological information obtained at the construction stage. Another factor that makes the design of a deformation remedial measure difficult is the fact that it requires more information including the initial settings and input physical property values to be used for the modeling of rock mass. Aiming to evaluate the actual deformation behavior of tunnels suffering from long-term rock mass deformation with limited information, this paper examines the analytical method that considers the strength degradation of rock mass around tunnel (hereinafter called “the rock mass degradation model”). Also, in order to design the deformation remedial measure in consideration of the time degradation of the rock mass strength, the measurements and analytical results were combined to introduce the notion of time to the prediction of deformation progress. / Kyoto University (京都大学) / 0048 / 新制・課程博士 / 博士(工学) / 甲第13773号 / 工博第2877号 / 新制||工||1425(附属図書館) / 25989 / UT51-2008-C689 / 京都大学大学院工学研究科社会基盤工学専攻 / (主査)教授 朝倉 俊弘, 教授 田村 武, 教授 木村 亮 / 学位規則第4条第1項該当
| Identifer | oai:union.ndltd.org:kyoto-u.ac.jp/oai:repository.kulib.kyoto-u.ac.jp:2433/57244 |
| Date | 24 March 2008 |
| Creators | 松長, 剛 |
| Contributors | 朝倉, 俊弘, 田村, 武, 木村, 亮, Matsunaga, Takeshi, マツナガ, タケシ |
| Publisher | 京都大学 (Kyoto University), Kyoto University |
| Source Sets | Kyoto University |
| Language | Japanese |
| Detected Language | English |
| Type | DFAM, Thesis or Dissertation |
| Format | application/pdf |
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