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Analysis of natural rock slope deformations under temperature variation : A case from a cool temperate region in Japan

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タイトル: Analysis of natural rock slope deformations under temperature variation : A case from a cool temperate region in Japan
著者: Mufundirwa, Azania 著作を一覧する
Fujii, Yoshiaki 著作を一覧する
Kodama, Nariaki 著作を一覧する
Kodama, Jun-ichi 著作を一覧する
キーワード: Natural rock slope
Finite element (FE)
発行日: 2011年 3月
出版者: Elsevier
誌名: Cold Regions Science and Technology
巻: 65
号: 3
開始ページ: 488
終了ページ: 500
出版社 DOI: 10.1016/j.coldregions.2010.11.003
抄録: In this paper, natural rock slope deformation across fractures predominantly in a chert rock mass was monitored using six surface fracture displacement sensors, and the deformations arising from thermal stresses were predicted using (5 m × 5 m) two-dimensional (2D) finite element (FE) plane strain analysis coupled with a model for rock mass expansion due to freezing of pore water. A new and simple method to minimize displacement proportional to temperature (due to thermal response of chert rock mass and sensor) was proposed. By applying the method, the corrected displacement, u′, can be well recognized. Under u′, clear rock mass movement, which could be related to fracture growth, was observed. In addition, progressive fracture opening and closure were noted. Results from this study indicate insignificant influences of weather conditions on fracture/rock mass movement. Furthermore, under numerical analysis (FE), in the rock mass model (with 1 m deep fracture), tensile stresses that were large enough to induce fracture growth appeared at the fracture tip when temperature lowered. And in the rock slope model (with 1 m deep fracture), small tensile stresses, which were sufficient to cause fracture growth along the planes of weakness were observed. This research suggests that freezing effects on deformation of chert rock mass are insignificant, and we tentatively suggest that thermal fatigue predominantly caused the permanent fracture deformations.
資料タイプ: article (author version)
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 藤井 義明


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