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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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Title: Analysis of natural rock slope deformations under temperature variation : A case from a cool temperate region in Japan
Authors: Mufundirwa, Azania Browse this author
Fujii, Yoshiaki Browse this author
Kodama, Nariaki Browse this author
Kodama, Jun-ichi Browse this author
Keywords: Natural rock slope
Finite element (FE)
Issue Date: Mar-2011
Publisher: Elsevier
Journal Title: Cold Regions Science and Technology
Volume: 65
Issue: 3
Start Page: 488
End Page: 500
Publisher DOI: 10.1016/j.coldregions.2010.11.003
Abstract: 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.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 藤井 義明

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