Journal of the Japan Society of Engineering Geology
Online ISSN : 1884-0973
Print ISSN : 0286-7737
ISSN-L : 0286-7737
Rock Slope Stability of the Cretaceous Izumi Group
Keiji MIYAJIMAMakoto NIITUHideo YUGAMI
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1975 Volume 16 Issue 2 Pages 56-62

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Abstract
The Upper Cretaceous Izumi Group in the vicinity of Naruto Strait, consists mainlyof sandstone and shalealternation and shows the monoclinic geologic structure. Well stratified bedding plane forms a distinct geologicdiscontinuous plane, developing cross joints nearly perpendicular to the bedding plane.
The authors studied both a theoretical simple slope model by TERZAGHI and the actual conditions of manyroad cuts. Stability of stratified Izumi Group depends primarily on the bedding plane orientation with referenceto the slope. Further, slope stability is affected by continuous joints and small faults which is difficult topredict its presence before cutting.
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© Japan Society of Engineering Geology
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