著者

Teruo HIRABAYASHI Yosuke MIYAZAWA Katsuichi OTA Tsuneo YOSHIHARA Hiroyuki HIDA

出版者

The Japan Landslide Society

雑誌

Landslides (ISSN:02852926)

巻号頁・発行日

vol.22, no.3, pp.1-10, 1985-12-25 (Released:2011-07-04)

参考文献数

24

被引用文献数

2 1

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Topography and geology of the midstream area of the Hime valley is fairly complicated, and there are abundant groundwater caused by heavy snowfalls of this area.There can be seen many gently slanting surfaces in the arrea; the writers investigated these gentle slopes topographycally, geologically and genetically.The sloping surfaces are classified into 1) old erosion surface 2) slope caused by landslip of pyroclastics 3) slope caused by Tertiary landslide 4) fluvial terrace and so on Therefore, many of them have some relation to landslide in broad sense.The gentle slopes of Tertiary landslide are concentrated in areas of alternated mudstone and sandstone, and they are closely related to geologic structure. The writers reexamined the genesis of many gentle slopes along the Hime river which have been considered to be fluvial terraces so far. The study on gentle slanting surface in landslide area will be effective for both prediction and counter measure of landslide.

著者

Shoji UENO

出版者

The Japan Landslide Society

雑誌

Landslides (ISSN:02852926)

巻号頁・発行日

vol.36, no.4, pp.32-39, 2000-03-15 (Released:2010-03-16)

参考文献数

11

被引用文献数

2 2

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一般に地すべり地の地下水は複雑に流れている。この地下水の流れを把握するために, 地下水検層法が標準的な方法として普及している。筆者は, 孔内微流速計を用いたボーリング孔内水の上下方向流の流速測定に取り組んできた。そしてこの方法を2箇所の活動的な地すべりで昨年実施した。測定結果は, 孔内水の明瞭な流速結果をとらえており, 各透水層の透水係数や水圧を算定することが出来た。これらの透水性の情報は, 地すべり地の地下水流動機構の解明を容易にした。結論としては, 孔内微流速計は, 地すべり地の地下水調査に有力な機器といえる。

著者

Ishii Yasuo Ota Keiichi Kuraoka Senro Tsunaki Ryosuke

出版者

Springer Verlag

雑誌

Landslides (ISSN:1612510X)

巻号頁・発行日

vol.9, no.3, pp.335-348, 2012-09

被引用文献数

49

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To monitor land deformation in detail, we ran a large-scale field test in which an artificial landslide was induced by the application of a load to a natural slope. The measured landslide displacement was reproduced numerically through the use of finite element model analysis with a two-dimensional elasto-viscoplastic model. The analysis suggested that the strength of the sliding surface decreased as the landslide mass moved. We propose a simple method for estimating safety factors. The method involves back-calculation of shear strength parameters through reproduction of observed landslide displacements and calculating the ratio of driving force to resisting force acting on the sliding surface as modeled by joint elements. This ratio, the “stability index”, shows the same trend as safety factors calculated by a two-dimensional limit equilibrium method and a shear strength reduction method that use back-calculated shear strength parameters estimated from the limit equilibrium state. The results indicate that the stability index may be applicable to the assessment of slope stability.