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Sliding Mechanism of Okimi Landslide and Analysis of Overall Blocks
http://hdl.handle.net/10191/39209
http://hdl.handle.net/10191/39209eef85b9f-4ca0-470e-9c90-c6a7ecd97d37
名前 / ファイル | ライセンス | アクション |
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2016-03-08 | |||||
タイトル | ||||||
タイトル | Sliding Mechanism of Okimi Landslide and Analysis of Overall Blocks | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Sliding Mechanism of Okimi Landslide and Analysis of Overall Blocks | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | landslide | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | investigation | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | prevention | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | residual shear strength | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | stability analysis | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | factor of safety | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | departmental bulletin paper | |||||
著者 |
Tiwari, Binod
× Tiwari, Binod× Marui, Hideaki |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | The adverse effect of landslide to any nations, how advanced is she and her human society, is well understood from the past. However, the proper way for the countermeasure planning is still in the developing stage. There always appear many uncertainties, balanced by large value of factor of safety. In this regard, some geotechnical professionals derived various methods for the stability analysis, ranging from simple Swedish circle method to three dimensional method. These can be utilized to analyze the critical potential slope but can not directly be applied on the landslide area and back analysis method is continuously used since long time ago, in the past. Back analysis is simple method in the absence of soil test data on the sliding surface soil. Testing of the sliding surface soil is rare in these days, as very few drainage wells penetrate the sliding surface. Hence, back analysis method always assumes shear intercept (c), using thumb rule to derive the internal friction angle (Φ).Until now, even the developed countries like Japan are applying the value of c with respect to depth of sliding surface and calculating the value of Φ for whole landslide. The ground water level in the crosssection is also fixed from the monitoring data of very limited number of piezometers. In this condition, ground water position will also be uncertain parameter and should be assessed. In the developing countries, the budget is not sufficient for plenty of check borings and drainage wells are almost impossible. The balance in the stability of the landslide is always tried to maintain by retaining walls, due to the availability of cheap manpower and materials. Especially, in the case of repetitive rotational slides, residual shear strength plays an important role, rather than the peak one. Recent researches show that the residual shear strength is governed by the parallel most orientation of the clay minerals of the soil rather than the position, seepage condition, over consolidation pressure and so on of the soil. This made the analyzer easy to relate the shear strength of main scarp soil with the sliding surface soil, as both should have similar mineral composition. Present research is conducted to find the relationship between the shear strength of sliding surface and the main scarp soil. Okimi landslide, situating in Maki village, Niigata prefecture of Japan is also suffering from the aforesaid problems. The landslide, extending over 70 ha area was first slided more than 100 years ago and is still moving inspite of the heavy countermeasures, applied after the extensive monitoring work since more than 30 years ago. The countermeasures in some blocks, were planned according to the calculations by back analysis method. Due to the lack of drainage wells constructed in recent years, the stability of individual blocks were checked, using tested c and Φ of the main scarp soil. The result shows the lowermost block, bearing the mass of whole upper blocks is unstable. Inspite of heavy counter measures, the upper blocks are found to be moving with the speed of 0.2 to 0.7 m/year, according to the monitoring of the moving posts. This report deals with the analysis of whole landslide, using tested c and Φ. | |||||
書誌情報 |
新潟大学積雪地域災害研究センター研究年報 en : 新潟大学積雪地域災害研究センター研究年報 巻 21, p. 1-21, 発行日 2000-03 |
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出版者 | ||||||
出版者 | 新潟大学積雪地域災害研究センター | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 03877892 | |||||
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収録物識別子タイプ | NCID | |||||
収録物識別子 | AN00183327 | |||||
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値 | publisher |