Fracture zone landslide, its mechanism and remedial measures (A case study of the Kuchisakamoto landslide)

Content Provider	Scilit
Author	Nakamura, H. Karna, A. K. Shiraki, K. Takeda, H.
Copyright Year	2018
Description	Book Name: Landslides and Engineered Slopes. From the Past to the Future
Abstract	The Kuchisakamoto landslide, situated in Shizuoka prefecture, Japan, is a huge rockslide. It lies near the southern Japanese Alps. As the landslide is located near tectonic line and subjected to continuous rainfall in monsoon, it was highly active. During past hundreds of years it has slid more than 50m horizontally. The landslide was designated as a potential landslide area in 1960. However, substantial movement was recorded only after 1988, after which intensive landslide investigation works, followed by enormous landslide prevention activities were carried out. Besides various investigation works groundwater levels at various boring points and pore water pressure are being measured. Present paper clarifies the relationship of the movement of landslide with other parameters, especially, pore water pressure. The analysis was done using seepage analysis software. The factor of safety of landslide was analyzed using the pore-water pressure value and commonly used groundwater level converted to pressure, to compare the two methods.Japan archipelago consists of young mountain chains with many tectonic lines crossing the country at various places. This chapter discusses the Kuchisakamoto landslide situated in the central Japan. It clarifies the relationship of movement of landslide with some parameters, especially pore water pressure. Investigation of landslide consists of understanding the landslide constituting materials and their properties, distribution of landslide rocks, properties and amount of moving soil, which constitute important information for the analysis of factor of safety. Several boring works have been carried out since investigation works began. Groundwater is one of the major factors affecting the landslide. In 1988, ring shear test was performed to evaluate c and φ parameters. In following year, 1989, direct shear test was also performed. The main objective of seepage analysis was to obtain a pore pressure profile similar to that measured at the observation points. The prevention works mainly consists of drainage structures to reduce ground water level and consequently the pore pressure.
Related Links	https://content.taylorfrancis.com/books/download?dac=C2004-0-07813-5&isbn=9780203749197&format=googlePreviewPdf
Ending Page	660
Page Count	6
Starting Page	655
DOI	10.1201/9780203749197-94
Language	English
Publisher	Informa UK Limited
Publisher Date	2018-05-02
Access Restriction	Open
Subject Keyword	Book Name: Landslides and Engineered Slopes. From the Past To the Future Geological Engineering Rainfall Factor of Safety Boring Seepage Analysis Tectonic Line Landslide Investigation
Content Type	Text
Resource Type	Chapter