Search

Landslide is a sudden slide of rock, debris and earth down the slope. Coonoor region is one of the worst affected places subjected to landslides due to the heavy rainfall. Soil moisture content, pore-water pressure, slope angles are some of the factors that paves the way for these landslide events. On prediction of soil moisture content and vibrational movements in the soil by incorporation of sensors can caution the traffic, which can ensure the life safety in prior. This research deals with the development of one such sensor based warning system that can predict the soil failure. Investigation was carried out on the soil samples collected from the area of study to assess the index and engineering properties of the soil. Nine different models of a hill profile was made by varying the wetting depth at 1/4th, half and 3/4th of the profile height to predict the landslide. Finite Element Analysis (FEA) of the models were done in PLAXIS 2D software. The critical surface for the slope was drawn graphically using Bishop Method of slices and the same was checked for its best fit using R2 linear regression analysis. The analysis results conveys that the increment in pore-water pressure leads to a larger deformation and a decrement in Factor of Safety (FOS) for different slope conditions considered. Experimental prototype is made and the sensor fixing position for achieving higher degree of accuracy are arrived based on the displacement contours from the simulated models. These sensors were found to be effective in the prediction of soil failure. [ABSTRACT FROM AUTHOR]

Kotabatu Village, Danau Ranau, South Sumatra is a geothermal prospect area and tourism in South Sumatera. This area is topography with an altitude of 1.964 mdpl and relatively high rainfall with the highest average rainfall of about 3.490 mm/year. It has a slope of about 16ᵒ-35ᵒ (steep), so this area is a potential area for landslides. Therefore, it is necessary to research the thickness of the weathered layer and the model of the slip surface, which is a landslide resisting factor using the 2D resistivity geoelectric method to identify the type of landslide in Kotabatu Village. This research uses the 2D resistivity geoelectric method with a dipole-dipole configuration by mapping to later produce a 2D resistivity pseudosection. Kotabatu Village has three dipole lines. The results obtained in Kotabatu Village have a weathered layer thickness of about 3-22 meters which is interpreted as sand and gravel. In contrast, the slip surface is interpreted as andesite rock with a straight slip surface model with a slip surface slope between 3ᵒ-28ᵒ, so that Kotabatu has a translational landslide type. The research area has no research on the thickness of the weathered layer and the slip surface, which is a landslide, so it is interesting to study the landslide resisting factor to become a reference in improving disaster mitigation efforts in the research area. Suggestions for further research the integration of other geophysical methods, such as MASW Method. [ABSTRACT FROM AUTHOR]

Mount Telagalele is an ancient volcano, one of the eccentric cones of Mount Rogo Jembangan. It is situated in the Karangkobar District, Banjarnegara Regency, Central Java, Indonesia. Mount Telagalele and surrounding area is often subjected to either large or small-scale of mass movements, generally involving a thick volcanic rock and clayey formations. Geologically the area is constructed of plastic, clastic, clayey sedimentary rocks, Miocene aged, namely Merawu Formation and an elastic, brittle, massive volcanic rocks, andesitic to basaltic composition, Pleistocene aged, called Jembangan Formation. Hydrogeologically the study area is flown by Kali Urang (river Urang), which streams to the south towards the Merawu River. The volcanic rocks of Mount Telagalele which has begun to be weathered in general is able to hold and pass meteoric water so that it functioning as an aquifer. There are some springs on the contact between the volcanic rocks and the base rock. The local communities usually use springs and dug wells to get fresh water. However, when groundwater in this volcanic aquifer touches the base rock and making it oversaturated, various problems become to emerge. The clayey formation become to be slippery and muddy, causing the overlying volcanic rocks to slip and transfer. Parts of volcano's body and rock blocks in the study area are able to move slowly but surely over a giant slip plane in the form of orographic fields, southward. Locally, this movement is manifested as mass slides, glides, and creeps, occurring any time. One of the last famous landslides involving apart of Mount Telagalele body happened in December 2014, assassinating 108 people. The movement can be classified into combination of rotational and translational, which then develops to be a flow, therefore it belongs to a complex type, indicating that the mass transfer is triggered by hydrogeology. [ABSTRACT FROM AUTHOR]