Instability investigations of basaltic soil slopes along SH-72, Maharashtra, India

Abstract

Mahabaleshwar is one of the most attractive and important destinations for tourists in Maharashtra, India, which experiences frequent slope failure due to highintensity rain and complex geological conditions. The litho unit of the area is the Deccan Trap Basalt, the most famous consecutive basaltic flows during the late Cretaceous to Tertiary periods. The area is very susceptible to weathering, different degrees of alteration, formation of soils and occurrences of bole beds in between two consecutive basaltic flows. Soil formation process in this area is one of the most influencing factors for slope failure; in addition to this, joints, subvertical-to-vertical slopes, heavy rainfalls, etc. also play a pivotal role in instability. These transformed soils create instability on the slopes and ultimately converge to slope failures. Five types of soils have been identified during field investigations, petrographic study and X-ray diffraction that indicate change in composition and colour variations. Geomechanical properties viz. bulk density, grain size analysis, Atterberg limit, uniaxial compressive strength, cohesion and angle of internal friction were calculated for five types of soil samples. Effects of these soils on slope stability have been depicted with the help of numerical program Slide 6.0 based on limit equilibrium method.

Hazard assessment of rainfall-induced landslides: a case study of San Vicente volcano in central El Salvador

“…The method utilized for the LEM analysis was the Bishop simplified method. This method is commonly used in 2D slope stability analyses and is typically found to be conservative for irregular slip surfaces, making it a good choice for this application (Ahmad et al 2013;Singh et al 2013a, b;Hungr et al 1989). The program chooses the failure surface that has the lowest factor of safety (FOS) of all possible surfaces.…”

Landslide hazard zonation mapping and cut slope stability analyses along Yercaud ghat road (Kuppanur–Yercaud) section, Tamil Nadu, India

“…The relationship between the structural discontinuities and slope inclination has greater influence on slope instability. The relationships given in the LHEF scheme are (1) parallelism between the direction of slope and the discontinuity, (2) dip of discontinuity and inclination of slope, (3) dip of discontinuity [61]. The structural ratings for each facet were evaluated from the structural relationships of discontinuities with slope.…”

“…Landslide hazard and susceptibility zonation mapping have been carried out by using various methods and techniques using different scales based on the requirement of the end user and the rationale of the investigation [26]. Different landslide hazards and susceptibility mapping methods described by Mantovani et al [39] include distribution analysis [16,22,78], qualitative analysis [17,41,43], statistical analysis [53,55,67], deterministic analysis [1,6,44,68], landslide frequency analysis [12,32,40,42], and distribution-free methods such as fuzzy logic [34,36,[52][53][54]69] and artificial neural network (ANN) models [13,15,51,80]. Many researchers adopted the Bureau of Indian Standard [BIS 14496 (Part 2): 1998] guidelines to prepare the landslide hazard zonation mapping [5].…”

Diseño de las soluciones de estabilización en el cementerio patrimonial de Guayaquil, Ecuador.

“…Para mitigar estos problemas, la caracterización de ingeniería detallada de los materiales no consolidados es muy esencial [7]. Generalmente, un deslizamiento de tierra se inicia a partir de una combinación de factores como la geometría de la pendiente, la resistencia del material de la pendiente, la condición hidrogeológica, la discontinuidad estructural, la meteorización, el desarrollo de zonas débiles, las perturbaciones litológicas y las fuertes lluvias [8][9][10][11]. Estos factores, en combinación, serán responsables de definir la condición de estabilidad de la pendiente.…”