Stability Analysis of Cut Slopes Using Continuous Slope Mass Rating and Kinematic Analysis in Rudraprayag District, Uttarakhand

Kainthola

Geomatics, Natural Hazards and Risk

2013

The study involves the characterization of rock mass along the right bank of river Sutlej, Luhri, Himachal Pradesh. This road connects to several important locations and therefore blockage due to slope failure may cause several problems. Lack of proper geotechnical/geological investigations has led to cutting of the natural hill slopes with improper design. The subsequent road cut slope has made this zone highly vulnerable and a threat to local commuters. The concerned area has varying lithology which are highly jointed and exposed all along the road cuts. The unrestrained slope in this zone is prone to recurrent failures due to high precipitation and seismicity, eventually causing loss of life and property. Therefore, the study helps in understanding the behaviour and mode of failure of the cut slope through geometrical relationship between structural discontinuities and surface topography. Several important parameters were determined to quantify the region based on available and widely used rockmass characterization techniques to develop a proper understanding. This will ultimately help in designing appropriate remedial measures to such vulnerable zones that will prevent further slope failure and resulting damage.

Section: Slope Mass Ratingmentioning

confidence: 99%

Rock mass assessment along the right bank of river Sutlej, Luhri, Himachal Pradesh, India

Kainthola

Geomatics, Natural Hazards and Risk

2013

“…The failure mechanisms usually instigate and follow preexisting discontinuities rather than breaking through intact rock. The stability problem of rock slopes along roads in the Himalaya is a major concern in most of the places [16]. It has been revealed that in hilly areas, especially in monsoon season, unplanned excavation of rock slopes for road construction and widening makes the slopes most vulnerable.…”

Section: Introductionmentioning

confidence: 99%

Geotechnical Investigation of Slopes along the National Highway (NH-1D) from Kargil to Leh, Jammu and Kashmir (India)

Hussain¹,

Singh²,

Bhat³

2015

The national highways are always considered as the economic backbone of the country and have often assisted development work all along their routes. The National Highway (NH-1D) is the most strategic and the only all weather surface link between the two districts of Ladakh region (Kargil and Leh). The area under investigation experiences high vehicular traffic, particularly between March and August, as in the remaining months the Kargil and Leh districts remain cutoff from each other due to bad weather. In recent years, frequent occurrences of slope failures along the highway primarily affect the smooth functioning of the traffic movement which severely affects the life of the people of the area. Strategically, this road network is very important and plays a significant role in transportation and other activities. In order to ensure the stability of road network in the area, it becomes extremely important to understand the triggering mechanism of these failures. The present study made an attempt in this direction and the Slope Mass Rating (SMR) method has been used for slope stability analysis at different locations. The stability of the slopes was also assessed using kinematic analysis conjointly with SMR to identify the types of failure and its potential failure directions associated with each slope. The result obtained after calculating RMR from the selected facets ranges from 11 to 89 with lower values indicating presence of potentially unstable areas. Results have shown that in a total of 20 facets, 65.28% belong to wedge failure, 22.26% belong to toppling failure and 12.45% belong to plane failure.

“…limit equilibrium method (LEM), finite element method (FEM), finite difference method (FDM) and distinct element method (DEM). The conventional techniques mainly include kinematic analysis and limit equilibrium techniques (Duncan & Wright, 1980;Kim et al 2002;Kumar & Sanoujam 2007;Umrao et al 2011). LEM is the conventional tool which is routinely used in analysis of loose slope soil/debris etc., whereas translational or rotational movements occur on distinct failure (Vishal et al 2010;Singh et al 2013b).…”

Section: Introductionmentioning

confidence: 99%

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

Ahmad

Ansari

Geomatics, Natural Hazards and Risk

2013

Self Cite

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.