Slope Stability Analysis Based on Rock Mass Rating, Geological Strength Index and Kinematic Analysis in Vindhyan Rock Formation

Abstract

The Rock Mass Rating (RMR), Geological Strength Index (GSI) and kinematic analysis are widely employed in geotechnical engineering practice. The RMR and GSI both are used for rock mass characterization while the kinematic analysis is applied to identify the mode of failure of slope based on rock discontinuities and slope face characteristics of rock. An attempt has been made to analyze the RMR, GSI and Kinematic Analysis using in-situ data corresponding to Vindhyan sandstone. The data has been collected from outcrops at seven different locations in and around Markundi hill along SH-5, Chopan, Sonbhadra. The relationship between RMR and GSI for Vindhyan sandstone in the study area has been attempted using generalize equation proposed by Hoek (2013) while the kinematic analysis has been applied to decipher the weak zone of failure using RocScience Dips software. The lowest RMR value estimated is 35 for location S-4 and the highest RMR value is 58 for location S-1. Other locations viz, S-2, S-3, S-5, S-6 and S-7 have the RMR value from 42 to 49 which infers that the Vindhyan sandstone existing at Markundi is characterized by both poor as well as fair rock mass. The GSI value of the location S-1 is estimated as 34 (minimum) and 46 (maximum) of location S-4. GSI value of the same rock formation also corroborates that the rock mass belongs to poor as well as fair rock mass. The wedge failure is inferred due to intersection of two sets of joints oriented in north-west and north-east direction. The line of intersections of these two discontinuities are observed in wedge shaped block. It is concluded that the locations under investigations have tendency of wedge failure.

Slope Stability Evaluation based on Empirical Methods and it’s Potential Remedy at Lesser Himalayan Zone (A Case Study of Bhalam-Hill Slope, Kaski)

“…RMR and GSI in combination are the best empirical methods for analysis of rock mass stability along with SMR and FOS to study slope stability. In previous study of landslide at 'Application of Slope Mass Rating System In Slope Stability Class Evaluation' (Rasyikin et al, 2019),'Slope Stability Analysis Based on Rock Mass Rating, Geological Strength Index and Kinematic Analysis in Vindhyan Rock Formation ' (Kumar et al, 2021) quite similar result had been obtain regarding to slope stability. The calculated value of R 2 obtained is 0.5485(Figure 3) in the study related to RMRb and GSI and FOS=0.937 and 0.569 which are less than one on the basis of ground water and elevation at two different location of the study area had shown more reliability of the study.…”

Substantiating the optimal type of mine working fastening based on mathematical modeling of the stress condition of underground structures

“…The data obtained in the RS2 software are similar to the natural processes occurring in the conditions of the mineral deposit development. The software package has been widely used at many fields, since it allows taking into account such factors as the physical and mechanical properties of rocks and fractures, the presence of water, stress condition, parameters of mine workings, types of support, the influence of fixed loads, expected displacements, and so on [16].…”

Wedge Slope Failure of Natural Sedimentary Rock Formation Based on Weathering Potential

“…Generally, the study method uses laboratory and field data to determine physical and mechanical properties as a common work for sliding potential assessment [10][11][12][13]. The physical and mechanical properties in determining rock classification and shear strength parameters, such as weight volume (γ), porosity (n), elastic modulus (E), cohesion (c), internal shear angle (ϕ), etc.…”