Static and dynamic analysis of a landslide

Abstract

Slope failure is a recurrent phenomenon in hilly regions. It is hazardous because of the accompanying rapid mass movement of soil and rock mass. To alleviate the damage caused by landslide, slope-stability analyses and stabilization techniques require in-depth understanding and appraisal of the process that govern the failure behaviour of slopes. Once the instability behaviour is understood, remedial measures such as retaining walls, rock bolts, anchoring, etc., can be recommended to stabilize the slope.This article deals with a comparative study used for the analysis of the stability of slopes of Amiyan area, near Kathgodam, Nainital, Uttarakhand assuming that the rock mass follow the Mohr-Coulomb failure criterion under static and dynamic loading conditions. The area constantly experiences local as well as regional slides along the river bank. A field study was carried out in the landslide area to collect the representative samples to determine the various physiomechanical properties of rock as well as debris samples. These properties have been used as input parameters after converting it into the rockmass properties using a joint weakening coefficient for the numerical simulation. The computed deformations and the stress distributions, along the failure surface, have been compared with the field measurements/observation and found to be in good agreement. The global factor of safety (FOS) calculated by finite difference, finite element and dynamic analysis was found to be 1.57, 1.144 and 0.84, respectively. This indicates that the slope is critically stable in case of any small local/global disturbance which may further reduce the FOS and cause failure.

Suitability of Widely Followed Earthquake Early Warning Systems to Seismically Active Regions of India, by Considering Destructive Intensity as a Parameter

“…These include EQ events in 844, 1100, 1255, 1344, 1408, 1505, 1555, 1678, 1747, 1833, 1897, 1905, 1934 and 1950. The collision had also triggered landslides at numerous locations [25]. Compared to the other parts of the country, the seismic activity of the Himalayas is much more alarming.…”

A study on the fractal characteristics of displacement time-series during the evolution of landslides

“…The stability evaluation of landslide can be classified into two categories. From the perspective of mechanism, the landslide hazard is estimated with the application of limit equilibrium method or finite element method (Singh et al 2010;Sarkar et al 2013). Besides, the uncertainty of landslide can also be studied through mechanical analysis (Singh et al 2013).…”

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

“…Previously, researchers have analysed the rock slope around this region along the left bank of river Sutlej based on soft computing and numerical methods Sarkar et al 2009). Singh et al (2010) have assessed the influence of static and seismic loading on a section of highly vulnerable cut slope in the outer part of the Kumaun Himalaya. Several studies related to slope stability have been conducted in Indian Himalaya by different researchers and the general outcome of the research suggests that the concentration of recent landslides can be attributed to the neo-tectonic activities in the vicinity of faults and boundary thrusts (Bartarya & Valdiya 1989;Valdiya 1995;Singh et al 2010).…”

“…Singh et al (2010) have assessed the influence of static and seismic loading on a section of highly vulnerable cut slope in the outer part of the Kumaun Himalaya. Several studies related to slope stability have been conducted in Indian Himalaya by different researchers and the general outcome of the research suggests that the concentration of recent landslides can be attributed to the neo-tectonic activities in the vicinity of faults and boundary thrusts (Bartarya & Valdiya 1989;Valdiya 1995;Singh et al 2010). Stability analysis requires detailed rockmass classification in this region, and therefore this study makes use of the various classification techniques available for the characterization of rockmass along the right bank of river Sutlej, Luhri, Himachal Pradesh.…”