Landslide stability assessment along Panchkula–Morni road, Nahan salient, NW Himalaya, India

Abstract

We report the slope stability analysis of three vulnerable sites (S1, S2 and S3) within the lower Siwalik along the Panchkula-Morni road section in the Nahan salient, northwestern Himalaya. Kinematic analysis of joint data was conducted to understand the different modes of failure. Rock mass classification techniques like rock mass rating, slope mass rating (SMR) and continuous SMR were used for stability classification and the factor of safety was calculated using stability charts. At site S1, the instability is controlled by the orientation of the discontinuity joint J1 which is parallel to the bedding and at site S2, the slope fails due to the wedge. The Umri landslide site S3 is the product of a damage zone by the normal faults which intersect at joint J3; a wedge is formed which falls in the critical zone. The damage zone in the Umri landslide greatly affects the porosity and permeability of the rockmass and acts as a pathway for the percolation of water during rainfall which reduces effective stress. The slope failures are tectonically controlled results due to the high slope angles, structural discontinuities like joints and faults and structural damage zones associated with the faults.

Qualifying the geotechnical and hydrological characteristic of the Bandawaya stream valley - Northern Iraq

“…All these systems estimate the rock mass quality quantitatively and estimate the sufficient support of rock mass (Palmstrom, 2009). For various engineering projects, rock mass classification systems have been used to understand the conditions and determine the rock mass quality (Singh & Thakur, 2019). The general classification of the site is good: Q = 35.8, RMR = 69.3, GSI = 71.4, and RMi = 7.3 (Table 1), which means a high value of rock mass compressive strength (σ cm ).…”

Landslide Survey at Cam Mountain (An Giang, Vietnam) by Seismic Refraction and GPR Methods

“…The procedure to perform field data collection for the seismic refraction method is carried out by: 1 -setting up each 115 m long gauge leg, according to the default configuration of the measuring and recording device along the topographic surface, including 24 geophones, every 6 m apart; 2 -for each of metre was arranging five wave points, including one wave point in the middle of the measuring stage, two wave points located nearly second measuring stage, two geophone tip (first and 24, on distance respectively 2.5 m and 60 m) and two points for near waves and two points for far waves [29]. After completing the first measurement section, the work was continued on the next (second) measurement section, in which the 24th (final) Geophone of the first stage was the first Geophone of the second section.…”

Coastal rocky slopes instability analysis and landslide frequency-area distribution alongside the road network in west Mediterranean context (Northern of Morocco)

“…Rock mass classi cation systems are used for various engineering design and stability analyses (J. Singh & Thakur, 2019). The classi cation system considers several factors affecting the stability of the rocks.…”

“…Therefore, the RMR value to estimate the quality of the rock mass and then the average value of the SMR index computed for the different discontinuity sets has been considered to be the most representative value of rock-slope failure evaluation (Irigaray et al, 2003;Siddique et al, 2015; J. Singh & Thakur, 2019). In fact, it allows to study both the slope parameters (nature of the rock, fracture rate, fracture conditions, state of alteration...) and the slope-failure relationship (dip, parallelism ...).…”