Stability analysis and control measures of a debri landslide – a study along national highway of himalayan region
By: Prakasam, C
.
Contributor(s): Aravinth, R.
Publisher: Roorkee Indian Society of Earthquake 2022Edition: Vol.59(1), Mar.Description: 27-45p.Subject(s): Civil EngineeringOnline resources: Click here
In:
ISET Journal of earthquake technologySummary: This study focused on the slope stability evaluation and providing suitable slope stabilization measures
for the Kotropi landslide, that occurred on 13th Aug 2017 along NH 154 of the Padhar Tehsil, Mandi district,
Himachal Pradesh. The landslide mechanism was complex and involved translational and rotational
movement. The length and width of the landslide were 1155 and 190 m, respectively. Five soil samples
were collected using the random sampling method for evaluating slope stability controlling properties such
as direct shear strength, Atterberg limit, and particle size distribution. Soil classification revealed large
quantities of pebbles and fine-grained particles (lean clay and silt). The results from particle size distribution
revealed that soil size ranged from 4.75 to 2 mm and 0.42 to 0.15 μm in diameter and on an average
comprised 44.5% of the soil sample. The 2D limit equilibrium model (LEM) was used for the slope stability
assessment. the Factor of safety (FOS) was estimated to be 0.83, which proved the slope to be unstable even
post-failure. Since the Kotropi landslide is located in the seismic zone IV, stability measures were checked
under the influence of seismic loading in addition to rainfall conditions. Based on the Janbu simplified
method, the FOS of the slopes reduced to 0.72 under the rainfall and seismic loading conditions which is
well below the accepted limit indicating that the slopes are vulnerable post landslides. The proposed
stabilization measure involves benching of slopes and reinforcing them with end anchorage techniques.
Reinforced bench slope with end anchorage techniques have been suggested as the cost effective measure
for post stabilization. A FOS values of 1.2 and 1.0 were achieved for rainfall and rainfall as well as seismic
conditions proving that the proposed stabilization technique made the slope stable under both conditions.
| Item type | Current location | Call number | Status | Date due | Barcode | Item holds |
|---|---|---|---|---|---|---|
Articles Abstract Database
|
School of Engineering & Technology Archieval Section | Not for loan | 2023-0487 |
This study focused on the slope stability evaluation and providing suitable slope stabilization measures
for the Kotropi landslide, that occurred on 13th Aug 2017 along NH 154 of the Padhar Tehsil, Mandi district,
Himachal Pradesh. The landslide mechanism was complex and involved translational and rotational
movement. The length and width of the landslide were 1155 and 190 m, respectively. Five soil samples
were collected using the random sampling method for evaluating slope stability controlling properties such
as direct shear strength, Atterberg limit, and particle size distribution. Soil classification revealed large
quantities of pebbles and fine-grained particles (lean clay and silt). The results from particle size distribution
revealed that soil size ranged from 4.75 to 2 mm and 0.42 to 0.15 μm in diameter and on an average
comprised 44.5% of the soil sample. The 2D limit equilibrium model (LEM) was used for the slope stability
assessment. the Factor of safety (FOS) was estimated to be 0.83, which proved the slope to be unstable even
post-failure. Since the Kotropi landslide is located in the seismic zone IV, stability measures were checked
under the influence of seismic loading in addition to rainfall conditions. Based on the Janbu simplified
method, the FOS of the slopes reduced to 0.72 under the rainfall and seismic loading conditions which is
well below the accepted limit indicating that the slopes are vulnerable post landslides. The proposed
stabilization measure involves benching of slopes and reinforcing them with end anchorage techniques.
Reinforced bench slope with end anchorage techniques have been suggested as the cost effective measure
for post stabilization. A FOS values of 1.2 and 1.0 were achieved for rainfall and rainfall as well as seismic
conditions proving that the proposed stabilization technique made the slope stable under both conditions.
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