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6.5 The Result and Discussion
6.5.1 Analysis of Strength Parameters (Shear Stress
and Strength) for 10 Major Landslide Locations
The Mohr envelope is the graphical representation of geo-technical parameters
which indicate the stability condition of different
locations. Cohesion is low
everywhere because of the entrainment of
finer particles from the sub-surface layer
by leaching processes, disintegration and decomposition by physical as well as
chemical processes and obviously by soil saturation. In Tindharia (Fig.
6.2
) and
Lower Paglajhora (Fig.
6.4
) the internal friction is around 19
°
and angle of rupture
is 35
respectively. Mahanadi (Fig.
6.5
) and Gayabari Lower Slope
(Fig.
6.6
) is experiencing the safety factor more than one which indicates slightly
higher shear strength than shear stress. Cohesion of the soil is very low that ranges
between 0.03 and 0.16. Water acts in a number of ways for removal of lateral
support by toe erosion, decrease in shearing resistance, entrainment of
°
16
′
and 35
°
30
′
finer matrix
from the slope material and setting the coarser fraction to move, and increase in
Fig. 6.4 Landslide susceptibility under semi-saturated condition
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