Highway Research Record No. 39 - Indian Roads Congress

Significance/ Utilisation potential
Based on laboratory studies, it is concluded that the
copper slag mixed with locally available pond ash by
50 per cent was found suitable as a road construction
material, especially for embankment construction.
Further information/Copy of report can be obtained
from
address: The Head, Geotechnical Engg. Division,
CSIR- Central Road Research Institute, New Delhi -
110025, Mobile: 9868858380, phone: 26832173, Fax:
011-26845943, e-mail ID: vittal.crri@gmail.com
B. CoMpleteD proJeCtS
1. Engineering of Structures against Natural and
Other Disasters
Keywords: Cyclone disaster, Differential global
Positioning System, steel pedestals, lanslides
I.
II.
Date of Start: July 2007
Central Road Research Institute, New Delhi(
R )
Structural Engineering Research Centre (C)
present Status and progress
Status: Continued
Year of Last Report: 2011
Further Findings/ Supporting Data
This project has been taken up as a network project
coordinated by SERC, Chennai. Preparation of
Guidelines for Cyclone prone areas and studies on two
large landslide affected areas were carried out under
this project. Under the second project, two landslides
namely Patalganga and Kaliasaur landslides have
been selected for detailed investigations under this
project.
Work done on Kaliasaur landslide:
1. Base Map Preparation: A total 231.49 Ha area
was covered for the topographical survey with
scale of 1:500. The topographic base map which
was produced with the help of high precision total
station and the DGPS was used to develop a
Digital terrain model and its derivatives maps such
as slope and aspects. The DTM and its derivatives
give opportunity of logical thinking about the
possible influence and activities on the basis of
visual observation on the ground.
ROAD RESEARCH IN INDIA 2011-12 39
2.
3.
Geomorphological Assessment:
Geomorphological studies of the area have been
carried out on the base map of the 1:500 scale.
The morphology of slide has changed regularly
since the slide first appeared. Repeated sliding
of minor magnitude have been occurring from
the main scarp of the slide making the slide
retrogressively moved because the surface of
rupture was extending in the direction opposite the
movement of the displaced material. However, at a
later date the surface of rupture started extending
at the lateral margin as well widening the slide
making it advancing in nature. The cliff, the steep
rupture surface of the top has got enlarged by 40m
since 1984. In 2010 alone it has got enlarged by
20 m during one event of sliding. The cliff between
the crown and displaced material become irregular
because of the numerous gullies. There are many
cracks above the crown part. Below the main scarp
there are a few minor scarp developed, indicating
successive sliding.
Investigating the Role of Geology in Slope
Instability: Detailed geological map of the area
was prepared to find out the role played by
lithology and structures to affect the slope stability.
The independent geology and structural mapping
revealed the fact that structures are formed by
tectonic deformations in past geological times. The
detailed study of major and minor structures was
carried out with an intention of figuring out their role
in inducing instability and causing the slope failures
in the area. In the area of study it has been observed
that contacts between two litho-units (e.g. pink and
white quartzite) are often a fault, i.e. their contact
surface is actually faulted. Prominent foliation of
the area shows that the strata are folded synclinally
and anticlinally. Wedge failure is the most common
mode of failure in highly jointed quartzite rock in
this area.
In a similar manner, Micro-Zonation Analysis Based
on Rock Mass Rating (RMR) and Slope Mass Rating
(SMR), Kinematic Slope Stability Analysis, Microhazard
evaluation has been carried out for this slide.
The landslide activity reactivated during Sep-Oct 2010
and NH 58 had to be closed to traffic and vehicles had to
take a longer detour. CRRI has carried out estimation of
indirect landslide losses due to reactivation of Kaliasaur
landslide using unit cost estimation method.
Detour cost = (Extra operating costs in detouring +
Extra fuel used * Fuel price) * Number of travelers
affected.
The estimation was based on traffic affected due to
detouring due to blockage of National Highway–58.