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Development and Application of Potentially Important Jute Geotextiles (CFC/IJSG/21) Field Trial Application of JGT for Hill Slope Management. National Seminar at Kolkata on 19.09.2013. By Dr . G.P . Juyal Principal Scientist & Head (H&E). - PowerPoint PPT Presentation
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OBJECTIVES
Identification of suitable jute geotextiles (JGT) material and
application technology for hill slope protection in different
agro-climatic situations in India.
Identification of suitable vegetative species and their
performance under JGT application.
Assessment of JGT application on soil loss and runoff
through simulated laboratory studies (runoff
plots/hydraulic flume)
Duration : 3 years
Year of start : 2010
Sites selected for JGT application at 3 locations
representing different hill eco-systems in India viz;
Western Himalaya (Dehradun HQ)
Shivalik hills (Chandigarh Centre of Institute)
Nilgiris hills (Ooty Centre of Institute)
Technical details of sites worked out.
Three types of JGT i.e. 500, 600 & 700 GSM applied at site
by Dehradun, Chandigarh and Udhagamandalam Centres.
PROGRESS OF WORK
Sl.No.
Particulars Dehradun Chandigarh Ooty
1. Location Chakrata hill, Uttarakhand Phedulani – Aara PMGSY road (Ashti bend) – about 100 km from Dehradun
Punjab Shivalik Range – Ropar – Noorpur bedi road, (a) 6 km from Ropar (b) 1 km away towards Noorpur bedi.
a)Research Farm, Ooty b) Keraihada site c) Ketty site
2. Slope steepness 35 (70%) a) > 100% b) 20-30%
a) 16-20% b) 25-30% c) 35-40%
3. Nature of slope material
Coarse sand - 49% Fine sand - 23.4% Clay - 15.2% Silt - 12.4%
Coarse sand - 76% Fine sand - 16% Clay - 4% Silt - 4%
Res. Farm Site Coarse sand - 30.3% Fine sand - 19.5% Clay - 37.5% Silt - 7.5%
4. Whether in seismic zone
Yes (High seismic zone IV)
Yes No
5. Soil texture Gravelly sandy loam Sandy clay, sandy loam Clay loam 6. Geological
features Fragile geology Lithologically fragile Stable
7. Frequency of landslips
Frequent during monsoon Frequent during heavy rains Occasional during heavy rains
8. Annual rainfall 1400 mm (1200-1600 mm) 656 mm (600-900 mm) 1200 mm (767-2017 mm)
9. Temperatue (Max-Min.)
34 -1 38.5 -6.4 19.3 -8.4
SALIENT INFORMATION ON SELECTED SITES FOR JGT APPLICATION
Installation of JGT at Ashti
site, Chakrata Hills,
Uttarakhand,
N-W Himalaya, executed by
CSWCRTI, Dehradun
January 4th, 2012
A close view of the untreated site Geojute bundles being transported to site
JGT laid on ground (04.01.2012) Wooden pegs used for anchoring JGT
JGT secured by constructing a trench on
upper side
Inspection of the JGT layout by experts of
CSWCRTI & NJB (04.01.2012)
PERFORMANCE OF JGT
Performance of JGT after 6 months (July 2012)
Vegetation in the JGT area (after one year)
Survey of vegetation in JGT area
Geojute material Frequency Density700 GSM -Site I 700 15.6600 GSM - Site II 580 14.0500 GSM - Site III 820 14.8Control 240 6.0
Frequency and density of herbs, shrubs and grasses at sites treated with different geojute materials and control
Performance of JGT after 1 /2 years (17.07.2013 )
Grasses & shurbs coming in geojute area
Area is freely grazed by goats
JGT reinforced staggered retaining walls (on downward side) performing well in
retaining debris
AFTER ONE & HALF YEARS
A general view showing JGT application for hill slope management and JGT
reinforced retaining walls below
Performance of JGT in degraded hill slopes (July 2013, see gravels
below)
JGT reinforced retaining wall for debris retention and slope stabilization (A close view)