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Singh, M. M.
- Growth Behaviour of Two-centuries Old Crop Deodar (Cedrus deodara Loudon)
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Indian Forester, Vol 92, No 6 (1966), Pagination: 347-353Abstract
The analysis of crop data from two-century old active sample plots for Cedrus deodara laid out in 1932 when the crop was 165 years old is given in this note. The results are interesting in so far as there is no conspicuous dectine in growth rate even at the advancing age. Perhaps a question may arise if the rotation period for the species in such localities could be raised but full consideration has to be given, inter alia, to the quality of timber produced at this age and the logging damages to natural regeneration usually met with on exploitation of such large trees.
- Production of Mechanical Pulps from Stetrculiaalata and Cassia siamea
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Indian Forester, Vol 92, No 8 (1966), Pagination: 523-528Abstract
no abstract- Nails - Mirrors of Body
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1 Affiliation not given, IN
2 Department of Medicine, S.N. Medical College, Agra, IN
1 Affiliation not given, IN
2 Department of Medicine, S.N. Medical College, Agra, IN
Source
The Indian Practitioner, Vol 26, No 1 (1973), Pagination: 67-69Abstract
Abstract not Given.Keywords
No Keywords given- Blasting Technique for Stabilizing Accident-Prone Slope for Sustainable Railway Route
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Affiliations
1 CSIR-Central Institute of Mining and Fuel Research, Barwa Road, Dhanbad 826 015, IN
2 Indian Institute of Technology (Indian School of Mines), Dhanbad 826 004, IN
1 CSIR-Central Institute of Mining and Fuel Research, Barwa Road, Dhanbad 826 015, IN
2 Indian Institute of Technology (Indian School of Mines), Dhanbad 826 004, IN
Source
Current Science, Vol 118, No 6 (2020), Pagination: 901-909Abstract
Konkan Railway has many unstable slopes along the 741 km long route from Roha to Thokur in the states of Maharashtra, Goa and Karnataka in India. Frequent cases of boulder fall, slope failure and landslide used to occur on the track during the rainy season. Such cases have resulted in several severe train accidents, traffic interruptions, loss of lives and assets. Hence the Konkan Railway Corporation deployed several geotechnical measures such as wire-netting, retaining wall, rock bolting and shotcreting for stability enhancement. However, none of these measures proved effective and accidents continued. Finally, the Konkan Railway Corporation decided to redesign the cut-slopes using blasting. Excavation of hard rock for its removal without damaging the existing track (2– 3 m away from the slope) and disrupting the traffic, was a daunting task. An unplanned blast would have resulted in the closure of the route for hours. The present study explains the method in which entire cutting was redesigned by formation of 5 to 2 m wide berms at an interval of 6 m bench height from rail track level using novel direction controlled blasting technique. Further, stability of the cut-slope, before and after exacavation, has been determined using kinematic analysis and 3D numerical modelling. Similar technique can be adopted to widen or stabilize an active transportation route in hills.Keywords
Blasting, Kinematic Analysis, Numerical Modelling, Railway Track, Slope Rockmass Removal, Stabilization.Full Text
References
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- Specific blasting technique for tunnelling in hot zones
Abstract Views :172 |
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Authors
Affiliations
1 CSIR-Central Institute of Mining and Fuel Research, Barwa Road, Dhanbad 826 001, IN
1 CSIR-Central Institute of Mining and Fuel Research, Barwa Road, Dhanbad 826 001, IN
Source
Current Science, Vol 121, No 9 (2021), Pagination: 1227-1234Abstract
Encountering hot zones while excavating tunnels for hydropower projects in the Himalaya, India, is a challenge for civil engineers. Blasting within the hot rock mass can pose serious threats due to possibility of temperature-induced unintended detonation of explosives. Moreover, the paucity of a suitable rock-blasting method for these hot zones sometimes compels engineers to realign the tunnel. Such a realignment is costly and time-consuming. A temperature of 50–98°C was encountered while excavating the rock mass for head race tunnel of Karchham–Wangtoo Hydro-Electric Project, Himachal Pradesh, India. The Directorate General of Mine Safety, India, suggests that blast-holes with temperature greater than 80°C must not be charged and blasted. Similarly, the use of electric or non-electric detonators is discouraged above 70°C because of premature detonation. Hence excavation works were suspended for tunnel construction. A unique drill and blast method has been adopted for blasting the hot strata in the tunnel. The technique described in this study can be easily followed in similar situations for tunnel-rock excavationKeywords
Excavation sequence, geothermal energy, hot zone, quenching, tunnel blastingFull Text
References
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