ERE - 2008http://dl.lib.uom.lk/handle/123/182882024-03-28T12:43:53Z2024-03-28T12:43:53ZProceedings 3rd Annual Conference on Mining for Sustainable Development - A Multidisciplinary Approach [Pre Text]http://dl.lib.uom.lk/handle/123/183642023-08-08T03:44:58Z2008-05-01T00:00:00ZProceedings 3rd Annual Conference on Mining for Sustainable Development - A Multidisciplinary Approach [Pre Text]
Karunaratne, S
2008-05-01T00:00:00ZDesigning an underground ventilation system and fan selectionWidisinghe, SDSilva, WJMPGSJayakody, JASPKonsal, JRasika, WGPWeIideniya, HSEkanayake, Khttp://dl.lib.uom.lk/handle/123/183632022-10-12T03:14:59Z2008-05-01T00:00:00ZDesigning an underground ventilation system and fan selection
Widisinghe, SD; Silva, WJMPGS; Jayakody, JASP; Konsal, J; Rasika, WGP; WeIideniya, HS; Ekanayake, K
Karunaratne, S
Mixing of stale air with fresh air (short-circuiting of airflows) is a
critical issue in any underground ventilation system. This study was done at Bogala
mines owned by Bogala Graphite Lanka Ltd, where this type of mixing takes place in
certain levels leading to a cyclic movement of stale air. The main objective of the
research project is to design an underground ventilation system and to select fans to
overcome these adverse effects and making ventilation more effective and efficient. As
die mine is of complex nature, two particular levels at 205 and 240 fathoms were
selected for the analysis, where the short circuiting of air is predominant. A detailed
survey was carried out to measure the variations of airflow and frictional pressure drop
along cross cuts, development drives and winzes in selected levels. The corresponding
values of mine air resistance for airways were determined to generate a solution
followed by suitable fan selection. Suggestions were made to improve the present
ventilation system, which will enhance mine air quality increasing health and safety
aspects of underground environment.
2008-05-01T00:00:00ZDevelopment of a methodology for selection of industrial grade-a quarry site for coarser and finer aggregatesMaduranga, HGSSinthuja, SSoundararajan, PKumara, MHCMAmadoru, TWimal, MDAbeysinghe, AMKBhttp://dl.lib.uom.lk/handle/123/183622022-10-12T03:15:03Z2008-05-01T00:00:00ZDevelopment of a methodology for selection of industrial grade-a quarry site for coarser and finer aggregates
Maduranga, HGS; Sinthuja, S; Soundararajan, P; Kumara, MHCM; Amadoru, T; Wimal, MD; Abeysinghe, AMKB
Karunaratne, S
Recent history has revealed that the identification of prospective mineral
resources is essential to sustain mineral based industry to full fill the demand required
in future. Aggregate industry also has the same risk of sustaining due increased
demand and the lack of available sites. Therefore this study assists to identify
prospective sites which can be developed to IML-A grade quarry sites and this develops
a methodology which can be applied to all over the country to recognize such locations.
The applicability of designed methodology is ensured by applying it to Kalutara
District - Dodangoda AGA Division and potential sites are identified. Local authorities
like Geological Survey and Mines Bureau will be able to reserve the potential locations
which will be identified by the study for future development without urbanizing those
areas. This will facilitate establishing new quarries at a lower cost.
2008-05-01T00:00:00ZTunnel design for fractured rocks and suitable support selectionSenthilkumar, MSenadhira, AMADMGiriwaksan, SWelideniya, HSDharmaratne, PGRhttp://dl.lib.uom.lk/handle/123/183612022-10-12T03:15:03Z2008-05-01T00:00:00ZTunnel design for fractured rocks and suitable support selection
Senthilkumar, M; Senadhira, AMADM; Giriwaksan, S; Welideniya, HS; Dharmaratne, PGR
Karunaratne, S
This research focused on design of a tunnel in highly fractured rocks, and to propose suitable support classes, based on the study carried out at the Upper
Kotmale Hydro Power project location. The necessity arises in order to cope up the
unpredictable changes in geological patterns which highly influence the continuity of
tunnel works. Present tunnelling method in fractured rocks need to be further
evaluated to suit the engineering geological patterns and rock types of the area. The
rock strength and the fracture intensity are assessed through field and laboratory
works, including tunnel mapping and joint intensity surveys. The suitable support class
selected based on Q-value system formulated by Nick Barton (Norway) in mid 70's.The
data and the borehole samples obtained from site location facilitated to propose a
proper support design, suitable to Sri Lankan geotechnical conditions. The variation in
the rock mass from unweathered to highly weathered, sound to heavily fractured along
a tunnel was accounted in selecting a suitable supporting method to avoid disastrous
consequences and to provide a secure working environment. The results of the study
were used to develop a model for tunnel design, and to propose modifications to the
existing support classes in fractured rocks at Upper Kotmale Hydro Power Project. And
it was understood Q-value evaluation could be more suitable than RMR, for Sri Lankan
terrain.
2008-05-01T00:00:00Z