ERE - 2016http://dl.lib.uom.lk/handle/123/182962024-03-29T13:27:17Z2024-03-29T13:27:17ZProceedings of the ERE 2016 Annual Conference on Earth Resources Management [Pre Text]http://dl.lib.uom.lk/handle/123/184912022-11-02T09:15:08Z2016-07-01T00:00:00ZProceedings of the ERE 2016 Annual Conference on Earth Resources Management [Pre Text]
Hemalal, PVA
2016-07-01T00:00:00ZCritical evaluation of blast- induced structural damage criteria for buildings around metal quarries at Thudugala, KalutharaHettiarachchi, MMPriyasanka, IDPHerath, HMWDMohanaruban, GDharmaratne, PGRHemalal, PVAhttp://dl.lib.uom.lk/handle/123/184902022-11-02T09:33:24Z2016-07-01T00:00:00ZCritical evaluation of blast- induced structural damage criteria for buildings around metal quarries at Thudugala, Kaluthara
Hettiarachchi, MM; Priyasanka, IDP; Herath, HMWD; Mohanaruban, G; Dharmaratne, PGR; Hemalal, PVA
Quarrying can generate a number of on-site and off-site environmental
effects as a result of blasting, excavation, crushing, screening, stockpiling and
transport activities. Blasting is necessary for recovery of ore and production of
aggregates in most underground and open cut mines, as well as in quarries.
However, blasting can cause noise and ground vibration, which can have an impact
upon nearby structures and people living close by. Hence, proper control of blasting
practices is necessary to ensure both the safety of employees and the protection of
the community from adverse effects. In Thudugala, in Kaluthura district, people
those who are living close to quarries are highly subjected to these effects due to
quarry blasting. In these circumstances, it was decided to conduct a research into the
ground vibration impact in the area. Due to complexity of structures ranging from
wattle-and-daub structures which do not have proper foundations to those built
with good foundations, the applicability of single criteria of 5 mm/sec PPV level of
vibration which is currently being used in Sri Lanka is inadequate. It is also noted
that the above vibration criteria has been adopted in Sri Lanka without a proper
theoretical foundation. In this research program, the propagation of cracks due to
the blasting was assessed at the initial stage of the project. At the final stage, the
optimum PPV values will have to be found for different types of structures by
constructing them. In this area soil overburden is less. Therefore most of the
structures have been constructed on rock. When blasting takes place, rock tends to
vibrate and the intensity perceived is very high. Therefore crack propagation is high
in these particular structures. It is also noticed that the cracks have further
developed between the period between pre-blast crack survey and post-blast crack
survey. It is due to large number of un-monitored blasts that have been conducted
during that period. Therefore to solve this problem, it is recommended to carry out
continuous monitoring of blasts.
2016-07-01T00:00:00ZStope productivity improvement through application of cut-and-fill mining method variant at Bogala graphite mines, Sri LankaAbeykoon, AGTBBLanka, KASSOvitigala, IRWijerathna, KSHemalal, PVADharmaratne, PGRhttp://dl.lib.uom.lk/handle/123/184892022-11-02T09:44:07Z2016-07-01T00:00:00ZStope productivity improvement through application of cut-and-fill mining method variant at Bogala graphite mines, Sri Lanka
Abeykoon, AGTBB; Lanka, KASS; Ovitigala, IR; Wijerathna, KS; Hemalal, PVA; Dharmaratne, PGR
Hemalal, PVA
Vein graphite mining is more often carried out by underground mining in
Sri Lanka due to its mode of occurrence. Bogala underground mine is one of the
major graphite mines in the country, where overhand cut-and-fill mining method is
used for the extraction of graphite since the ore bodies are steeply dipping, with
considerable vertical extent and clear and stable ore boundaries. According to the
standard practices at the mine, ectraction is carried out at the stope by blasting of
both rock and graphite vein in the exposed face, followed by hand sorting to collect
graphite. Blasting the host rock and veins are carried out separately. Waste rock
generated is used to fill the lower bench. Simultaneously, stope support is carried
out and the working platform prepared. In this practice one cycle extends for four
shifts and the research was launched with the objective of improving stope
productivity by reducing the cycle time. In the proposed methodology, blasting of
the face (graphite vein and rock) was carried out simultaneously resulting in the
reduction of cycle time to two shifts. Therefore, in the research carried out, with the
proposed alternative stope technique followed by froth flotation relevant
performance indicators or parameters of productivity, cost and safety were
analysed.
2016-07-01T00:00:00ZIdentification of the most suitable locations for rock quarrying to supply aggregate requirements of the Colombo Port City development projectNayanthara, PGNRosairo, KDARPGunawardana, GMSMSanjeewa, WPGDissanayake, DMDOKVijitha, AVPhttp://dl.lib.uom.lk/handle/123/184872022-11-02T09:55:22Z2016-07-01T00:00:00ZIdentification of the most suitable locations for rock quarrying to supply aggregate requirements of the Colombo Port City development project
Nayanthara, PGN; Rosairo, KDARP; Gunawardana, GMSM; Sanjeewa, WPG; Dissanayake, DMDOK; Vijitha, AVP
Hemalal, PVA
‘Colombo Port City Development Project’ aims at reclaiming a minimum
of 269 hectares of waterfront sheltered by Colombo South Harbour Breakwater for
mixed development activities. It has been estimated that a total requirement of
26.6 million m3 of dredged sand and 3.45 million m3 of quarry materials for the
reclamation and construction of coastal structures. The main objective of the present
study is to assess and characterize the capability of identified quarry sites to provide
different categories of rock for the project. The quarry site assessment of eleven
quarries were carried out by incorporating factors such as rock quality parameters,
mineable rock volume, type of rock, jointing or racturing in the rock mass, licence
category, mining, hydrogeological and socio economic aspects. The data were
gathered using numerous sources. Having combined geographic information
systems (GIS) and Multi-Criteria Evaluation (MCE), the present study sought to
locate the most suitable areas for rock quarrying to supply rock materials to Port
City Project. The findings of the research indicate that four quarry sites are most
capable of supplying all categories of rock and rest are more suitable for supplying
rock products below 500 kg. Further findings of the research include suitable
transportation routes and capacities for rock materials, potential adverse impacts on
supplying materials and corresponding mitigatory measures to be adopted.
2016-07-01T00:00:00Z