ISERME - 2017

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Browsing ISERME - 2017 by Author "Chaminda, SP"

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    Assessment of seasonal impacts on groundwater quantity and quality in upstream of Malwathu Oya Basin
    Madhushankha, JML; Madhuwan, ARB; Menan, P; Chaminda, SP; Abeysinghe, AMKB; Jayawardena, CL; ; Abeysinghe, AMKB; Dassanayake, ABN; Elakneswaran, Y
    Malwathu Oya Basin which covers 2350km2 located in Anuradhapura district is considerably populated and the safety and the available quantity of water is crucial for the people. Water samples were collected from selected locations during South- West monsoon period, Second Inter monsoon period and North-East monsoon period from September 2016 to March 2017. The samples were analysed for pH, turbidity, conductivity, fluoride, chloride, magnesium and calcium as basic drinking water quality parameters. Only the shallow regolith aquifers are considered for the study. The groundwater quality variation of the area shows a considerable variation from dry season to rainy season in general water quality of the area, and is in acceptable limit for most of the basic parameters. With the seasonal changes Fluoride and Chloride content is higher than permissible limits in some areas.
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    Effect of physical and mineralogical properties of aggregates on strength and durability of asphalt concrete
    Bastion, PGS; Chandrapala, SWTD; Rangana, KHVG; Chaminda, SP; Jayawardena, CL; Premasiri, HMR; Abeysinghe, AMKB; Dassanayake, ABN; Elakneswaran, Y
    Asphalt is a mixture of aggregates, binder and filler. The performance of an asphalt matrix mainly depends on the characteristics of its constituents along with the quality of construction process. As 94-95 percent of the total weight of asphalt matrix consists of aggregates, the performance of the mixture is greatly affected and influenced by the properties of aggregates. In the local asphalt industry, aggregates used to produce asphalt concrete, are tested and approved for the application only by evaluating physical parameters such as LAAV, AIV, and shape tests. In this research, mineralogical properties of aggregates have been systematically analysed along with the respective physical and asphalt properties. Crushed aggregates and lump samples were collected from a number of metal quarries and asphalt plants, representing rock types from three major geological complexes; Wanni, Highland and Vijayan of Sri Lanka. Tests were carried out to evaluate physical and mineralogical properties of aggregate and Marshall stability and flow values of asphalt mixture. The suitability of aggregates for asphalt pavement construction were discussed using the test results. Findings of the research proposes to consider the collective influence of both physical and mineralogical properties of aggregates when selecting competent materials for asphalt concrete manufacture.
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    Fluctuations in groundwater level and corresponding earth resistivity changes
    Chandrasena, RTPIU; Madushanka, GHSP; Amalan, K; Samaradivakara, GVI; Chaminda, SP; Jayawardena, CL; Abeysinghe, AMKB; Dassanayake, ABN; Elakneswaran, Y
    The earth resistivity at a known location was frequently measured, through resistivity sounding. Resistivity of subsurface layers could be influenced by the permeability, porosity, transmissivity, composition etc., where moisture content was the concern of this study. ABEM-Terrameter SAS 1000 instrument was used for surveying and data were interpreted using “IPI2-win” software. A borehole was established to reveal accurate subsurface stratification information and monitor the groundwater level, at the surveying location. Groundwater level was recorded through a datalogger in the borehole, at each 12 hour interval. The precipitation data of the area were obtained from the meteorological department to understand the wet & dry seasonal characteristics. Attempts were made to identify the changes in apperant resistivity data in response to the changing groundwater levels/moisture content and the accuracy of corresponding layer thicknesses, computed through resistivity data.
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    Software assisted bench blast optimization
    Bandara, RMCND; Rajapaksha RMCP; Kavirathne, BB; Samaradivakara, GVI; Chaminda, SP; Hemalal, PVA; Dharmaratne, PGR; Abeysinghe, AMKB; Dassanayake, ABN; Elakneswaran, Y
    Blasting activities in mines and quarries have been placing significant emphasis on the ability to tailor fragmentation to improve downstream process. Achieving the optimum blast design for a particular rock mass type can be an expensive and time consuming procedure. Also in many of these operations, the impact of fines and blast design has been clearly identified. The need to be able to predict the degree of fines from blasting has driven the development of an improved engineering model. Over the past few years, many countries such as Australia, USA, Canada, UK and Russia have been using Numerical Modeling softwares for optimize bench blast designing. However, in Sri Lanka up to now, these methods are not being used. In Sri Lanka, ordinary blasting techniques which are based on past experience are practiced. The outcome of this study shows that bench blasting operations can be optimized by means of JKSimBlast software.