Browsing by Author "Sashikala, JRM"

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    item: Thesis-Abstract
    Correlation between standard penetration resistance (SPT N) and cone resistance (Qc) in cone penetration test (CPT) for residual soils
    (2024) Sashikala, JRM; De Silva, LIN
    "Corelation between Standard Penetration Resistance (SPT N) and Cone resistance (qc) in Cone Penetration Test (CPT) for Residual Soils" examines the complex relationship between these two key geotechnical engineering parameters. The basis of the research is a set of in-depth field tests carried out on residual soils, which are remarkable for their specific qualities and common occurrence. This study's main goal is to establish the numerical relationship between SPT N and CPT qc values, which is useful for foundation design and soil characterization. The study begins by providing a thorough analysis of the existing literature of research on the topic, which is followed by a thorough justification of the approach used for the field experiments. Cone Penetration Test (CPT), an appreciated in-situ testing method, is used to quantify qc, and Standard Penetration Test (SPT) is used to compute SPT N values. Statistical techniques are then employed to examine the test findings and determine if SPT N and qc are correlated. The results show that these parameters for residual soils have a high association, which gives geotechnical engineers important information. A correlation between SPT N and qc is then determined by statistically analysing the test data. Geotechnical engineers may learn a great deal from the results, which show a high link between these parameters for residual soils. For the planning and building of foundations on residual soils, the findings have important contributions. Finally, this study has identified a solid framework on further research which can be performed to and emphasizes the importance of comprehending the link between SPT N and qc in residual soils. Key words: standard penetration resistance (SPT N), cone resistance (qc), cone penetration test (CPT), residual soils, correlation
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    item: Conference-Full-text
    Identifying phlogopite mica mineralization in the area around Rathnapura and suggesting suitable mining methods for sustainable exploitation
    (Department of Earth Resources Engineering, 2011-11) Sashikala, JRM; Nishshanka, NAC; Karunarathna, AWKN; Anuradha, HWL; Weerawarnakula, S; Abeysinghe, AMKB; Ratnayake, NP; Abeysinghe, AMKB
    Investigation carried out in the area around Rathnapura shows occurrence of economically valuable phlogopite mica mineralization in the area. Such deposits are concentrated in Hindurangala, Palkumbura, Pathagammana, Yakodiyadeniya, Thambandeniya and Kosgala. Although historical data show systematic underground mining has been carried out in some places, present mining activities are restricted to very small scale pits dug haphazardly. Vein thickness of the phlogopite mica varies from 2 cm - 1 m and extends in N 35°- 50° W direction. They generally follow the foliation pattern of the metamorphic country rocks and three major mineralization zones extending over 10 km have been found in the area. In some locations veins follow joint directions of the area. Variation in physical properties such as colour, expansion and permanent colour changes due to heat are found in the same mineralized zone in different locations.