ERE - 2010

Permanent URI for this collectionhttp://192.248.9.226/handle/123/18290

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Browsing ERE - 2010 by Subject "Cohesion"

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    Structural mitigation for stabilizing rock slope failure at Peradeniya on Colombo- Kandy Main Road: geotechnical and constructional aspects
    (Department of Earth Resources Engineering, 2010-09) Premathilaka, KKW; Munasinghe, MPNJ; Kasthurirathna, KANS; Kumara, ALDP; Senapathi, LR; Abeysinghe, AMKB; Premasiri, HMR; Chaminda, SP; Puswewala, UGA; Wijewickrama, MIDH; Ratnayake, NP; Abeysinghe, AMKB; Premasiri, HMR; Karunaratne, S
    Rock slope failure at Kandy -Colombo highway near Peradeniya town has been identified as a major threat to the highway as well as the people and properties of the vicinity. This study proposes a permanent mitigation plan for the rock slope failures at this site. Study was initiated with the analysis of similar case studies and field studies on the site area and mitigation options. Two level surveys were carried out to collect topographical data for preparation of a 3D model of the slope. Material identification was done by using particle size analysis and plasticity tests; direct shear tests were carried out to determine the friction angle, cohesion and density of the material. Mitigation plan was designed according to the site conditions. The design was analysed for nine sections on the slope for its stability with the test results by using Geo-studio 2004 software. Reinforcements were proposed to improve the stability whenever needed. An appropriate drainage system was also designed having analysed the past rain fall data of the area. The proposed mitigation plan in this study is a highly stable, safe, trouble-free and economically feasible one, and that can be implemented on this site.
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    Suitability of locally occurring clay as liner material
    (Department of Earth Resources Engineering, 2010-09) Indunil, HWI; Jayasekara, JMNP; Mahesh, TPC; Veenuganan, S; Karunarathne, S; Puswewala, UGA; Ratnayake, NP; Abeysinghe, AMKB; Premasiri, HMR; Karunaratne, S
    The lowest permeability and highest shear strength are desirable factors when designing a liner system. Adding additives such as coal or mixing with fine clays such as kaolin was also invented to improve the desirable properties of the liner. The fundamental soil experiments and tri axial tests were carried to determine the properties of original and mixed clay types. After analyzing, the particle size distributions of clay types, the mixing compositions of additive materials were determined. The compacted mixed clay samples of Bricks and Tile clays from Intermediate zone with kaolin clay to the 70:30 composition gave lowest permeability as 4.591 * 1008 cm/s. The friction angle is important when determining shear strength of liner.The internal friction angle that was improved by adding finely powdered roof tiles (from 12° 10' 8" to 17° 54' 14"). The cohesion between clay particles that was increased by adding lime (from 51.56 Kpa to 54.23 Kpa). Local abandoned clay can be improved as a liner materials.