A Comparative Study on Shear Strength and Deformation Behaviour of Clayey and Sandy Soils Reinforced with Glass Fibre
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ORIGINAL PAPER
A Comparative Study on Shear Strength and Deformation Behaviour of Clayey and Sandy Soils Reinforced with Glass Fibre Suchit Kumar Patel
. Baleshwar Singh
Received: 31 December 2019 / Accepted: 27 April 2020 Ó Springer Nature Switzerland AG 2020
Abstract In this investigation, the shear strength and specimen deformation behaviour of glass fibre-reinforced clayey and sandy soils have been compared based on the results of consolidated undrained and consolidated drained triaxial tests, respectively under varying moulded states. The clayey soil specimens were moulded with varying dry unit weight, whereas sandy soil specimens were moulded at relative densities ranging from 35 to 85%. For any moulded state, no peak is noted in the stress–strain curves of reinforced clayey soil up to 20% axial strain. In case of the reinforced sandy soil, clear peak is observed well before 20% axial strain with post-peak stress reduction at all relative densities. Reinforced clayey soil shows bulging at all dry unit weights. For the reinforced sandy soil, bulging failure is noted at 35% relative density, whereas shear failure occurs at relative densities of 65% and 85%. At all dry unit weights, under undrained condition, the reinforced clayey soil exhibits only positive pore water pressure indicating contractive behaviour at all axial strains.
S. K. Patel (&) Department of Transport Science and Technology, Central University of Jharkhand, Ranchi, Jharkhand 835205, India e-mail: [email protected] B. Singh Department of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India e-mail: [email protected]
Under drained condition, the reinforced sandy soil of 35% relative density shows contractive behaviour, while the specimens of 65% and 85% relative densities indicate contractive response at smaller axial strain followed by dilative behaviour at higher strain. The increase of shear strength is up to 0.75% and 3% fibre content in the clayey and sandy soils, respectively irrespective of moulded states. At respective optimum fibre reinforcements, the benefit of glass fibre reinforcement is greater for the sandy soil. The possible environmental impact and field application of glass fibre-reinforced soil have also been discussed. Keywords Glass fibre Dry unit weight Relative density Shear strength Failure mode List of Symbols B Foundation width FC Fibre contribution OMC Optimum moisture content MDU Maximum dry unit weight Cu Coefficient of uniformity Cc Coefficient of curvature D Foundation depth Dr Relative density ESP Effective stress path H Height of earth retaining structure Ka Active earth pressure coefficient Nc, Nqand Nc Bearing capacity factors Q Ultimate bearing capacity
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Geotech Geol Eng
q Pa p p0 fc RGF SEM TSP W Wf Ws V r10 r30 Dr /0 c0 c cd Du
Deviator stress Lateral earth pressure Total mean stress Effective mean stress Fibre content Recycled glass fibre Scanning electron microscopy Total stress path Total weigh
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