Shear behavior of fiber-reinforced sand composite
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ORIGINAL PAPER
Shear behavior of fiber-reinforced sand composite Asskar Janalizadeh Choobbasti 1 & Saman Soleimani Kutanaei 2 & Moein Ghadakpour 2 Received: 17 March 2017 / Accepted: 1 February 2019 # Saudi Society for Geosciences 2019
Abstract During history, soil was always considered as the cheapest materials, but natural soil exist in site that may not be suitable for construction, and weakness is one of the main faults of soil mechanical characteristics against tension. With purpose of increasing strength and stability of soil particles, nowadays, soils reinforcement method is studying by several researchers. The main purpose of this research is study of effect of using polyvinyl alcohol (PVA) fiber on Babolsar sand behavior. Twelve consolidated drained triaxial (CD) test were conducted on samples with four confining pressures 50, 100, 300, and 500 kPa and three fiber contents (0, 0.5, and 1%). The experimental results indicate that fiber reinforcement improves the mechanical properties of sand. Adding PVA fiber to sand increases maximum shear strength, axial strain at failure point and decrease of strength loss after peak strength. Failure strain and strength increases by increasing confining pressure. Keywords Triaxial test . Fiber . Confining pressure . Reinforced sand
Introduction The main weakness of soil as the main material used in soil structures is low tensile strength of these materials (Tavakoli and Kutanaei 2015; Choobbasti and Kutanaei 2017a; Kutanaei and Choobbasti 2017). When soil and reinforcement element are mixed, the produced composite materials has proper compressive and tensile strength in which reinforcement elements with tensile strength are inserted in to soil structure as a reinforce element (Rezaei et al. 2015; Choobbasti and Kutanaei 2017b; Anvari et al. 2017). Soil reinforcement is one of the branches of geotechnical that employs proper materials for reinforcing soil by using scientific principles and new method and improves engineering characteristics and mechanical properties such as strength, stiffness or elastic modulus, ductility, and bearing capacity (Pakar and Editorial handling: David Giles * Asskar Janalizadeh Choobbasti [email protected] * Saman Soleimani Kutanaei [email protected] 1
Department of Civil Engineering, Babol Noshirvani University of Technology, P.O. Box 484, Babol, Iran
2
Department of Civil Engineering, Babol Noshirvani University of Technology, P.O. Box 484, Babol, Iran
Bayat 2011; Bayat et al. 2014, 2015, 2016; Pakar et al. 2014; Bayat and Bayat 2014; Bayat and Pakar 2012, 2013a, b; Kutanaei and Choobbasti 2016a; Mashhadban et al. 2016a). The time for the first efforts to reinforce the soil is unknown (Bayat and Abdollahzade 2011; Edalati et al. 2016; Sarokolayi et al. 2015, 2016; Kutanaei and Choobbasti 2016b). More than 3000 years ago, Babylonian used reinforced earth for building ziggurats that in ancient Babylonian architecture was told tall tower (Choobbasti et al. 2015; Kutanaei and Choobbasti 2015a). About 2500 years, men putting bran
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