ISSN 1062-7391, Journal of Mining Science, 2017, Vol. 53, No. 2, pp. 239–252. © Pleiades Publishing, Ltd., 2017. 239 _________________________________ GEOMECHANICS _______________________________ ____________________________________________________________________________________________________________________________________ ___________________________________________________________________________________________________________________________ Modeling Fiber Reinforced Polymer (FRP) Coating in Retrofitting Concrete Walls against Explosive Loads 1 Hadi Haeri a *, Mohsen Farazmand b , Vahab Sarfarazi c , and Zheming Zhu d a Young Researchers and Elite Club, Bafgh Branch, Islamic Azad University, Bafgh, Iran *e-mail: h.haeri@bafgh-iau.ac.ir; haerihadi@gmail.com b Department of Mining Engineering, Bafgh Branch, Islamic Azad University, Bafgh, Iran c Department of Mining Engineering, Hamedan University of Technology, Hamedan, Iran d College of Architecture and Environment, Sichuan University, Chengdu 610065, China Received January 31, 2017 Abstract—One of the issues considered in the design and dynamic resistance of structures (as seismic or explosive) is the use of materials which cause reduction in the force applied on the structure. With regard to the fact that greater loading is on the wall of concrete structures, the use of materials that reduce explosive force on the structure wall are among explosive force reduction methods.One of the viscose and damping materials of polymers is FRP, and in this study the FLAC3D software is used to evaluate the effect of this material on reducing force implemented on the walls and hence reduction of wall movement due to explosion. The concrete wall along with the FRP layer is modeled under dynamic loading. The effect of damping coefficient, number of FRP layers and concrete wall thickness has been evaluated. Keywords: Dynamic load, explosion, FLAC3D, FRP. DOI: 10.1134/S1062739117022079 INTRODUCTION In order to carry out another study on the resistance and dynamic behavior of mixed concrete reinforced with polymer coating, previous attempts have been studied [1–15]. This review is focused on previous studies on concrete material under various loading conditions. Whereas the study of the rupture mechanism of compound materials such as samples of reinforced crisp concrete with polymer coating is of great significance, comprehensive studies on the dynamic behavior of these compound materials can provide good recognition of the stability of concrete structures with polymer coating and result in the safe and economic design of engineering projects [11–15]. The applications of polymer coatings, which are considered secondary restraints, include aerospace and marine engineering, military equipment for producing electricity, waste filtration, chemical sites, pipelines and reservoir facilities. Also, in order to increase the lifetime of concrete structures, floors and various underground infrastructure facilities can make use of polymer coating. Polymer coating as an infrastructure or bed is usually used for steel or concrete. Even though the protection of composite or ceramic structures has recently been of utmost importance, composite materials are being used in projects related to explosives and shootings, in which this material is effective in the absorption of energy resulting from explosion [15–21]. Elastomeric polymers such as FRP, have extensive applications as reinforcement for absorbing the energy of material for structures and systems under the influence of impact loading. The use of FRP coating in composite material such as concrete as a shock reducing material is a relatively new method. Understanding the dynamic behavior of this material for its use as protection and reinforcement is effective and necessary. This coating can also 1 The article is published in the original.