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Dynamic characteristics of superfine tailings–blast furnace slag backfill featuring filling surface
Highlights The coupling effect of water loss and filling surface on SBB was assessed. The kinetic energy accounted for about 20% of the energy absorbed by SBB in SHPB tests. Splitting of filling surface and inner micro cracks were the main crack types. PBM-SJM coupling model could match the dynamic behavior of SBB containing filling surface.
Abstract Superfine tailings–blast furnace slag backfill (SBB) is prepared by solid waste in mines to fill mined-out voids. SBB reduces the volume of the tailings dam, importantly protecting the environment and building environmentally friendly mines. SBB has two main characteristics: filling surfaces and evaporation of water. Using Split Hopkinson bar tests, digital image correlation, and a high-speed camera, this study mainly examined the coupling effect of water loss and the filling surface and failure mechanism of the specimen containing filling surfaces. The physical tests indicate that the filling surface weakens the strength of SBB. Based on micro observation, the simulation of SBB featuring the filling surface combines two primary contact models in the Particle flow code (PFC), including the traditional parallel bond model and the smooth-joint model, to simulate the formation of inner micro cracks and splitting of the filling surface. The results indicate that PFC models can report the dynamic strength of SBB featuring filling surface and simulate the weakening effect of filling surface on SBB.
Dynamic characteristics of superfine tailings–blast furnace slag backfill featuring filling surface
Highlights The coupling effect of water loss and filling surface on SBB was assessed. The kinetic energy accounted for about 20% of the energy absorbed by SBB in SHPB tests. Splitting of filling surface and inner micro cracks were the main crack types. PBM-SJM coupling model could match the dynamic behavior of SBB containing filling surface.
Abstract Superfine tailings–blast furnace slag backfill (SBB) is prepared by solid waste in mines to fill mined-out voids. SBB reduces the volume of the tailings dam, importantly protecting the environment and building environmentally friendly mines. SBB has two main characteristics: filling surfaces and evaporation of water. Using Split Hopkinson bar tests, digital image correlation, and a high-speed camera, this study mainly examined the coupling effect of water loss and the filling surface and failure mechanism of the specimen containing filling surfaces. The physical tests indicate that the filling surface weakens the strength of SBB. Based on micro observation, the simulation of SBB featuring the filling surface combines two primary contact models in the Particle flow code (PFC), including the traditional parallel bond model and the smooth-joint model, to simulate the formation of inner micro cracks and splitting of the filling surface. The results indicate that PFC models can report the dynamic strength of SBB featuring filling surface and simulate the weakening effect of filling surface on SBB.
Dynamic characteristics of superfine tailings–blast furnace slag backfill featuring filling surface
Liu, Bing (author) / Gao, Yong-Tao (author) / Jin, Ai-Bing (author) / Wang, Xue (author)
2020-01-13
Article (Journal)
Electronic Resource
English
COD , crack opening displacement , CTB , cemented tailings backfill , DIC , digital image correlation , HS , high-speed , MCS , measurement cross section , PFC , particle flow code , SEM , scanning electron microscope , SHPB , split Hopkinson pressure bars , SJM , smooth joint model , SSA , specific surface area , SSCZ , shear strain concentration zone , TSCZ , tensile strain concentration zone , UCS , uniaxial compressive strength , PBM , parallel bond model , QXRD , quantitative X-ray diffraction , SBB , superfine tailings–blast furnace slag backfill , Superfine tailings , Blast furnace slag , Split Hopkinson bars tests , Digital image correlation , Particle flow code , Filling surface
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