Three-dimensional Discrete Element Study on Meso-mechanism of Bending Resistance of Steel Fiber Reinforced Shotcrete for Surrounding Rock of Underground Cavern

HE Jun; HUANG Shu-ling; DING Xiu-li; ZHANG Yu-ting; LIU Deng-xue

doi:10.11988/ckyyb.20200883

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Journal of Changjiang River Scientific Research Institute ›› 2020, Vol. 37 ›› Issue (11) : 164-171. DOI: 10.11988/ckyyb.20200883

SURROUNDING ROCK MASS STABILITY OF UNDERGROUND POWERHOUSE OFFENGNING PUMPED STORAGE POWER STATION

Three-dimensional Discrete Element Study on Meso-mechanism of Bending Resistance of Steel Fiber Reinforced Shotcrete for Surrounding Rock of Underground Cavern

HE Jun, HUANG Shu-ling, DING Xiu-li, ZHANG Yu-ting, LIU Deng-xue

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Abstract

The bending resistance of shotcrete is an important reflection of its support strength. Steel fiber reinforced concrete is adopted as the shotcrete for the underground powerhouse of Fengning pumped storage power station. In this study, numerical bending test of the shotcrete is carried out by using 3D discrete element code. During the numerical bending test, a triangulation modeling method based on the Voronoi tessellation is proposed. The Monte-Carlo method was used to establish the random distributed steel fibers, Coulomb-sliding joint constitutive model to represent the linking-breaking effects between concrete mediums, while Cable model to simulate the reinforcement effects of steel fibers. Numerical results are basically consistent with laboratory test curves. The bending failure of the steel fiber reinforced shotcrete is dominated by tensile fractures. The tensile fracture path is generally vertically upward, but is affected by the action of steel fibers. In the process of the bending failure of steel fiber reinforced shotcrete, the yield of steel fibers is mostly due to the yield of the bonding force between steel fibers and concrete, which echoes laboratory tests when many steel fibers are pulled out.

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surrounding rock / shotcrete / steel fiber / 3D discrete element method / bending test / micro failure process / Fengning pumped storage power station

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HE Jun, HUANG Shu-ling, DING Xiu-li, ZHANG Yu-ting, LIU Deng-xue. Three-dimensional Discrete Element Study on Meso-mechanism of Bending Resistance of Steel Fiber Reinforced Shotcrete for Surrounding Rock of Underground Cavern[J]. Journal of Changjiang River Scientific Research Institute. 2020, 37(11): 164-171 https://doi.org/10.11988/ckyyb.20200883

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