Discussion on design parameters and methods of steel fiber reinforced concrete wall seat in deep freezing shaft linings
LU Junjie
YAO Zhishu
WANG Jiaqi
SHI Changsheng
Abstract：In order to solve the problems of difficult selection of design and calculation parameters of steel fiber reinforced concrete wall seat of deep and large frozen shafts,relevant research was carried out with the auxiliary shaft of Subuerga Coal Mine as the engineering background.The mechanical properties of steel fiber reinforced concrete and benchmark concrete show that the shear strength,splitting tensile strength and compressive strength of steel fiber reinforced concrete are increased by 22.64％～46.56％,32.45％～34.51％and 0.70％～1.65％,respectively.Referring to the current design code for concrete structures,the standard values and design values of the shear,compressive and tensile strength of CF60～CF80 steel fiber reinforced concrete are obtained.Based on the current design method of the overall bearing capacity of the borehole structure,an optimization method for the design of the wall seat is proposed.The results show that the method is not only feasible,but also the values of the relevant parameters are well documented,which makes the design and calculation of the steel fiber wall seat of the deep and large frozen wellbore more scientific and reasonable.
Keywords：freezing shaftsteel fiber reinforced concretewall seatshear strengthdesign optimization method
Publication Date：2025-12-31
Online Publishing Date：2025-11-25(First online date of this platform, not the publication date of the document)
Pages：7( 29-35 )