Research on bearing capacity of U-shape steel frame under the influence of fault

KAN Jiaguang; ZHANG Nong; LIU Ningning; YANG Sen; LIANG Dongxu

Abstract：In order to analyze the bearing capacity of U-shape steel frame under the influence of fault,based on the parameters of the fault and eccentric load of U-shape steel frame,the return airways of No.6 coal in north 1 (6-2) raise panel in Gubei was taken as an engineering example.By utilizing in situ investigation,numerical simulation,and industrial experiment,the bearing capacity of U-shape steel frame under different normal distance,dips and location of the fault were studied.The results show that with the increasing of the normal distance,the maximum bending moment on the support appeared successively at the left shoulder angle and left side,and then appeared at the two sides of the roadway.When the normal distance between the roadway and the fault is 5 m,the bending moment reached the maximum value 3.664 MN · m.When the dip is 45° and 60°,the minimum and maximum bending moment values reached respectively.When the fault was located in the roof of the roadway,the bending moment of the support reaches the minimum value 0.193 MN · m.The nearer the fault was to the bottom,the more unfavorable for bearing capacity.Compared with booth lag,roof beam was less affected by the variation of fault location.The support had stronger resistance to roof pressure.It was conductive to the overall bearing capacity when the ratio of eccentric load on vault to uniform load was 1.0 2.0.Eccentric load on spandrel was the worst for support.With the increase of bolts,the bear ing capacity of support decreases when the eccentric load on vault is low.