Research On Stability Of Fiber Reinforced Concrete Among Single Layer Tunneling Lining

The dissertation base on the mechanical properties of concrete and steel fiber’sexperiments, through theoretical analysis, model test, numerical simulation and fieldtest, the fiber reinforced concrete lining of tunnel stability of single layer have beenstudied.The main conclusions and achievements are as follows：①Discussed the mechanism of fiber reinforced concrete. The content of fiber’srelationships between flexural strength and impermeability ability; further through thesimulation experiment, studied the radial stress distribution of anchorage range underbolt and lining joint supporting, and the tangential stress distribution.②On the basis of analyzing the classification of the Q system, the creative use ofsurrounding rock loose circle supporting theory to analyze the stability of surroundingrock of single-layer lining tunnel, the index proposed are scientific and comprehensive,and test methods are simple, thus have avaliable application value in actual engineering③Relying on the Guanchangshan tunnel as the basis, through the analysis ofnumerical simulation method, the influence factors of controlling the maximumdisplacement of single layer lining are studied, and is found that the single layer liningsuited for surrounding rock elastic modulus of certain range; the study show that, tocontrol displacement of this engineering tunnel maximum, by increasing the strength oflining is more effective than the increasing of lining thickness.④Through the tunnel construction site tests, the surrounding rock and shotcretecontact pressure, internal stress, grid steel frame main reinforcement stress, axial forceof bolt, surrounding rock pressure and single layer lining of tunnel convergence ofsingle layer lining of deformation are obtained.