Analysis Of Structure Stress And Deformation In Fault Fracture Zone Of Yaozhai Tunnel

In recent years, with the continuous development of highway construction in our country, the tunnelproject has already developed into long and deep-depth direction, constructing of the long tunnel project ofgoing across the geological conditions in the fault fracture zone has been increasing. In process of faultfracture zone tunnel construction, there often happened of deformation caused by tunnel section extrudedthe surface, steel arch shelf in serious distortion, obvious cracking of concrete spalling, secondary lining ofconcrete cracking and other construction disasters. Therefore, the research of the fault fracture zone in thetunnel structure stress is particularly important.This thesis is based on tunnel project of region for ’Yao’ people, analysising and researching the faultfracture zone of tunnel surrounding rock, structure stress and deformation characteristics.At first, by choosing typical sections, burying pressure cells, rebar indicator, surface strains, concretestrain gauge and other test components to measure the structure of surrounding rock stress, analysis of testdata. Come to the conclusion of the force characteristic of tunnel surrounding rock and supporting systemand as a whole tunnel under load ratio of primary support and secondary lining.Secondly, using numerical simulation to compare three kinds of tunnel excavation method for faultfracture zone of surrounding rock, the two steps method, three steps method, up and down the stepsreserve core method, from the aspects of vertical displacement and horizontal convergence then to selectthe relatively reasonable construction methods for the fault fracture zone.Finally, using up and down the steps reserve core method for numerical simulation of excavation, todraw a conclusion of structure of surrounding rock stress and the distribution characteristics, analysis ofsimulation results, compared with the measured results on the spot, on this account to study the faultfracture zone caused by tunnel construction in the condition of each part of the surrounding rock andlining structure stress distribution and deformation characteristics.