The Deformation Mechanism And Deformation Control Of Karst Tunnel With Large Buried Depth And Breccia Soft Rock

In recent years,in order to make full use of underground space,the construction of the tunnel across the country is developing rapidly while tunnel research encounters more and more challenges,including large buried depth study of soft rock tunnel which becomes a worldwide research subject.Based on GangWu tunnel D1K878+035~D1K877+985 as the research background,this paper combines with the actual engineering situation,had conducted a study about deformation mechanism and deformation control of the karst tunnel of big buried deep and breccia soft rock.(1)With the description of the problems existing in the construction process,it analyzes preliminarily the reason causing of disease emergence.By the way of software of ANSYS and FLAC3 D,it establishes two steps and three steps excavation model of design changes before,analyzing its deformation mechanism,and at the same time,proving the reason causing of engineering disease.(2)In order to control the deformation of the surrounding rock and supporting structure,tunnel design has carried on the corresponding change.Through the software,the design changes of model is established by software.According to the regulations of design reinforcement measures on the the tunnel deformation control,it analyzes the breccia soft rock control effect of big buried and deep karst tunnel and providing the basis for construction safety.(3)In order to validate the correctness and reliability of the numerical simulation results,collecting data and installing the instrument,to monitor the corresponding cross section measurement,and analyze the stability of monitoring results,and verify its correctness of the reliability,the related parameters of calculation model and the safety of construction.