Based on the measurement data with the in situ hydraulic fracturing method,it introduces that the analysis of the curve about pressure-time and the characteristics of regional stress state of the target region.And it analyzes that the initial rock stress has potent influence on failure and deformation around openings of tunnel.On the basis of data it could optimize the design of the liner,selection of tunnel section and direction of tunnel axes.

excavation of the existing inverted arch of the tunnel influence very much crucial to the whole structural stability of the tunnel.This text combines construction of water pipe of the Huang Ni chuan tunneling engineering,introduce this project relevant geological conditions and construction crafts,method to adopt the structural stress analyzes system 3D finite element 3D-Sigma.Stability of simulation,this project,employ safety factor to appraise the stability of this tunnel,drawing relevant conclusions,offer reference the rationality construction of the project.

A three-dimensional numerical model has been established by based on some northeastern tunnel construction's geological conditions and engineering features and the distribution of rock mass structural planes using self-developed GeoSMA system.Meanwhile,the tunnel stability analysis provides advices for this tunnel design and construction.