Displacement response characteristics of different sand tunnel excavation faces under true triaxial loading

During the construction of subway tunnels, geotechnical body is affected by excavation to produce three-dimensional spatial deformation. The deformation bodies an important safety hazard for project advancement, so it understand disturbance range and mechanism. current related research mainly about theory land subsidence two-dimensional plane displacement stratum, there are few studies on specific mode its In order better characteristics tunnel soil, a model test was established based true triaxial stress loading system combined with scanning technology superimposed sandy soil. Based model, vector response face were studied in main area around face. Meanwhile, characteristics, such as vertical settlement horizontal stratum influence analyzed. results show that elliptical distributed within twice diameter axis. bell-shaped direction inverted wedge-shaped direction. space presents “W” distribution. theoretical this paper can provide some references engineering sand-soil tunnels.