Abstract: When the tunnel passes through a rock mass intrusion zone, the tunnel excavation or unloading at the slope side may break its original equilibrium state, and the stability safety will often be reduced. The reduction in the stability might induce the slip or creep in the rock mass intrusion zone that triggering the safety of construction project and operation. By monitoring the deep horizontal displacement in the rock mass intrusion zone can effectively provide a safe excavation construction.  This paper presents the geological conditions and field engineering conditions of the rock mass intrusion zone, the layout method and related principles of automatic monitoring of horizontal displacement in the rock mass.

Key words: Rock Mass Intrusions, Deep Horizontal Displacement, Automatic Monitoring