Mixed Face Condition and Combined TBMs -- Creation of Tunneling Principle in Mixed Face Condition -- Risk Assessment of Shield Tunneling -- Geological Survey and Alignment Optimization -- General Configuration of Combined TBMs -- Main Configuration of Earth Pressure Balance TBM -- Slurry Circulation of Slurry TBM -- Multi-mode TBM -- Tunneling with Large-diameter TBM -- Formation Mechanism and Disposal Technologies of Discharge Stagnation, Clogging and Water -- Risks and Disposal Technologies for Boulder -- Shield Tunneling under Karst Condition -- Protection of Surface Buildings and Disposal Technologies of Sub-surface Artificial Obstacles -- Auxiliary Tunneling Technologies by using Pressurized Air -- TBM Tunneling Technologies through Excavated Tunnel Section -- Technologies of Shield Tunneling along Special Alignment -- Technologies for Hyperbaric Intervention in Excavation Chamber.