This book introduces shield construction risks under mixed face ground condition, analyzes the shield tunneling risks, gives definitions of relevant risks and creates the theoretical system of shield tunneling technology under mixed face ground condition, that is,  geology is the foundation, TBM is the key, and people (management) is the essence. The content provides numbers of targeted solutions, such as dual-mode TBM, multi-mode TBM, millisecond delay blasting for boulders, Paste HDN, auxiliary pressure balance tunneling and so on. This book can make researchers who engaged in shield tunneling to get experiences and lessons from it, so as to make the right decision during shield type selection, standardize shield tunneling, take proper action, avoid or reduce construction risks, and minimize casualties and property losses.

Weibin ZHU, special allowance expert of the State Council, visiting professor of Hehai University and Guangzhou University, chief expert of Shield Technology Institute of Guangzhou Metro, chairman of the Special Committee of Engineering Cases of the Chinese Society for Rock Mechanics and Engineering. He has founded the shield tunneling technology system in mixed face ground conditions, published more than 100 professional papers, 10 patents and 20 books, and mainly engaged in shield tunneling technology research and metro construction management. Shijian JU, a part time professor of China University of Mining and Technology and expert consultant of Guangzhou Metro Design Institute. Before retirement he has been the shield section director in the early construction period of Guangzhou metro line 1 and line 2. He has published over 4 professional books. In recent ten years he has been engaged in research works of shield engineering construction technology. Hui WANG, engaged in rail transit engineering supervision, project management, engineering consulting fields for more than 25 years and was bestowed Guangdong municipal industry excellent general engineer, excellent director and other titles. He has published over 5professional books and his current research interests include engineering management, construction risks prevention and control as well as construction technology. 

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.