This report is produced in response to a series of incidents of ground instability and collapse that have occurred on recent tunnelling projects in suburban and city centre environments on which closed-face tunnelling machines were used.
The purpose of this report is to examine the potential for ground instability or collapse when using closed face tunnelling machines, to investigate the efficacy of various ground investigation techniques in urban areas, and to recommend management and operational guidelines to further minimise the risk when tunnelling beneath highly developed urban and
city centre areas.
Chapter 1 : Technology of Closed-Face Tunnelling Machines
Chapter 2 : Choosing Between Earth Pressure Balance Machines (EPBMS) and Slurry Tunnelling Machines (STMS)
Chapter 3 : Incident Data
Chapter 4 : Hazards Associated with Urban Tunnelling
Chapter 5 : Use of Risk Management
Chapter 6 : Review of Site Investigation Method
Chapter 7 : Tunnelling Process : Construction
Chapter 8 : Tunnelling Process : Monitoring, Recording and Reviewing
