Risk Management For Tunnelling In Extreme Geological Conditions In Hong Kong
This paper draws from experience gained from a series of risk assessments and on site managements of such risks from recently completed, major rock tunnel projects in Hong Kong. The following projects are selected to identify a variety of adverse geological hazards encountered by a range of rock tunnelling methods: 1. Kowloon Southern Link – TBM excavation using slurry for tunnelling in extreme mixed face conditions below Kowloon Peninsular; 2. Eagles Nest Highway Tunnel - Drill and blast excavation of 18 – 20m span rock tunnels with low rock cover and mixed face conditions at portals requiring pre-support and heavy support; 3. Tai Po potable water aqueduct - 12kms of TBM rock tunnel with steel liner, excavated at 700m depth in hard volcanic and granitic rocks with high water inflows. A state of the art Risk Management Plan and Matrix was employed for the first two of these projects. Key geological risks successfully managed during construction of all three tunnelling works are presented together with the appropriate mitigation measures adopted in order to maintain effective control of the works. Back analysis of costs of tunnelling in different IMS rock classes are presented to demonstrate the importance of geological conditions on cost and programme.
Ian McFeat-Smith
IMS Tunnel Consultancy Ltd, Hong Kong
国际会议
香港
英文
1-5
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）